摘要
在pH10 0的NH3·H2O-NH4Cl缓冲介质中,Ca2+与三溴偶氮胂形成1∶2蓝色络合物,最大吸收波长位于610nm处,表观摩尔吸光系数ε610nm=7 16×104,在25mL溶液中钙量在0～25μg范围内遵守比尔定律。本法用于水样及化学试剂中钙测定,结果满意。方法简单,快速,结果准确。
In NH_3·H_2O-NH_4Cl buffer medium at pH 10.0,calcium(Ⅱ) can form a blue complex with the composition of 1∶2(M∶R) with tribromoarsenazo.The maximum absorption wavelengh locates at 610 nm.The apparent molar absorptivity is ε_(610 nm)=7.16×10~4 (L·mol^(-1)·cm^(-1).)Beer's law is obeyed in the range of 0-25 μg/25 mL for calcium.The method has been applied to the determination of calcium in rain water and sodium sulfate with satisfactory results.The present method is simple,rapid and accurate.
出处
《冶金分析》
CAS
CSCD
北大核心
2004年第5期53-55,共3页
Metallurgical Analysis
