1-(4-硝基苯基)-3-(3-硝基-5-氯吡啶)三氮烯的合成及其与锌的显色反应  

Synthesis of 1-(4-Nitrophenyl)-3-(3-Nitro-5-Chloro-Pyridyl)-Triazene and Its Chromatogenic Reaction with Zinc(Ⅱ)

作　　者：张春牛[1] 郑云法[1] 

机构地区：[1]丽水学院化学系,浙江丽水323000

出　　处：《岩矿测试》2006年第3期249-251,共3页Rock and Mineral Analysis

基　　金：浙江丽水学院重点课题项目(KZ04006)

摘　　要：报道了1-（4-硝基苯基）-3-（3-硝基-5-氯吡啶）三氮烯（NPNCPDT）的合成及其与锌的显色反应研究。在Triton X-100存在下，pH10．5的Na2B4O7-NaOH缓冲溶液中，该试剂能与锌发生显色反应，锌与NPNCPDT形成摩尔比为1：2的黄色配合物，在450nm处有-最大正吸收，540nm处有-最大负吸收。以450nm为参比波长、540nm为测量波长进行双波长测定，表观摩尔吸光系数为2．50×10^5L·mol^-1·cm^-1。锌量在0—480μg/L符合比尔定律。用拟定方法测定人发中的微量锌，方法精密度小于2．5％（RSD，n=6）。In this paper the synthesis of the new reagent 1-（4-nitrophenyl） -3-（3-nitro-5-chloro-pyridyl） -triazene （NPNCPDT） and its chromatogenic reaction with zinc have been studied. In the presence of surface active agent Triton X-100 and in the medium of Na2B4O7-NaOH buffer solution （pH = 10.5）, Zn（Ⅱ） reacts with the reagent to form a yellow complex with the molar ratio of 1 ： 2. The positive and negative maximum absorptions of the complex are at 450 nm and 540 nm, respectively. The molar apparent absorptivity is 2.50 × 10^5 L·mol^-1·cm^-1 using Du-al-wavelength spectrophotometric measurement with the reference wavelength at 450 nm and measurement wavelength at 540 nm. Beer＇s law is obeyed in the range of 0-480μg/L for Zn（Ⅱ）. The method has been applied to the direct determination of zinc in human hair samples with precision of less than 2.5% RSD （n =6）.

关 键 词：1-(4-硝基苯基)-3-(3-硝基-5-氯吡啶)三氮烯 锌 显色反应 

分 类 号：O657.32[理学—分析化学] P618.43[理学—化学]