【作者】 马东兰； 丁国生； 王玉炉；

【Author】 MA Dong-Ian,DING Guo-sheng,WANG Yu-lu(College of Chemistry and Environmental Science .Major Open Laboratory in Environmental Engineering of Henan Province,Henan Normal University.Xinxiang 453002.China )

【机构】 河南师范大学化学与环境科学学院河南省环境工程重点开放实验室；

【摘要】 介绍了新试剂N-苯基-N’-（氨基对苯磺酸钠）硫脲（PPT）的合成方法.并研究了它与金的显色条件.建立了光度法测定微量金的新方法.在pH5.0～5.8的HAc-NaAc缓冲体系中,在溴化十六烷基三甲胺（CTMAB）存在下,An（Ⅲ）与PPT形成组成比1:3的黄色水溶性络合物,其最大吸收峰位于317.0um,表观摩尔吸光系数ε=3.68×10⁴L·mol^-1·cm^-1,Au（Ⅲ）含量在0～3.2mg/L范围内服从比尔定律.该法灵敏度较高、线性范围大且操作简便,测定结果准确可靠.将该法用于金矿石中金的测定,所得结果及回收实验均令人满意.更多还原

【Abstract】 The synthesis of a new reagent N-phenyl-N’-(sodium p-aminobenzenesulfonate)thiourea is described here. The chromogenic reaction of the reagent with Au( Ⅲ ) is studied by spectrophotometry. In the range of pH5. 0-5. 8,Au3+ forms a stable complex with PPT,which shows a maximum absorption at 317. 0 nm with the molar absorptivity e=3. 68×104 L · mol-1 · cm-1. Beer’s law is obeyed in the range of 0-3.2 mg/L. The method has been used for the determination of trace Au in ore samples. The results are satisfactory.更多还原