通过与PAR和CTAB形成三元络合物分光光度法测定代森锰

Spectrophotometric determination of maneb by ternary complex formation with PAR and CTAB.

作者信息

Kapoor J, Kumar A, Gupta U, Rao A L

机构信息

Department of Chemistry, Punjabi University, Patiala-147 002, India.

出版信息

Talanta. 1994 Dec;41(12):2061-5. doi: 10.1016/0039-9140(94)00179-0.

DOI:10.1016/0039-9140(94)00179-0

PMID:18966171

Abstract

A rapid, simple, direct, and sensitive method has been developed for the determination of maneb (manganese ethylenebisdithiocarbamate) based on the formation of manganese-4-(2'-pyridylazo) resorcinol complex by a ligand displacement reaction, which is rendered water soluble by a cationic surfactant cetyltrimethylammonium bromide (CTAB) by the formation of an ion association complex. Beer's law is obeyed over the concentration range 0.08-2.4 mug/ml of the final solution at 500 nm in pH range 8-12. The molar absorptivity and Sandell's sensitivity are calculated to be 8.84 x 10(4) l.mol(-1).cm(-1) and 0.003 mug/cm(2), respectively. The developed method has been applied to the determination of maneb in commercial formulations, synthetic mixture, grain samples and vegetables.

摘要

基于配体置换反应形成锰-4-(2'-吡啶偶氮)间苯二酚络合物，开发了一种快速、简单、直接且灵敏的方法来测定代森锰（锰代森锌，即乙撑双二硫代氨基甲酸锰）。通过阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）形成离子缔合物，使该络合物具有水溶性。在pH值为8 - 12、500 nm波长下，最终溶液浓度范围为0.08 - 2.4 μg/ml时符合比尔定律。计算得出摩尔吸光系数和桑德尔灵敏度分别为8.84×10⁴ l·mol⁻¹·cm⁻¹和0.003 μg/cm²。所开发的方法已应用于商业制剂、合成混合物、谷物样品和蔬菜中代森锰的测定。