采用2-氨基菲啶在膜滤器上进行预富集后，用分光光度法测定雨雪中的痕量硫酸盐。

Spectrophotometric determination of trace sulphate in rain and snow after preconcentration with 2-aminoperimidine on a membrane filter.

作者信息

Shida J, Satake H, Ono N, Fujikura T

机构信息

Department of Applied Chemistry, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa-shi, 992 Japan.

出版信息

Talanta. 1990 Jun;37(6):633-6. doi: 10.1016/0039-9140(90)80208-w.

DOI:10.1016/0039-9140(90)80208-w

PMID:18964991

Abstract

A simple and precise preconcentration technique, based on collecting a precipitate on a membrane filter and dissolving the filter and precipitate in an organic solvent, has been applied to the spectrophotometric determination of trace sulphate in rain and snow. The sulphate is precipitated with 2-aminoperimidine and the resulting compound is dissolved in nitric acid, made alkaline with sodium hydroxide and then adsorbed on tetradecyldimethylbenzylammonium nitrate. The precipitate is then collected on a membrane filter and both precipitate and filter are dissolved in dimethylsulphoxide (DMSO). The absorbance of the DMSO solution is measured at 550 nm against a reagent blank. The molar absorptivity is 2.1 x 10(4) 1 . mole(-1) . cm(-1) and the coefficient of variation for six measurements is < 1.5%. The detection limit (S/N = 3) is 0.06 mug of sulphate in 5 ml of sample solution.

摘要

一种简单而精确的预富集技术已应用于雨雪中痕量硫酸盐的分光光度测定，该技术基于在膜滤器上收集沉淀物并将滤器和沉淀物溶解于有机溶剂中。硫酸盐用2-氨基苊沉淀，所得化合物溶解于硝酸中，用氢氧化钠碱化，然后吸附在硝酸十四烷基二甲基苄基铵上。然后将沉淀物收集在膜滤器上，沉淀物和滤器都溶解于二甲基亚砜（DMSO）中。以试剂空白为参比，在550nm处测量DMSO溶液的吸光度。摩尔吸光系数为2.1×10(4) 1·mol(-1)·cm(-1)，六次测量的变异系数<1.5%。检测限（S/N = 3）为5ml样品溶液中0.06μg硫酸盐。