分光光度法测定化学试剂中痕量钙  

Determination of Trace Calcium in Chemical Reagents by Spectrophotometry

作　　者：翟庆洲[1] 耿爱芳[1] 王巍[1] 胡伟华[1] 

机构地区：[1]长春理工大学西校区纳米技术研究中心,吉林长春130022

出　　处：《化学研究》2004年第1期30-32,共3页Chemical Research

摘　　要：在pH10.4的NH3 NH4Cl介质中,Ca2+与DBC 偶氮氯膦生成1∶1蓝色络合物.络合物的最大吸收波长位于624nm,方法的表观摩尔吸光系数ε624nm=3.82×104L·mol-1·cm-1,钙量在0～25μg/25mL范围内遵守比尔定律.本法用于化学试剂KCl,NaCl及NaNO3中痕量钙的测定,得到了满意的结果.A new method was developed for the determination of trace calcium using DBC-chlorophosphonazo as a colour reagent. In the medium of NH_(3)-NH_(4)Cl buffer medium at pH 10.4, calcium(Ⅱ) and DBC-chlorophosphonazo form a blue complex with molar ratio of 1∶1. The apparent molar absorptivity ε _(624 nm )= 3.82×10^(4) L·mol^(-1)·cm^(-1). Beer's is obeyed over the range of 0～25μg/25 mL of calcium. The method has been used in the determination of trace calcium in potassium chloride, sodium chloride and sodium nitrate chemical reagents. The results obtained were satisfactory.

关 键 词：化学试剂 钙 痕量分析 分光光度法 DBC-偶氮氯膦 

分 类 号：O614.231[理学—无机化学] O657.32[理学—化学]