摘要
对新显色剂 1 羟基 2 (5 NO2 2 吡啶偶氮 ) 8 氨基 3 ,6 萘二磺酸 (简称 5 NO2 PAH)与钴离子显色的适宜条件及其共存离子的影响进行了研究 ,建立了 5 NO2 PAH测定钴的新显色反应体系 .结果表明 ,在 pH =8.4~ 1 0 .0范围内 ,钴与试剂形成稳定的 1∶2配合物 ,其最大吸收峰位于 690nm ,表观摩尔吸光系数εCo=6.3 6× 1 0 4 L/(mol·cm) ,钴的浓度在 0~ 7μg/1 0mL范围内遵守比尔定律 .方法已用于VB12
The optimum condition for the colour reaction of cobalt with the new reagent 1-hydroxyl-2-(5-nitro-2-pyridylazo)-8-aminonaphthalene-3,6-disulfonic acid (5-NO 2-PAH) is studied. The experimental results show that, in the pH range of 8.4~10.0, cobalt can react with 5 NO 2 PAH to form a stable complex exhibiting a maximum absorptivity at 690 nm . The apparent molar absorptive is 6.36×10 4 L/(mol·cm). Beer′s law is obeyed in the range of 0~7 μg/mL cobalt. The method has been applied to the determination of cobalt in samples with satisfactory results.
出处
《陕西师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2002年第2期66-69,共4页
Journal of Shaanxi Normal University:Natural Science Edition
基金
陕西省自然科学基金资助项目 (97H0 9)