对乙酰基偶氮胂分光光度法测定铬(Ⅲ)的反应研究及应用  

Spectrophotometric Determination of Chromium(Ⅲ) by P-Acetylarsenazo

作　　者：谢世红 谭洪涛 陈洪 

机构地区：[1]江西省水产技术推广站,南昌330046 [2]江西省食品卫生监督检验所,南昌330029

出　　处：《微量元素与健康研究》2004年第4期52-53,共2页Studies of Trace Elements and Health

摘　　要：拟定了一种测定铬 (Ⅲ )的分光光度法。研究了对乙酰基偶氮胂 (ASAPA)与铬 (Ⅲ )显色反应。在 pH2 .6～ 5 .0盐酸—乙酸钠缓冲介质中 ,Cr(Ⅲ )与对乙酰基偶氮胂 (ASAPA)形成配合物 ,λmax =6 30nm ,ε63 0 nm=1.8× 10 5L/ (mol·cm) ,铬 (Ⅲ )含量在 0 1～ 15 μg/ 2 5ml范围内遵从比尔定律 ,反应选择性好 ,用于水、啤酒、葡萄酒中铬 (Ⅲ )的测定 ,结果满意。A simper and sensitive Spectrophotometric method is proposed to the determination of chromium(Ⅲ).the method based on the composition of chromium(Ⅲ)with P-Acetylarsenazo in a HCl-Na 2C 2O 4 medium(pH 4.0) with the apparent molar absorptivity of 1.1×105L/(mol·cm), Beer's law is obeyed over the range of 0～7 μg/25 ml for chromium(Ⅲ).This method has been applied to the determination of chromium(Ⅲ)in water, beer and wine with good recult.

关 键 词：铬(Ⅲ) 对乙酰基偶氮肿 分光光度法 

分 类 号：O657.3[理学—分析化学]