Abstract
Discharge of untreated industrial effluents has been associated with soil contamination. Biochemical alterations in Lumbricus terrestris and remediation capacity of Azadirachta indica tree from industrial effluent discharge locations in Challawa (A and B) and Kura village (control location C) were assessed. Levels of nitrate, phosphate, iron, chloride, and hardness at locations A and B were significantly (p < 0.05) higher than those at location C, but their sulfate concentrations were significantly (p < 0.05) weaker. pH and magnesium concentration at location A were significantly higher than those at locations B and C. Levels of Fe, Cu, Zn, Pb and Mn in soils at the discharge locations were significantly (p < 0.05) higher than those of C. Azadirachta indica tree (AIT) had a translocation factor (TF) > 1 for Pb and Zn, while its biological concentration factor (BCF) was > 1 for Fe. Values of biological accumulation coefficient (BAC) for AIT and soil contamination factor (CF) were < 1 for the metals. Bioindicators of oxidative stress (MDA, GST, CAT and SOD) in earthworm supernatants from the discharge locations were significantly higher (p < 0.05) compared to that at location C, while their GSH levels were significantly (p < 0.05) lower. Acetylcholinesterase (AChE) activity in earthworm supernatants from discharge locations was significantly lower (p < 0.05) in comparison with the control. Trends in results revealed that AIT may be useful for extraction and stabilization of heavy metals in polluted soils. Also, the biochemical alterations in L. terrestris may serve as sensitive bioindicators of soil contamination.
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1 Introduction
Inadequate management of large quantity of wastes generated through various anthropogenic activities is a growing and critical problem in developing countries [27, 55]. Inappropriate discharge of industrial wastes has been a major concern for most governments and industrialists. The discharge of effluents in most instances does not always meet the pretreatment requirements, hence leading to increasing environmental pollution and the attending health hazards [56]. When toxic waste such as insecticides, heavy metals, ammonia, aromatic hydrocarbons and organic contaminants is improperly disposed, they accumulate mostly in groundwater, surface water and plants with deleterious effects on plants, humans and ecosystem [3, 67]. These wastes are extremely toxic even at minute concentrations. More so, most of them are non-degradable in nature and can persist in the environment thereby leading to bioaccumulation and biomagnification [7]. Ingestion of food contaminated with heavy metal has been reported to significantly deplete some essential nutrients in humans leading to malnutrition, reduced immunological defenses, damage DNA and vital organs and increased rates of gastrointestinal cancer [22, 36, 69]. The severity of health outcome from either acute or chronic exposure to heavy metals is dependent on the form and type of metal, means and extent of exposure, and individual susceptibility [37].
Phytoremediation is a natural mechanism whereby are utilized to clean-up, degrade and stabilize contaminants in polluted soils and water in order to improve their quality [57, 70]. The uptake mechanisms of heavy metal by plants include phytovolatilization, phytoextraction, phytostabilization, phytoaccumulation and rhizofiltration, [65]. Remediating soils polluted by heavy metals has been challenging due to their non-biodegradable nature. The traditional strategies employed for removing heavy metal in soil include soil washing, soil incineration, excavation and landfill and application of electric field [21, 63]. These physicochemical remediation strategies are not cost effective and are inefficient at low contaminants concentration [5, 21]. Furthermore, these approaches can permanently alter the biochemical properties of the soil thereby leading to the degradation of soil components and consequently introducing secondary pollutants [4]. The development of new remediation technologies is therefore necessary for efficient and cost-effective reclamation of heavy metal-contaminated soil. Neem plant (Azadirachta indica) belongs to the Meliaceae family, they are abundant in tropical regions of the world. Azadirachta indica trees grow to height of about 20–23 m and the diameter of its trunk is around 4–5 ft [31]. It has been used extensively for the treatment of many ailments due to the presence of various bioactive compounds in its parts [6]. Azadirachta indica has also been recommended as a potentially useful plant for remediating soil [1].
Biochemical and cellular responses of some organisms inhabiting contaminated soil have become important biological tools for quality assessment of soil ecosystem. [40]. Soil invertebrate such as Lumbricus terrestris (earthworm) offers substantive targets due to the essential role they play in organic matter decomposition, enhancement of soil structure and fertility. Terrestrial invertebrates are good biomarker of soil contaminants due to their direct contact with soil water or nutrients, unlike several vertebrates that have indirect exposure through food chain [40]. They are considerably affected by pollutants originating from agricultural processes such as excessive use of biocides, atmospheric deposition and industrial activities because of their direct interactions with soil. Earthworm has been shown to be a valuable soil pollution bioindicator [45].
Kano is a booming industrial center in Nigeria with many industrial establishments comprising of chemical industries, tanneries, textiles, and food processing factories which discharge waste waters into rivers and vegetation consequently causing the deterioration of water quality of Challawa River, one of the receiving rivers of the pollutants [14]. This research work therefore explored the use of earthworm as a novel biochemical marker of the effects of soil pollutants from industrial effluents as well as the efficiency of neem plant as phytoremediator in the swamp around Challawa industrial layout, Kano.
2 Materials and methods
2.1 Sampling locations
This research work was done in Challawa industrial estate, Kumbotso LGA, Kano State, Northern Nigeria. The major industries located in the experimental area include tannery, textiles, and food processing/packaging factories. Three study locations/sites were designated as A, B and C. Site C (control location) is in Kura village, where there is no industrial activities and discharge of effluents. More so, Kura has Kharif irrigation that supplies clean water to the plants. Plants and soil around site C (Kura) were subjected to less pollution compared to the experimental/sampling sites; hence, this qualifies site C the control. Location A referred to Fankudu-Gabas land area within 5–20 m of the canal, while location B is the Fakudu-Yamma land area within 5–20 m of the point of discharge into the River from the canal (Fig. 1). The effluents from these two locations are mainly from textile and tannery industries.
2.2 Collection of soil samples
Soil was obtained from the sampling locations (A, B and C). All containers were washed and dried before collection of samples. Samples of soil were collected in triplicate from each location. Top soils (0–20 cm depth) from the rhizosphere were obtained from where plant samples were uprooted. Soil samples were collected into appropriately labeled containers and transported immediately to the laboratory for analyses. The lumps and crumbs of each soil sample were removed after air drying, thereafter the soil samples were passed through 2 mm mesh in order to eliminate coarse particles before sub-sampling for physicochemical analysis.
2.3 Collection of plant samples
A whole plant of dominant plant species was uprooted from each sampling location. The plant samples obtained were authenticated at the herbarium section of Department of Biological Science, Bayero University Kano. Twelve plant samples were randomly taken from each location and were placed in clean well-labeled nylon bags, and transported to the laboratory for analyses.
2.4 Method of collection, homogenization and fractionation of Lumbricus terrestris
20 earthworm samples were randomly taken from each of the locations and were kept in clean and dried bottles at 0 °C. The earthworms were kept in the bottle with the designated label and thereafter kept in a freezer. Frozen samples of the earthworms were thawed on ice and subsequently homogenized in 0.02 M phosphate buffer, pH 7.5 and subsequently centrifuged at 4000 rpm at 25 °C for 20 min. The supernatant obtained was used for analysis.
2.5 Determination of physicochemical parameters of soil samples
The method described by Association of Official Analytical Chemists [8] was used to analyze the minerals in the soil samples from locations A, B and C. The soil samples were placed in the oven at 550 °C, the ash obtained was thereafter heated in 10 ml HCl (20% v/v) and then filtered into a volumetric flask, deionized water was added to the filtrate to make it up to 100 ml mark. Sulfate, nitrate, phosphate and chloride were determined spectrophotometrically using UV/Vis Spectrophotometer model 752 N.
2.6 Determination of heavy metals levels in soil samples
Atomic Absorption Spectrophotometer (AAS Model Bulk Scientific Accuzy 211) was used to determine the concentrations of iron, copper, zinc, lead, cobalt, chromium and manganese ions in 0.5 g of air-dried ground soil sample according to the AOAC [8] method. All values were expressed in ppm.
2.7 Determination of heavy metals levels in whole Azadirachta indica plant
The whole plant (roots, leaves and stem) were collected and weighed to determine their wet mass, thereafter they were oven dried at 80 °C for 48 h. The dried samples were ground and the concentration of iron, copper, zinc, lead, cobalt, chromium and manganese ions in the resulting powders were analyzed according to AOAC [8] method.
2.8 Determination of phytoremediation quotient
The translocation factor (TF) or shoot–root quotient is used to measure the potential of a plant to transfer heavy metals from the roots through shoots and leaves of a plant, which is mainly responsible for phytoextraction [9].
where [Metals] means concentration of the heavy metal.
The biological concentration factor (BCF) is the proportion of metal concentration in the roots of a plant to the soil concentration of that metal [62]:
Biological accumulation coefficient (BAC) is the ratio of heavy metal levels in shoots to that in the soil [74]:
Contamination factor (CF) is the ratio of the concentration of metal in the study (Cs) samples to the baseline concentration (Cb) [61]:
2.9 Determination of biochemical parameters
The total amount of protein in the supernatant of the earthworm was determined by using the method of Gornal et al. [32]. Malondialdehyde (MDA) levels in the supernatant was determined by Buege and Aust [18] method. Glutathione-S-transferase activity and the concentration reduced glutathione were evaluated using the methods of Habig et al. [33] and Ellman [23], respectively. Catalase in supernatant was evaluated using the method of Kaplan and Grooves [41]. Superoxide dismutase was determined by the method of Misra and Fridovich [52]. Acetylcholinesterase activity was evaluated according to the method of Ellman et al. [24].
2.9.1 Statistical analysis
The data generated are presented as mean ± SD of triplicate determinations except otherwise stated. Significance difference was evaluated using one-way ANOVA, the group means was compared by Tukey’s test. Values were considered significantly different at p < 0.05. All statistical analyses were performed using SPSS for windows version 20 (SPSS, Inc., Chicago, USA).
3 Results
The physicochemical properties of the soil samples from sites A, B and C are shown in Table 1. The levels of nitrate, phosphate, iron, chloride and hardness of soil samples obtained from sites A and B were significantly (p < 0.05) higher than the control site C. In contrast, sulfate concentrations of soil samples obtained from sites A and B were significantly (p < 0.05) less than the control site C. The pH of soil sample obtained from site A was significantly higher relative to that of sites B and C. Similarly, the level of magnesium in the soil sample obtained from site A was significantly higher than that of sites B and C.
The concentration of selected toxic metals in sampled soils obtained from the studied sites is presented in Table 2. Levels of Fe, Cu, Zn, Pb, and Mn in soil samples obtained from sites A and B were significantly (p < 0.05) higher than that of the control site C. In contrast, the levels of Cu, Fe, and Zn in soil samples obtained from sites A were significantly (p < 0.05) higher than site B. However, the concentrations of Pb and Mn in soil sample obtained from site A were not significantly different from that of site B. There was no significant (p < 0.05) difference in cobalt level of soil sample obtained from site A and that of the control soil sample. The level of cobalt in the soil sample obtained from site B however was significantly higher in comparison with that of the control site C.
The amount of Fe, Cu, and Zn in the roots of A. indica tree obtained from site A were significantly (p < 0.05) higher than the control location. However, the amounts of Fe, Cu and Zn in the root of A. indica plant obtained from site B and that of the control location were not significantly different (Table 3). The amounts of Pb in the roots of A. indica plant obtained from sites A and B were significantly lower than the control location. In contrast, the concentrations of Co and Mn in the roots of plant obtained from sites A and B were significantly higher relative to the control location. The levels of As and Ni were below detectable limit in the roots of A. indica plants obtained from all the three locations. Although, Cr was below detection level in the roots of A. indica plants obtained from sites A and B, its level in the root of A. indica plant obtained from the control location was measurable.
The levels of Fe, Cu, Zn and Mn in the shoots of A. indica plant obtained from sites A and B were significantly higher than that of the control location, but Pb concentrations in the shoots of A. indica plant obtained from sites A and B were significantly lower to what was obtained from the control location. The levels of Co, Ni and As in the shoot of A. indica plant obtained from all of the sampled locations were below detection limit. Similarly, the concentrations of Cr in the shoot of A. indica plant obtained from sites A and B were below detection limit, although its level in the shoot of A. indica plant obtained from the control location was measurable.
The TF, BCF, BAC and CF for A. indica obtained from the sampled sites are shown in Table 4. Azadirachta indica plant collected from all of the studied locations had TF < 1 for most of the selected heavy metals studied (Fe, Cu, Co and Mn), except for Pb and Zn (site C) where it showed TF > 1. Similarly, A. indica plant had BCF < 1 for Cu, Zn, Co, Pb and Mn from the three studied locations, while it showed BCF > 1 for Fe. The BAC and CF values for A. indica plant in this study were found to be < 1 for all of the selected heavy metals.
Figure 2 depicts the level of glutathione-S-transferase (GST) in supernatants of L. terrestris from the sampled locations. The activity of GST in the supernatants of L. terrestris obtained from sites A and B were significantly (p < 0.05) higher than the control location. GST levels in supernatants of L. terrestris obtained from sites A, B and the control site were not significantly different.
The activity of catalase (CAT) in the supernatants of L. terrestris obtained from the studied locations is presented in Fig. 3. Catalase activity in the supernatants of L. terrestris obtained from sites A and B were significantly (p < 0.05) higher than the control site. However, activities of CAT in supernatants of L. terrestris obtained from sites A and B were not significantly different.
Figure 4 depicts superoxide dismutase (SOD) activity in the supernatants of L. terrestris obtained from the studied locations. The activity SOD in the supernatants of L. terrestris obtained from sites A and B were significantly (p < 0.05) higher than the control location. The activity of SOD in the supernatants of L. terrestris obtained from site A and that of site B were not significantly different.
The activity of acetylcholinesterase (AChE) in supernatants of L. terrestris obtained from the sampled locations is presented in Fig. 5. Acetylcholinesterase (AChE) activities in supernatants of L. terrestris obtained from sites A and B were significantly (p < 0.05) lower when compared to that of the control site. There was no significant difference found between AChE activities in the supernatants of L. terrestris obtained from site A and B.
The level of reduced glutathione (GSH) in supernatants of L. terrestris obtained from the studied locations is presented in Fig. 6. The GSH level in the supernatants of L. terrestris obtained from sites A and B were significantly (p < 0.05) higher in comparison with the control location. The levels of GSH in the supernatant of L. terrestris obtained from sites A and that of site B were not significantly different.
Figure 7 depicts the level of malondialdehyde (MDA) in supernatants of L. terrestris obtained from the sampled locations. The amount of MDA in the supernatants of L. terrestris obtained from sites A and B were not significantly different; however, they were both significantly (p < 0.05) higher when compared to that of control location.
4 Discussion
Healthy soil needs to have a good structure, adequate organic material and be a place of abode to different kinds of organisms [17]. A soil considered to be healthy must possess several physicochemical and biological properties which permit it to perform its essential functions. This can be achieved in a natural environment by a soil attaining equilibrium with its surroundings, or in an environment managed by human intervention to improve the health of the soil [71]. The health of agricultural soils is linked to human health, since poor soils produce crops with reduced nutritional value. In addition, healthy soils also decrease erosion and help improve water and air quality [16].
In this study, all of the physicochemical parameters analyzed in soils obtained from the sampled locations were below the national standard permissible limit for effluent discharge into surface water [28]. The transportability, solubility and availability of toxic metals in the soil are impacted by pH of the soil and their transport decreases with increasing pH value, due to the precipitation of hydroxides and carbonates, consequently forming insoluble organic complexes [12, 64]. The pH of the soil samples obtained from the studied locations ranged from 7.47 to 8.57, which may have resulted in reduced removal or translocation of heavy metals by A. indica at these locations due to the moderately alkaline nature of soils. Although, phosphate level in the sampled locations were below the allowed limit, addition of phosphate to soils increases translocation of metals in soils. Mechanisms such as adsorption, dissolution/precipitation reactions, calcium substitution by metals during crystallization, and ion exchange processes facilitates translocation [51]. Therefore, elevated level of phosphate may enhance phytoremediation by promoting adequate levels of heavy metals that can be mop up by plant.
The results of heavy metal analysis in this study showed that levels of selected heavy metals in the soils obtained from the sampled locations were higher than the control location which is an indication of increasing heavy metal contamination from anthropogenic activities. However, the amount of these toxic metals in the soils obtained from sampled locations were below the threshold limit approved by Finland’s Ministry of the Environment [50]. The mean concentrations of the heavy metals in the soils across all studied sites are in the decreasing order of Fe > Cu > Pb > Zn > Co > Mn. Heavy metal contamination alters the biochemical properties of the soil including changes in the composition, size as well as the microbial community of the soil [73].
Climatic conditions, pH, types and age of plant, type and form of the metals are the major factors responsible for bioaccumulation of metals in plants [47]. In this present study, most of the selected heavy metals except Pb build up in the roots than in the shoots of A. indica plant. The reduced translocation of heavy metals into the shoots of the plant may be as a result of defense mechanisms adopted by plants to prevent bioaccumulation of heavy metals beyond the toxic threshold level [34, 66]. These mechanisms include change in membrane permeability, prevention of toxic metal ion transport across membrane, complexation of metals to ligands, increased exudation of compounds that chelate metal, stimulation of efflux pumping, and alteration in binding capacity of metal-cell wall [34, 53, 72]. The defense strategies of plants for heavy metal avoidance and tolerance is dependent on the nature and concentration of metal, species, organ and stage of development of the plant [53]. Bioaccumulation of heavy metals in the root of A. indica tree from all of the studied locations followed decreasing order of Fe > Cu > Pb > Co > Mn > Zn and were found to be within the allowed limit for heavy metals in the shoot [39].
Translocation factor shows the ability of plant species to transfer piled up metal from their roots to their shoot [43]. TF > 1 indicates efficient transfer from the roots to the shoot [11]. Azadirachta indica had TF > 1 for Pb and Zn in this study which implies that the plant can be used for phytoremediation [30, 46]. In contrast, A. indica was found to have TF < 1 for other metals, Fe, Cu, Co and Mn, which is an indication of inefficient root to shoot transfer of these metals in the plant. Therefore, A. indica plant restricted the transfer of these metals (Fe, Cu, Co and Mn) from the root to its shoot, thereby making it a good candidate for phytostabilization in the soil [13]. Phytostabilization is a technique that is employed to decrease the translocation and bioaccessibility of contaminants in the habitat, thereby preventing it from gaining access to the food chain or migration to groundwater [25]. Heavy metals in the soil may be immobilized by certain plants through complexation, precipitation, assimilation by roots or by reducing the valency of the metal in the rhizosphere [13, 74]. Plants with high BCF and low TF have been suggested to be useful for phytostabilization of contaminant in the soil [48]. In this study, A. indica plant had BCF > 1 and TF < 1 for Fe indicating that the plant retained Fe in its root and reduced its movement from the root to shoot [20]. These observations indicate the suitability of A. indica for phytostabilization of Fe, Cu, Co and Mn. BAC measures the potential of a type of plant to accumulate metals from the soil into its tissues [44]. Plant species that have BAC > 1 and TF > 1 can be categorized as hyperaccumulators and are the most suitable for phytoextraction of heavy metal contaminants [74]. Azadirachta indica showed BAC value < 1 for all of the metal studied which implies that the plant was inefficient in accumulating these metals in its shoot. This is in contrary to the work of Abdullahi et al. [1] that reported BAC values > 1 for Cd, Cu, Fe, Mn and Pb in the tissues of A. indica plant. Contamination factor is the ratio of the concentration of metal in the study samples to the baseline concentration. The CF values of all the metals evaluated in this study is less than 1, this indicates that the level of contamination in the soil is very low. This might be due to efficiency of A. indica in extracting the heavy metals from the soil [61].
Abnormal ROS production and depletion of major cellular antioxidants induced directly or indirectly by exposure to transition metals with redox and non-redox mediators can cause oxidative damage of biomolecules, this is a well-known mechanisms of metal-stimulated toxicity [26, 60]. Antioxidant defense system including reduced glutathione (GSH), superoxide dismutases (SOD), glutathione peroxidase (GSPx) and catalase counteracts the effect of ROS in living organisms [15]. Fluctuations in the levels of antioxidant enzymes and that of other antioxidant molecules such as GSH have been used for monitoring oxidative stress [68]. Activities of GST, CAT, and SOD in the supernatants of L. terrestris obtained from the two contaminated locations were elevated. The significant increase in these antioxidant enzymes could be a response to increased production ROS caused by the presence of toxic metal contaminants in soil [15, 75]. Arise et al. [10] also observed elevated activities of these antioxidant enzymes in the supernatant of earthworms obtained from soil site contaminated by oil spills. Superoxide dismutases are considered to play pivotal antioxidant roles as it catalyzes superoxide anion dismutation to H2O2 and subsequently to water and oxygen by catalase, thereby preventing the accumulation of H2O2 in the cells. The superoxide dismutase–catalase system provides the front line of antioxidant mechanism of defense against reactive oxygen species [75]. The significant increase in MDA levels in the supernatants of L. terrestris obtained from the two contaminated locations is an indication of lipid peroxidation in the tissues of the organism. This might be caused by heavy metals in the soils from these polluted locations [42, 58]. The depletion of GSH in the supernatants of L. terrestris obtained from the contaminated locations may be due to elevated level of ROS induced by toxic metals in these sampled soils [35]. Glutathione protects the cells against heavy metal induced oxidative stress [26]. Biosynthesis of GSH increases when the cells are acutely exposed to reactive oxygen species. However, when there is a sustained oxidative stress from chronic exposure to oxidative agents, GSH will be depleted because its synthesis cannot effectively cope with the increased production of ROS [35].
Acetylcholinesterase (AChE) is important for catalyzing the conversion of acetylcholine, a neurotransmitter, into choline and acetic acid, a reaction necessary for the termination of nerve impulses and signaling between synapses thereby preventing acetylcholine dispersal and activation of nearby receptors [49]. Acetylcholinesterase is irreversibly inhibited by organophosphate and carbamate compounds found in pesticides leading to building up of acetylcholine, hyperstimulation of muscarinic and nicotinic receptors, and disrupted nerve transmission [19]. Inhibition of acetylcholinesterase has been used to analyze the implication of environmental pollutants on the nervous system. Reduced activity of AChE was noticed in the supernatants of L. terrestris obtained from the two contaminated locations in this present study. The significant decrease in AChE activities could be attributed to the inhibitory effect of the pollutants found in the soils [29]. Several studies have reported the inhibitory role of some metallic ions such as Pb2+, Cd2+, Hg2+ and Cu2+ on AChE activity in humans and other animals [2, 38, 59].
5 Conclusion
This present study showed that A. indica with a TF > 1 for Pb and Zn might be useful for phytoextraction and photostabilization of Fe, Cu, Co and Mn in contaminated soils due to its restrictive efficiency of root to shoot transfer of these metals leading to their accumulation in the roots. Also, biochemical alterations in L. terrestris may serve as sensitive bioindicators of soil contamination.
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Arise, R.O., Basiru, D.I., Olufemi, O. et al. Biochemical transmutation in Lumbricus terrestris and phytoextraction of heavy metals from the swamp of Challawa industrial layout, Kano, Nigeria. SN Appl. Sci. 3, 362 (2021). https://doi.org/10.1007/s42452-021-04355-4
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DOI: https://doi.org/10.1007/s42452-021-04355-4