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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期689-691,共3页
Chinese Journal of Analytical Chemistry
