三种消解法测定牛奶和乳制品中铅和镉的比较

IF 1.3 Q4 ENVIRONMENTAL SCIENCES
M. R. Mehrasebi, Mazyar Peyda, Rezgar Feizolahi, A. Taromi, Pegah Homayuni, Sally S. Fathi, Z. Farahmandkia
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引用次数: 0

摘要

背景:有毒金属通过水、土壤和植物进入人类食物链。乳制品的高消费量使得有必要测量其在牛奶及其产品中的浓度。方法:本研究选取乳制品、面团、酸奶和奶油四个样品。分别用0、20、40和60μg/kg的铅(Pb)和镉(Cd)对它们进行掺入。在所有样品中,在微波、湿法和干法灰化消解方法后,使用石墨炉原子吸收光谱(GFAAS)测定这些金属的浓度。为了选择最佳的消化方法,采用了回收率、增加浓度的线性度、相对标准偏差(RSD)和检测限。结果:根据结果,所有测量的RSD均小于5%。仪器对Pb和Cd的检出限分别为0.188和0.157μg/L。三种方法对所有消化样品的回收率在75.7%-120%之间。根据线性指数和R2,微波消解法对Pb加标样品的效率为90%至110%,干消解法对Cd加标样品最佳。结论:综合各项指标,微波消解法是测定铅、镉样品的最佳方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of three digestion methods for determination of lead and cadmium in milk and dairy products
Background: Toxic metals enter the human food chain through water, soil, and plants. High consumption of dairy products makes it necessary to measure their concentrations in milk and its products. Methods: In this study, four samples of dairy products, including milk, dough, yogurt, and cream were selected. They were spiked with concentrations of 0, 20, 40, and 60 μg/kg of lead (Pb) and cadmium (Cd) separately. In all samples, the concentration of these metals was determined using graphite furnace atomic absorption spectroscopy (GFAAS) after microwave, wet, and dry ashing digestion methods. To select the best digestion method, recovery percentage, linearity of increasing concentrations, relative standard deviation (RSD), and the limit of detection were used. Results: According to the results, the RSD of all measurements was less than 5%. The instrument detection limit for Pb and Cd were 0.188 and 0.157 μg/L, respectively. The recovery efficiency of all digested samples by three methods was between 75.7% and 120%. According to the linearity index and R2 , the microwave digestion method with 90 to 110% efficiency was the best for Pb-spiked samples, and the dry digestion method was the best for Cd-spiked samples. Conclusion: Considering all indexes, microwave digestion was the best method for Pb and Cd samples.
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来源期刊
CiteScore
2.40
自引率
37.50%
发文量
17
审稿时长
12 weeks
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