CAJ | 학술논문

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-萘二磺酸(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*#形成稳定的蓝紫色络合物，最大吸收波长在637 nm处,在0～0.60 mg/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。应用该法测定了钨铋矿和铅黄铜矿中微量铋，结果满意。
연구료2-（4-록-2-련산분우안)-7-(2，6- 이추-4-광알기분우담)-1,8-이간기-3,6-내이광산(우담록련-DBSA，DBSAPA）여필적현색반응。재고록산-수용액중, 현색제여필*#형성은정적람자색락합물，최대흡수파장재637 nm처,재0～0.60 mg/L범위내부합비이정률。해반응령민도고，ε637=1. 48×105 L*mol-1*cm-1。응용해법측정료오필광화연황동광중미량필，결과만의。
Reagent 2-(4-Chloro-2-phosphono-benzenenazo)-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 HClO4 medi um , 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 a bsorptivity 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 res ults.