2-(4-氯-2-膦酸苯偶氮)-7-(2,6-二溴-4-磺胺基苯偶氮)-1,8-二羟基-3,6-萘二磺酸与铋的显色反应及其应用  

Color Reaction of 2-(4-Chloro-2-phosphono-benzenenazo)-7-(2,6-dibromo-4-sulfuryl-aminobenzenazo)-1,8-dihydroxy-naphthalene-3,6-disulfonic Acid with Bismuth and Its Application

作　　者：谌英武[1] 张慧娟[1] 胡洪涛[1] 叶乃义[1] 

机构地区：[1]武汉化工学院制药系,武汉430074

出　　处：《分析化学》2001年第6期689-691,共3页Chinese Journal of Analytical Chemistry

摘　　要：研究了２－（４－氯－２－膦酸苯偶氨）－７－（２，６－二溴－４－磺胺基苯偶氮）－１，８－二羟基－３，６－萘二碳酸（偶氮氯膦－ＤＢＳＡ，ＤＢＳＡＰＡ）与铋的显色反应。在高氯酸－水溶液中，显色剂与铋（Ⅲ）形成稳定的蓝紫色络合物，最大吸收波长在 ６３７ｎｍ处，在 ０～ ０．６０ｍｇ／Ｌ范围内符合比耳定律。该反应灵敏度高，ε６３７＝１．４８ ×１０５ Ｌ·ｍｏｌ－１·ｃｍ－１。应用该法测定了钨矿和铅黄铜矿中微量，结果满意。Reagent 2-(4-Chloro-2-phosphono -benzeneazo)-7-(2, 6-Dibromo-4-Sulfuryl- aminobenzenazo)-1, 8- dihydroxy- naphthalene- 3, 6 - disulfonic acid (DBSAPA ) for the spectrophotometric determination of trace amounts of bismuth(Ⅲ) has been studied. In 6 mol/L HCIO4 medium, DBSAPA reacts with bismuth(Ⅲ) to form a stable complex. The composition of complex is 2: 1 (L: M). The maximum absorption wavelength of the complex is at 637 nm. Beer' s law is obeyed in the range of 0 - 0.60 mg/L. The apparent molar absorptivity is 1 .48 ×105 L·mol-1·cm-1, relatively large amounts of usual metal ions are tolerated for determining microamouts of bismuth. This method has been applied to the determination of bismuth in mineral samples with satisfactory results.

关 键 词：2-(4-氯-2-膦酸苯偶氮)-7-(2 6-二溴-4-磺胺基苯偶氮)-1 8-二羟基-3 6-萘二磺酸 铋 分光光度法 显色反应 矿物分析 

分 类 号：O657.3[理学—分析化学]