Abstract
In this work, laser-induced breakdown spectroscopy (LIBS) was applied for the detection of Pb in Tieguanyin tea and ash. Firstly, the Tieguanyin tea and ash containing Pb were prepared, and the difference of intensities of Pb I spectral lines before and after the ashing treatment was studied. It was found that the intensities of Pb I lines increased by 30 times and the standard deviation of background signal decreased by 41% after the ashing treatment. Therefore, the enrichment of Pb element by ashing treatment was used to detect Pb in tea with high sensitivity. Then, the calibration curve of Pb was established using spectral lines without self-absorption, and the determination coefficient (R2) for the linear fitting of calibration curve was 0.979 9. Finally, it was found that the limit of detection of Pb was 233.8 ppb. Compared with the results of other works which detect Pb directly, the enrichment of Pb by ashing treatment improved the detection sensitivity of Pb by about 200 times. In addition, this method can be applied to the high sensitivity detection of other heavy metals, such as Cr, Cd, Hg, etc in plants, Chinese herbal medicine, flour, rice, coal and other solid materials.
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REHAN I, GONDAL M A, ALDAKHEEL R K, et al. Determination of nutritional and toxic metals in black tea leaves using calibration free LIBS and ICP: AES technique[J]. Arabian journal for science and engineering, 2022, 47: 7531–7539.
ZHANG M, ZHANG X, HO C T, et al. Chemistry and health effect of tea polyphenol[J]. Journal of agricultural and food chemistry, 2019, 67(19): 5374–5378.
GONDAL M A, DASTAGEER M A, AL-ADEL F F, et al. Detection of highly toxic elements (lead and chromium) in commercially available eyeliner (kohl) using laser induced break down spectroscopy[J]. Optics and laser technology, 2015, 75: 99–104.
YANG P, ZHOU R, ZHANG W, et al. High-sensitivity determination of cadmium and lead in rice using laser-induced breakdown spectroscopy[J]. Food chemistry, 2019, 272: 323–328.
ZHOU R, LIU K, TANG Z Y, et al. Determination of micronutrient elements in soil using laser-induced breakdown spectroscopy assisted by laser-induced fluorescence[J]. Journal of analytical atomic spectrometry, 2021, 36(3): 614–621.
STENIO K, COSTA V C, DE MORAIS C P, et al. Direct determination of nutrient elements in plant leaves by double pulse laser-induced breakdown spectroscopy: evaluation of calibration strategies using direct and inverse models for matrix-matching[J]. Analytical methods, 2022, 14(12): 1246–1253.
JIN M T, YUAN H, LIU B, et al. Review of the distribution and detection methods of heavy metals in the environment[J]. Analytical methods, 2020, 12(48): 5747–5766.
REHAN I, REHAN K, KHAN M Z, et al. Detection of nutritional and toxic elements in Pakistani pepper powders using laser induced breakdown spectroscopy[J]. Analytical methods, 2020, 12(20): 2590–2598.
GONDAL M A, HABIBULLAH Y B, BAIG U, et al. Direct spectral analysis of tea samples using 266 nm UV pulsed laser-induced breakdown spectroscopy and cross validation of LIBS results with ICP-MS[J]. Talanta, 2016, 152: 341–352.
LU X, LIU Y Z, ZHANG Q H, et al. Study on tea harvested in different seasons based on laser-induced breakdown spectroscopy[J]. Laser physics letters, 2020, 17(1): 015701.
WANG J, SHI M, ZHENG P, et al. Quantitative analysis of lead in tea samples by laser-induced breakdown spectroscopy[J]. Journal of applied spectroscopy, 2017, 84(1): 188–193.
YANG X Y, HAO Z Q, LI C M, et al. Sensitive determinations of Cu, Pb, Cd, and Cr elements in aqueous solutions using chemical replacement combined with surface-enhanced laser-induced breakdown spectroscopy[J]. Optics express, 2016, 24(12): 13410–13417.
WU M F, WANG X, NIU G H, et al. Ultrasensitive and simultaneous detection of multielements in aqueous samples based on biomimetic array combined with laser-induced breakdown spectroscopy[J]. Analytical chemistry, 2021, 93(29): 10196–10203.
DE GIACOMO A, KORAL C, VALENZA G, et al. Nanoparticle enhanced laser-induced breakdown spectroscopy for microdrop analysis at subppm level[J]. Analytical chemistry, 2016, 88(10): 5251–5257.
ZHU C W, TANG Z Y, LI Q Z, et al. Lead of detection in rhododendron leaves using laser-induced breakdown spectroscopy assisted by laser-induced fluorescence[J]. Science of the total environment, 2020, 738: 139402.
BURAKOV V S, TARASENKO N V, NEDELKO M I, et al. Analysis of lead and sulfur in environmental samples by double pulse laser induced breakdown spectroscopy[J]. Spectrochimica acta part B-atomic spectroscopy, 2009, 64(2): 141–146.
ZHAO S Y, SONG C, GAO X, et al. Quantitative analysis of Pb in soil by femtosecond-nanosecond double-pulse laser-induced breakdown spectroscopy[J]. Results in physics, 2019, 15: 102736.
AKHTAR M, JABBAR A, AHMED N, et al. Analysis of lead and copper in soil samples by laser-induced breakdown spectroscopy under external magnetic field[J]. Applied physics B-lasers and optics, 2019, 125(6): 110.
MENG D S, ZHAO N J, MA M J, et al. Heavy metal detection in soils by laser induced breakdown spectroscopy using hemispherical spatial confinement[J]. Plasma science & technology, 2015, 17(8): 632–637.
LI X F, ZHOU W D, LI K X, et al. Laser ablation fast pulse discharge plasma spectroscopy analysis of Pb, Mg and Sn in soil[J]. Optics communications, 2012, 285(1): 54–58.
WANG X S, WAN S S, HE Y G, et al. Rapid determination of all element in MAPbI3 thin films using laser induced breakdown spectroscopy[J]. Spectrochimica acta part B-atomic spectroscopy, 2021, 178: 106123.
GORNUSHKIN I B, ANZANO J M, KING L A, et al. Curve of growth methodology applied to laser-induced plasma emission spectroscopy[J]. Spectrochimica acta part B-atomic spectroscopy, 1999, 54(3–4): 491–503.
ARAGON C, PENALBA F, AGUILERA J A. Curves of growth of neutral atom and ion lines emitted by a laser induced plasma[J]. Spectrochimica acta part B-atomic spectroscopy, 2005, 60(7–8): 879–887.
LU X, LIU Y Z, ZHANG Q H, et al. Study on tea harvested in different seasons based on laser-induced breakdown spectroscopy[J]. Laser physics letters, 2020, 17(1): 8.
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This work has been supported by the National Undergraduate Training Programs for Innovation and Entrepreneurship (No.202110060008).
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Li, J., Yao, L., Shen, L. et al. Detection of Pb in Tieguanyin tea and ash by laser-induced breakdown spectroscopy. Optoelectron. Lett. 20, 116–121 (2024). https://doi.org/10.1007/s11801-024-3080-y
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DOI: https://doi.org/10.1007/s11801-024-3080-y