Abstract
Current industrial operations pollute the world’s land, water, and air with heavy metals. Metals’ environmental behaviour and geographical distribution near the industrial production. Heavy metal contamination potential was assessed using geoaccumulation index, enrichment factor, and other criteria. Heavy metal concentrations have increased due to industrial waste, geochemical shifts, agriculture, and mining. Modifying cell structure, heavy metals can harm and cause cancer. We need to develop and conduct comprehensive monitoring to determine if industrial production and mining is causing elevated heavy metal levels nearby area in the zone. This review shares contemporary heavy metal contamination on its nature, origin, and extent.
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1 Introduction
Increased industrialization, exploitation of natural and mineral resources, and unsustainable societal behaviours have resulted in widespread environmental degradation on a global scale. Polluting the environment and subsoil pollution is a result of the direct disposal of urban and industrial pollutants into pits dug in the ground [1,2,3]. Water pollution has emerged as a major concern due to the importance of having access to clean drinking water for both the environment and human well-being [3,4,5,6]. Heavy metals from rapid industrialization and urbanisation have accumulated in urban soil, water, sediment, roadway dust, and creatures [7,8,9]. The toxicity and perceived permanency of heavy metal contaminations in the environment have sparked growing concern [10, 11]. High concentrations of these indestructible and non-biodegradable metals are hazardous to all forms of life. Cadmium (Cd), Chromium (Cr), Lead (Pb), Zinc (Zn), Iron (Fe) and Copper (Cu) are common heavy metals to potential dangers and occurrences in polluted soils [3,4,5,6,7,8,9,10,11,12]. Heavy metals may accumulate to dangerous concentrations under specific environmental conditions, causing ecological damage [13,14,15]. Several indices have been established over the past few decades to evaluate geochemical accumulation and pollution intensities in soil and sediment [16, 17]. Most of the indices evaluate soil buildup or contamination relative to some standard metal content. Soil erosion, the greenhouse effect, and heavy metal contamination are only some of the environmental problems that have resulted from agriculture's excessive use of its resources. Heavy metal contamination of agricultural soils has long been recognised as a major problem in this field [18].
Air, noise, and water pollution are the principal environmental pollutants. Point and non-point water pollution exist. Factory, sewage, power plant, underground coalmine, and oil well water pollution sources may be monitored and tracked. Non-point sources, on the other hand, arise from many contaminating activities that are hard to control. Non-point sources include storm water drainage from lawns, parking lots, streets, etc. that ultimately reaches major water sources, agricultural runoff of fertilisers from farm animals and crop land, urban runoffs, air pollutants washed or deposited to earth, and so on. Similarly, the main cause of air pollution is fossil fuel burning which emit sulphur dioxide and particulates. Ozone is produced in the troposphere by nitrogen oxides and organic vapours reacting with sunlight [19].
Urban regions have considerable environmental pollution due to the large number of pollutants and polluted. Air pollution causes illness, pain, and cognitive and physical decline. Urban air pollution may harm children and immunocompromised individuals. Urban air pollution harms buildings and materials, increasing maintenance costs and reducing aesthetics. Human health is harmed by water pollution. The water dilemma involves groundwater contamination. Groundwater provides drinking water in many areas. The upper soil layers of the aquifers cleaned the groundwater. Surface storage facilities, particularly those that leak trash or large volumes of liquids like gasoline, contaminate groundwater. Earth's chemical waste pollutes subsurface water. Fertilizer and pesticide leaching harms groundwater. Human Development Index (HDI) Report (2011) outlines research technique that loss of 8% from the baseline would be "environmental disaster" with the biggest drops in South Asia and Sub-Saharan Africa. Climate change affects agriculture, clean water and pollution, making it a ‘‘environmental issue’’. From mining and processing raw materials to assembling and delivering finished goods, manufacturing worsens environmental circumstances. Manufacturing energy generation, agricultural and forestry production, and others may be divided down into even more pollution-causing subsectors. Consumption, which includes residential, commercial, and societal usage of manufacturing products, pollutes second only to production. Thus, production and consumption cause pollution. Not all manufacturing and consumption waste was recycled, polluting the environment.
National long-term policy themes require the commitment of society and decision-makers to strengthen and apply strategies to check the pollution. As such country where without check or strict impose of law the fresh water is being highly polluted i.e. Romania is poor in freshwater resources (Europe ranked13th) and is dependent on precipitation. Climate warming leads to decreased river runoff due to increasing air temperature, which, in turn, accelerates evapotranspiration [20].
2 Metals that are toxic found in the water supply
Heavy metals (HMs) are often distributed unevenly between the water and the sediments of the riverbed. To what extent metals are transported across the sediment–water interface depends on the physical and chemical properties of the water as well as the sediment. The accumulation of HMs in river environments leads to harmful amounts that biota can absorb because these contaminants are neither biodegradable nor thermodegradable [21]. Extreme hydrometeorology provides a window into the ever-changing balance between HMs in sediments and water flow. River flows are rising due to climate change, which is washing silt from riverbeds into the higher reaches of rivers. Because of this, the composition and quality of the water can be altered over time by pollution deposits that are buried deep underground [22, 23].
The increasing number of megacities, together with urbanization's other effects such as population increase and migration, provide a problem for clean water supplies [24]. Emerging concerns to the supply of safe drinking water pose serious dangers to human health and have broad public health implications [25, 26]. Polluted urban waters affect the quality of drinking water and pose a threat to urban residents since these metal contaminants are carried throughout the city via the air, surface runoffs, and groundwater flow [25]. The correct methods and equipment can be used to control water contamination from point sources such factories, sewage systems, power plants, underground coalmines, and oil wells.
Heavy metal contamination surrounding mines can range from mild to severe, depending on factors including mineralization of tailings and geochemical properties. Generation of millions of tons of sulfide-rich tailings by opencast mining activities has a significant negative effect on soils and water streams, according to [27,28,29]. There is a high probability that wind and water will distribute, incorporate into particle matter, or dissolve trace elements in mining and metallurgical waste following disposal. When the transportation process was on then the pollution can arise from three sources: primary contamination, which is caused by residues near the sources of contamination; secondary contamination, which occurs when trace elements spread out from their production areas through water and wind and tertiary contamination, which signifies the mobilization of trace elements [30, 31].
Heavy metals can enter the aquatic environment in one of two ways: naturally or artificially. Indirect channels include dry and wet deposition and land run-off in addition to direct discharges into fresh and marine habitats [32]. Significant natural sources also come from forest fires, continental weathering, and volcanic activity. Either high, intermittent emissions from explosive volcanism or low, continuous emissions from processes like geothermal heat flow or magma degassing can be attributed to volcanic activity [32]. Groundwater contamination is a major environmental issue. Groundwater has always been safe to drink because the land above the aquifer filters it. Surface leaks from trash or bulk liquid storage (like gasoline) are the main source of groundwater contamination. Chemical wastes dumped on the ground may contaminate the underlying groundwater over time. The pollution of groundwater is also worsened by the leaching of fertilisers and pesticides from the agriculture sector too [33].
3 Root cause: soil contamination from heavy metals
High heavy metal content in soils is related to the latter’s geo- and bioaccumulation ability [34] as well as the transport rate within the soil profile [35]. Distribution of heavy metals within the soil profile could provide information about their origin [36, 37]. Soil enrichment with heavy metals could reflect historical human activities [38,39,40,41]. The present anthropogenic pollution sources, such as industry and agriculture, have an undoubted influence on heavy metal accumulation in the soil [42,43,44]. Heavy metals can be derived from both local and distant sources of emissions, and therefore can be deposited in situ or due to their ability to be bound by dust can be transported over long distances [38, 45]. Most anthropogenic pollutants are emitted into the atmosphere and then are deposited on the soil surface [46, 47]. Heavy metals are considered substantial constituents of the Earth’s crust [48, 49] hence, the nature of the parent material and pedogenesis at the site can create favourable or unfavourable conditions for heavy metal accumulation. Furthermore, weathering of the parent material is a natural process affecting the number of heavy metals in the soil [36, 50]. The problem of high concentrations of heavy metals, especially in agricultural soils, creates a global environmental issue due to the crucial importance of food production and security [26, 36, 51]. Incorporation of heavy metals into the trophic chain may affect animal and human health [26, 52, 53].
Growing awareness of ever-expanding industrialization as well as intensive agricultural soil use and their influence on the content of heavy metals in the soil necessitates the appropriate evaluation as well as determination of their ecological risk [54, 55]. Heavy metal pollution is visible in urban centres and farmland located in the vicinity of pollution sources [20, 52]. Analysis of studies of time trends of heavy metal content in soils allows the tracing back of the development of industrialization as well as the use of fertilizers in the last decades. Numerous geochemical studies have contributed to the creation of an extensive database of heavy metal background values that can now be used for the evaluation of environmental quality [56, 57]. However, analysis of the total contents of heavy metals in the soil may not always be a sufficient method of assessment [55, 58]. The key to the effective assessment of soil contamination with heavy metals lies in the use of pollution indices.
4 Evaluation of heavy metal using a range of parameters
Heavy metals in soil can be measured using pollution indices which was developed one of the earliest indices [17]. For a thorough geochemical assessment of the soil environment, pollution indices can be used as a tool and guidance [2, 38, 55]. In order to determine soil pollution indices, it is necessary to first evaluate the soil's geochemical context (GB). Soil heavy metal concentration is a term that was coined to differentiate between normal and excessive levels of heavy metals in the ground [48, 59]. Based on [60,61,62] stated that GB "is a relative metric to discern between natural element or compound concentrations and anthropogenically-influenced concentrations in a given environmental sample." The ability to evaluate environmental risk and the level of soil deterioration is further evidence of the all-encompassing nature of measuring soil quality using indices [60]. These indexes are useful for distinguishing between heavy metal accumulations attributable to natural processes and those attributable to human activity [58, 63]. In the case of agro-ecosystems in particular, it is crucial to keep an eye on soil quality and the pollution indices that measure it [47]. Physical properties (texture, structure, and porosity), chemical properties (fixed residues, petroleum products, extractible substances in organic solvents, and heavy metals) and specific soil quality indicators (active and potential pH, total organic carbon TOC, oil compounds, extractible substances in organic solvents, and heavy metals) are the four groups into which the various parameters used to assess soil quality can be sorted.
5 Measures of air, water and soil contamination
Heavy metal contamination can be evaluated using a number of different approaches and criteria [64]. The enrichment factor (EF), contamination factor (CF), Geo-accumulation index (Igeo), and pollution load index (PLI) are among the identified environmental pollution factors can used for measurement.
5.1 Selected indices and overall analysis
Indicators of pollution can be split into two categories from a modelling standpoint: single-indicator indices and composite indices [58]. Enrichment factor (EF), contamination factor (CF), contamination degree (CD), pollution load index (PLI), metal pollution index (MPI), and geo accumulation index (I-geo) are all indices for quantifying soil contamination. Many authors choose to express the metal contamination relative to the average shale when attempting to estimate the level of pollution (Table 1).
5.2 Degree of Enrichment factor (EF)
In scientific studies, the amount of an element's or compound's enrichment over its background concentration is evaluated using a metric called the Enrichment Factor. The EF was developed by researchers [66] is widely used to quantify the effects of human activity on sediments and soils. Sample concentrations are compared to background concentrations of the same element in non-polluted locations to determine this factor [64, 66, 67]. In order to evaluate natural or anthropogenic sources of heavy metal content in samples, an enrichment factor is calculated as follows:
where “El” refers to the element under consideration, the square brackets indicate concentrations (usually in mass/ mass units, such as mg/kg), and “X” is selected reference element. Crust subscription in Eq. 1 refer to Clarke of Earth’s crust, most often Continental.
5.3 Contamination Factor (CF)
Contamination factor is an indicator of soil and sediment heavy metals contamination ratio and is obtained by dividing the concentration of the element in the sample taken by the concentration of the same element in the background [64, 68].
where “C” sample is the concentration of an element in the sample and C background is the concentration of the element in global shale. If CF is higher than 1, indicating the increased concentration of pollutant due to human factors.
5.4 Geoaccumulation index
According to research, geoaccumulation index was first introduced by Muller and was initially named as the Muller index [64, 69]. The Muller index is used to measure the amount of contamination with heavy metals in the soil. This assessment index was used in soil and sediment contamination studies [70, 71]. Geoaccumulation index is used for classification of soils, from non-contaminated to heavily contaminate and is calculated using the following formula [71]:
In Eq. 3, Cn is the measured concentration of the element in the collected sample and Bn represents the concentration of the element in the background sample. The coefficient of 1.5 is used to eliminate possible changes in the background due to the geological effects.
5.5 Pollution load index (PLI)
Soil and sediment pollution is commonly assessed using pollution load index. This index calculates the coefficient of each soil element by dividing its concentration by its concentration [72]. Therefore, PLI may be determined for a collection of contaminating metals as the geometric mean of all metal concentrations. PLI readings above 1 indicate soil contamination, while those close to 1 suggest background concentration [72]. The total heavy metal contamination in the region is obtained using this indicator, and by Eq. 4:
Soil pollution caused by certain heavy metals can be evaluated with the help of the instruments included in the separate indices group (Table 2). Different pollution indicators are more or less applicable for certain types of soil uses [38, 57, 73]. Pollution indices can be used to get a sense of how bad things are at a certain location, but picking the right one depends on factors like how dangerous it would be to use it [36, 53, 55, 74]. Environmental management is aided by knowing how polluted farmland soils are [51, 75, 76]. Protecting precious ecosystems and limiting human exposure to harmful substances requires an understanding of soil pollution [77]. Soil and groundwater are enriched with heavy metals due to widespread agricultural practices [75, 78]. Since EF may pinpoint the origin of contamination, it is recommended that it be included in the set of individual pollution indices used to evaluate agricultural soils [55]. Complex pollution indices are also useful for gauging the level of pollution in an area and estimating the possible ecological danger [36, 52, 56].
5.6 Combined pollution index (PI) based on production and consumption
The Pollution Index (PI) is the sum of two sub-indices, Production and Consumption. Pollution from both production and consumption will be factored into a composite index. Symbolically,
where I and t indicate countries and time as stated before;\({PI}_{it}\) = Combined pollution index
\({PI}_{it}^{P}\) = Production based pollution Index; \({PI}_{it}^{C}\)=Consumption based pollution Index;
5.7 Ecological risk assessment
Several variables, including the correction factor for the metal, ecological risk factors, and toxicological response factors, are accounted for in the calculation of the risk index (RI) (Tables 2, 3). For instance, Zn and Mn both have a value of 1, while Cr has a value of 2. According to [79], Co, Cu, and Ni are all given a value of 5, whereas Cd is given a value of 30. The RI is calculated by taking into account a number of elements, such as the toxicological response factor (Tri) of each element as published by [79], the contamination factor (CFi) of each metal, and possible ecological risk factor (Eir) associated with each metal [64]. The RI or modified risk index (MRI), shorthand for the prospective and modified ecological risk index grades, is a measure of the danger posed by a specific ecological situation. When the enrichment factor (EF) is used, an index is calculated that measures the possible ecological danger to the environment; this index is called the modified risk index. In order to compute MRI, we must first determine both the modified potential ecological risk factor (mEir) and EF for each metal. The equation for calculating the RI as proposed by [80] Hakanson (1980) is presented below:
where “Er”.
\(Er=\sum_{i=1}^{n}{Tr}^{i}\times {Cf}^{i}\), is the Ecological risk index potential of a certain element, Tri is the individual element's biological toxicity response factor and Cf i the contamination factor refers to the level of contamination for each individual constituent.
6 Sources of environmental pollution
Energy is a key factor in achieving sustainable development. When using non-renewable resources, the energy generation process can produce substantial pollution. This happens frequently in third-world countries. The appropriate interpretation of soil conditions is aided by the identification or construction of a sound theoretical framework that may be computed using indices that reflect varied attributes. Sustainable development risk is greatly influenced by environmental pollution. It’s possible that the causes of environmental degradation, and the degrees to which they manifest, vary across economically developed and economically developing countries. Risk variables that contribute to a rise or decrease in environmental pollution, and their interrelationships, must be analysed in the context of environmental pollution risk management. To a large extent, pollution may be traced back to the production process, which includes everything from the mining of raw materials to the distribution of finished items. Manufacturing, electricity generation, transportation (road, rail, and air), agriculture, and forestry are all primary production sectors that contribute to environmental pollution. Numerous industries and sub-industries exist within each of these broad categories. The second major contributor to environmental degradation is the domestic, commercial, and societal use of manufactured products (Table 3). As a result, the manufacturing, distribution, retail, and service sectors all add to pollution levels [26].
7 Global pollution index assessment of economic activities and environmental impact
The development of effective policies that aim to mitigate negative impacts and maximize positive ones has been aided by the creation of integrated or strategic impact assessment techniques in economic, environmental, and social domains [81, 82] lend credence to the claim. The cumulative environmental implications of a proposed action can be evaluated with the help of tools for Cumulative Impact Assessment (CIA) [83], which take into account the past, present, and future activities. The potential effects of new endeavours or ongoing commercial operations on the natural environment must be evaluated, and this requires following a structured environmental assessment method. It is generally accepted that the CIA plays a crucial role in environmental planning. However, details on environmental state regulations, administrative processes, and criteria for assessing cumulative consequences are scant. Scales, baselines, notable criteria, and coordination protocols were often used in CIA investigations. Romania relies on the International Pollution Index (IGP) as its primary tool for assessing environmental impacts. This index can be used to evaluate the overall effects on the environment. Collecting data on the technological process, economic and social needs, air emissions, water resources, soil, and noise levels at the analysed area is a crucial part of the approach. The procedure also includes anticipatory thought and identification of potential outcomes, as well as impact evaluation at a comparable scale using the worldwide pollution index as an alternative methodology. This generalization holds true for any approach used to calculate the sum of an environment's influences [84,85,86].
One of the primary factors contributing to the deterioration of the health of the population is air pollution. The polycyclic aromatic hydrocarbons (PAHs) that are found in particulate matter (PM) contribute significantly to the health risk due to the fact that they are both mutagenic and carcinogenic. The PM2.5 particulate matter is primarily connected with combustion sources, such as engine exhaust and the burning of biomass. On the other hand, the PM2.5–10 particulate matter is primarily associated with suspended particles and mechanical phenomena [20]. There are impacts on the immune system that can be caused by exposure to lead contamination. As a result of Pb toxicity, neurotransmitter levels are disrupted, and major health problems can be evident due to organ damage (Table 4) [26]. According to the comparison between Cr(VI) and Cr(III), Cr(VI) is a carcinogen. It is possible for it to trigger asthmatic responses when it is inhaled, in addition to all of the hazardous consequences that it has. Additionally, exposure to Cr can result in the development of some genetic alterations that are detrimental to human health [26]. Heavy metals can have detrimental effects on several cellular components and organelles. Recent research has shown that metal ions can damage human DNA through interactions with DNA and nuclear proteins. This, in turn, can cause cell cycle regulation, apoptosis, and possibly cancer [87]. It has been found that heavy metals cause site-specific damage to human DNA and nuclear proteins when they interact. Many other impacts of Pollution took place on human health (Table 4). The metal causes direct harm by inducing conformational changes in the biomolecules. The production of reactive oxygen and nitrogen species, such as hydroxyl and superoxide radicals, hydrogen peroxide, nitric oxide, and other endogenous oxidants, is responsible for the "indirect" damage [88] caused by heavy metal exposure (Table 4).
8 Policy suggestions
Economic factors (businesses, households, etc.) need energy for production and consumption, making it a crucial resource for development. The end of the world would occur if the fuels used to generate electricity ran out. There is also a reciprocal relationship between pollution and progress; for example, in developing nations where there is little or no rules in place to ensure that manufacturing processes are ecologically benign, there is a strong correlation between human development and pollution levels. Organic farming is a method that can help reduce the amount of toxic metal entering our bodies. No pesticides are used, and only pure water with no detectable levels of pollutants is used in the treatment process [103, 104]. The use of biodiversity in pest management has the additional benefit of increasing the number of native plant and animal species. Temperature, pH, ionic strength, and the presence of natural organic matter are all significant elements in the removal of heavy metals from water. Heavy metals can be effectively removed using agricultural by-products and wastes such dairy manure and rice and peanut hulls. Mineral deposits and natural soil, on the other hand, appear to be less effective at removing heavy metals [104]. Sustainable development is only possible when all three economic actors are involved in policy formulation and all three actors contribute to the achievement of the goal. The government may use either voluntary or mandatory measures to achieve this end. Voluntary efforts include raising awareness about the risks of pollution and resource depletion, supporting responsible waste management at all stages of the production and consumption chains, and providing incentives for good behaviour. Regulations to limit pollutant emissions and waste, progressive levies on emissions and waste, and the maintenance of pollution standards are all examples of voluntary measures adopted to minimize pollution [104, 105]. The government will be able to fund waste management and recycling initiatives with the tax revenue it receives. The government should facilitate the widespread availability and affordable pricing of energy-efficient solutions in order to motivate a shift in consumer preferences toward product categories that use less energy and resources. Therefore, not just individuals but also corporations and governments need to work toward more sustainable consumption habits. Both national governments and multilateral organizations need to work together to create policies that protect the environment and stimulate the economy.
9 Conclusion
Economic growth is being stifled by pollution and environmental degradation caused by rising industrialization, urbanisation, mechanisation, use of fertiliser and pesticides in agriculture, and improper disposal of human waste, particularly in developing countries where environmental laws typically do not exist or are relatively less strict. By identifying the variables and technologies that contribute to pollution during the growth process and replacing them with less harmful alternatives, it is possible to simultaneously reduce pollution and increase productivity. These problems call for increasingly global remedies, making international cooperation essential. This research adds to the growing body of international strategies.
Data availability
All data generated or analysed during this study are included in this published article. Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
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Swain, C.K. Environmental pollution indices: a review on concentration of heavy metals in air, water, and soil near industrialization and urbanisation. Discov Environ 2, 5 (2024). https://doi.org/10.1007/s44274-024-00030-8
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DOI: https://doi.org/10.1007/s44274-024-00030-8