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在pH为5.0~6.5的溶液中,磺胺二甲嘧啶盐与Cu2+结合形成2:1络合物,此络合物用氯仿萃取,火焰原子吸收光度法测定络合萃取后水相中剩余Cu2+的吸光度A。发现试剂空白溶液与试样溶液的萃余液之间Cu2+吸光度差ΔA随磺胺二甲嘧啶含量增大而线性增大。据此,我们建立了一种Cu2+络合萃取FAAS法间接测定磺胺二甲嘧啶新方法。优化条件下,方法线性范围为14.6~144mg/L,线性回归方程为ΔA=0.0025ρ-0.0046(r=0.9991)。检出限为5.6mg/L,方法回收率为99.3%~99.6%。
In pH 5.0 ~ 6.5 solution, sulfamethazinum salt combined with Cu2 + to form a 2: 1 complex, the complex was extracted with chloroform, flame atomic absorption spectrophotometry after the complex extraction of the remaining aqueous phase of Cu2 + Absorbance It was found that the difference in Cu2 + absorbance ΔA between the reagent blank solution and the sample solution raffinate increased linearly with increasing sulfamethazine concentration. Accordingly, we established a new method of indirect determination of sulfamethazine by Cu2 + complex extraction and FAAS method. Under the optimal conditions, the linear range of the method was 14.6 ~ 144 mg / L, and the linear regression equation was ΔA = 0.0025ρ-0.0046 (r = 0.9991). The detection limit was 5.6mg / L, the recovery rate was 99.3% ~ 99.6%.