新显色剂哌啶荒酸哌啶萃取光度法测定Ni(Ⅱ)的研究和应用

Extraction Spectrophotometric Studies of a New Reagent Piperidine Dithiocarbamate Piperidine on the Determination of Micro Amount of Ni(Ⅱ) and its Application

文章研究了哌啶荒酸哌啶（ＰＤＰＣ）与 Ｎｉ（Ⅱ）显色反应的条件，确定在ｐＨ＝５ ０左右的条件下形成黄色络合物，络合物组成比为Ｎｉ（Ⅱ）：ＰＤＰＣ＝１：２，可见光区最大吸收波长＝４００ｎｍ，表观摩尔吸光系数ε＝４９×１０－１Ｌ·ｍｏｌ－１·ｃｍ－１，应用拟定方法测定合成水样中Ｎｉ（Ⅱ）含量，结果满意。

Piperidine dithiocarbamate piperidine(PDPC) is a new colour reagent for the determination of Ni(Ⅱ) at pH4.5-6.0. The apparent molar absorptivity is 1.49×104L·mol-1 cm-1 for Ni( Ⅱ)-complex(Ni(Ⅱ) :PDPC = 1:2) at 400nm. The method is applied to determine trace Ni(Ⅱ) in synthetical water sample with satisfactory results.