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Spectrophotometric determination of lead in food with 2-(2-Bromo-6-Cyano-4-Nitrobenzeneazo)Hydr-oquinone as the chromogenic reagent
Author(s): CHU Zhao-hua, HAO Gui-xia
Pages: 105-
106,117
Year: 2011
Issue:
2
Journal: China Condiment
Keyword: 2-(2-氰基-4-硝基-6-溴苯偶氮)对笨二酚; 分光光度法; 食品; 铅;
Abstract: 目的:探索测定食品中痕量铅的新方法.方法:以新试剂2-(2-氰基-4-硝基-6-溴苯偶氮)对苯二酚作为显色剂,研究分光光度法测定铅的优化条件.结果:在HArNaAc缓冲溶液中,铅(Ⅱ)与显色剂形成桔红色络合物,最大吸收波长为457 nm,表观摩尔吸光系数ε=5.13×104 L·mol-1·cm-1,铅的质量在0-15 μg/25 mL范围内符合比耳定律.相对标准偏差为2.3%-2.8%.结论:该...
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