显色剂N-间甲苯基-N'-(氨基对苯磺酸钠)硫脲光度法测定微量铂(Ⅳ)  

Spectrophotometric Determination of Micro Amounts of Platinum With N-m-Methylphenyl-N' - (Sodium p-Aminobenzenesulfonate) Thiourea

作　　者：马东兰[1] 马狂飚[1] 王玉炉[1] 李建平[1] 

机构地区：[1]河南师范大学化学系,新乡453002

出　　处：《分析化学》1997年第8期902-905,共4页Chinese Journal of Analytical Chemistry

基　　金：河南省自然科学基金

摘　　要：研究了新试剂－Ｎ间甲苯基－Ｎ’－（氨基对苯磺酸钠）硫脲（ＭＭＰＴ）与铂（Ⅳ）的显色反应，结果表明，在 ｐＨ ３．７～４．４的 ＨＡｃ－ＮａＡｃ缓冲体系中，Ｐｔ（Ⅳ）与 ＭＭＰＴ形成 １：３的绿色水溶性络合物，最大吸收波长位于 ７５４．４ ｎｍ，表观摩尔吸光系数ε７５４．４＝８．５８ × １０４·ｍｏｌ－１·ｃｍ－１，铂含量在０～１．２８ ｍｇ／Ｌ的范围内服从比尔定律。本法灵敏度高、选择性好、操作简便、测定结果准确可靠。将其用于矿石和催化剂中铂的测定，结果令人满意。The color reaction of new water soluble color reagent N-m-methylphenyl-N' - (Sodium-p-aminobenzene sulfonate) thiourea (MMPT) with Pt(N ) was studied. The result indicates that in the HAc-NaAc butter solution with pH 3. 7～4. 4, a stable 1: 3 green com- plex of Pt(Ⅳ) with reagent is formed. The apparent molar absorptivity is 8. 58 ×104L. mol1. cm1 at the maximum absorption wavelength 754. 4 nm and Beer's law is obeyed in the range of 0～1. 28 mg/L. The method has high sensitivity and selectivity. Its operation is simple. Also it can be successfully used for the determination of Pt (Ⅳ) in minera1 and catalysts.

关 键 词：光度法 显色剂 MMPT 硫脲 铂 催化剂 

分 类 号：O614.826[理学—无机化学]