新试剂N—壬基—N’—(氨基对苯磺酸钠)硫脲的合成及其分析性能的研究

Synthesis of New Reagent N Nonyl N (Sodium p Aminobenzenesulfonate) Thiourea(NPT) and the Investigation of Its Analytical Properties

合成了水溶性的新试剂Ｎ—壬基—Ｎ—（氨基对苯磺酸钠）硫脲（ＮＰＴ），经元素分析、ＩＲ、ＵＶ、１ＨＮＭＲ测试，确定了其结构．实验了不同介质中，同４０多种离子的反应情况，其中只有Ａｇ＋、Ｂｉ３＋、Ｃｕ２＋、Ｈｇ２＋、Ｎｉ２＋离子有特征性反应，可作为Ｃｕ２＋、Ｎｉ２＋的新鉴定试剂．鉴定Ｃｕ２＋的检出限量ｍ＝０．０３７μｇ，最低浓度ｃ＝１μｇ／ｍｌ，４３种常见离子不干扰．鉴定Ｎｉ２＋的检出限量ｍ＝０．１２μｇ，最低浓度ｃ＝３．３μｇ／ｍｌ．灵敏度与选择性与丁二酮肟相当．测定了在弱酸、中性和弱碱性介质中同４０多种离子形成配合物的表现摩尔吸光系数，可作为分光光度法测定Ｃｕ２＋、Ｐｄ２＋的显色剂．测定Ｃｕ２＋，ε３４９．２＝４．８７×１０４Ｌｍｏｌ－１ｃｍ－１，４３种离子中，只有大量Ｆｅ３＋、Ａｌ３＋干扰．则定Ｐｄ２＋，ε２９７．８＝１．２５×１０５Ｌｍｏｌ－１ｃｍ－１，５１种离子只有Ｃｕ２＋干扰测定，用于实际样品的检测，均获满意结果．是目前测定Ｐｄ２＋的分析性能优良的试剂之一．

The new water soluble reagent N Nonyl N (Sodium p Aminobenzenesulfonate) Thiourea (NPT) was synthesized and its structure was confirmed by elemental analysis,IR, UV and 1 HNMR spectra. We also tested the reaction of this new reagent on more than forty kinds of ions in different medium, it indi Cated that only Ag +,Bi 3+ ,Cu 2+ ,Hg 2+ and Ni 2+ had characteristic reaction on NPT, so NPT could be used as an identification reagent of Cu 2+ and Ni 2+ . In appraising Cu 2+ : m =0.037μg, c =1μg/ml, in forty three kinds of common ions none influenced the identification, we regarded NPT as one of the best reagents of identification of Cu 2+ ; In appraising Ni 2+ :m=0.12μg, c=3.3μg/ml,its sensitivity and relectivity were analogous with dimethylglyoxime. Then we determined the apparent molar absorptivity of the corresponding complexes formed by NPT and more than forty kinds of ions in the medium of weak acid, neutrality and weak base respectively. It could be used as a spectrophotometric reagent in quantitative determination of Cu 2+ and Pd 2+ . In determining Cu 2+ :ε 343.2 =4.87×10 4 L·mol -1 ·cm -1 ,forty three kinds of ions didnt influence it; In determining Pd 2+ :ε 297.2 =1.25×10 5 L·mol -1 ·cm -1 ,in fifty one kinds of ions only Cu 2+ influenced it. We acquired satisfying results when using NPT in practical sample determination. It is one of the superior reagents in analytical property using in determining Pd 2+ at present time.