间磺酸基偶氮安替比林光度法测定Cr(Ⅲ)  

SPECTROPHOTOMETRIC DETERMINATION OF CHROMIUM (Ⅲ) WITH m-SULFOANITIPYRYLAZO

作　　者：刘伟民[1] 范华均[1] 陈静玲[2] 

机构地区：[1]广东药学院药学系,广州510224 [2]广东药学院预防医学系,广州510224

出　　处：《化学分析计量》2002年第4期4-6,共3页Chemical Analysis And Meterage

摘　　要：研究了Cr(Ⅲ)与间磺酸基偶氮安替比林(m-SAA)的显色反应。在pH=4.0的HAc-NaAc缓冲介质中,Triton X-100存在并加热的条件下,Cr(Ⅲ)与m-SAA形成稳定的1∶1配合物,λ_(max)=624 nm,表观摩尔吸光系数为4.48×10~4L/(mol·cm),Cr(Ⅲ)的浓度在0～25.0μg/25 mL范围内符合比耳定律,检出限为5.9×10^(-3)μg/25 mL。该方法应用于模拟合成水样和环境水样中铬的测定,回收率分别为105％和97％,相对标准偏差分别为3.2％和3.9％。A highly sensitive spectrophotometric method was developed for the determination of Cr( Ⅲ ) with m-sulfoanitipyry-lazo( m-SAA) in the presence of Triton X - 100. In boiling water bath, Cr( Ⅲ ) can react with m-SAA and form a stable 1:1 complex in HAc - NaAc medium( pH =4.0). The maximum absorption is at 624 nm and its apparent molar absorptivity is 4.48 × 104 L/( mol · cm). Beer' s law is obeyed in the range of 0 - 25.0 μg/25 mL with the detection limit of 5.9 × 10-3 μg/25 mL for Cr(Ⅲ). This method was applied to the determination of Cr( Ⅲ ) in synthetic water sample and environment water sample, the recovery is 105% and 97% and the RSD is 3.2% and 3.9% respectively.

关 键 词：测定 间磺酸基偶氮安替比林 分光光度法 铬(Ⅲ) 水 

分 类 号：O661.1[理学—分析化学] O614.611[理学—化学]