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采用铁氰化钾-FeCl3体系分光光度法测定酚磺乙胺。研究表明,酚磺乙胺可使Fe(Ⅲ)还原为Fe(Ⅱ),还原生成的Fe(Ⅱ)可以与K3[Fe(CN)6]反应生成可溶性普鲁士蓝KFe[Fe(CN)6],其最大吸收波长位于710 nm处。酚磺乙胺的质量浓度在0.064～9.6 mg/L范围内与吸光度呈现良好线性关系,线性回归方程A=0.03242+0.08244ρ(mg/L),相关系数r=0.9994,摩尔吸光系数ε=2.17×104L/(mol·cm),检出限0.047 mg/L;相对标准偏差(3.20 mg/L,n=11)为2.4%。方法用于测定药物注射液中酚磺乙胺含量,回收率为98.3%～102.9%。
Determination of phenylethylamine with potassium ferricyanide-FeCl3 system spectrophotometry. The results showed that phenol and sulfadiazine reduced Fe (Ⅲ) to Fe (Ⅱ), and reduced Fe (Ⅱ) reacted with K3 [Fe (CN) 6] to produce soluble Prussian blue KFe [Fe (CN) 6] , The maximum absorption wavelength at 710 nm. The calibration curve was linear with the absorbance in the range of 0.064 ~ 9.6 mg / L. The linear regression equation A = 0.03242 + 0.08244ρ (mg / L), the correlation coefficient r = 0.9994 and the molar absorptivity ε = 2.17 × 104L / (mol · cm). The detection limit was 0.047 mg / L. The relative standard deviation (3.20 mg / L, n = 11) was 2.4%. The method was used to determine the content of metsulfuron - methyl in drug injection. The recoveries ranged from 98.3% to 102.9%.