摘要
根据 KI和 Cr( )在 H2 SO4 介质中反应生成单质碘 ,碘使淀粉变蓝 ,利用分光光度法建立了测定Cr( )的新方法。在 0 .0 9— 1.0 4 mg/L Cr( )范围内 ,吸光度与 Cr( )的浓度呈线性关系。检出限为0 .0 88mg/L;表观摩尔吸光系数为 4 .94× 10 4 L· mol-1· cm-1。本法简便、灵敏度较高 ,用于合成样品中Cr( )的测定 。
A new determination method of chromium(Ⅵ) was astablished with spectrophotometry based on the reaction of KI and chromium(Ⅵ) in a solution of H 2SO 4,which gets iodine and turns starch solution into blue.The linear range of the determination is 0.09—1.04mg/L.The detection limit for chromium(Ⅵ) is 0.088mg/L.An apparent molar absorptivity is 4.94×10 4L·mol -1·cm -1.This method is simple and very sensitive,it is used for the determination of chromium(Ⅵ) synthetic sample with satisfactory results.
出处
《光谱实验室》
CAS
CSCD
2003年第4期598-600,共3页
Chinese Journal of Spectroscopy Laboratory
