紫外分光光度法测定硫酸铵中吡啶及其同系物

Determination of Pyridine and its Homologues in Ammonium Sulfate by Ultraviolet Spectrophotometry

提出了紫外分光光度法测定煤化工企业副产的硫酸铵中吡啶及其同系物含量的方法。用水溶解硫酸铵样品,以空白溶液为参比,用1 cm石英比色皿在波长256 nm处测定溶液的吸光度。结果表明,吡啶及其同系物的质量浓度在20.0μg/mL以内与吸光度呈线性关系,测定值的相对标准偏差小于3.18%,加标回收率为97.6%~103.6%,方法可满足硫酸铵中吡啶及其同系物含量的测定要求。

A method for the determination of pyridine and its homologues in ammonium sulfate,a by-product of coal chemical enterprises,using ultraviolet spectrophotometry is proposed.The ammonium sulfate sample is dissolved with water,while the blank solution is taken as the reference,and 1 cm quartz cuvette is used to measure the absorbance of the solution at the wavelength of 256 nm.The results show that the mass concentration of pyridine and its homologues are linear with absorbance within 20.0μg/mL.The relative standard deviation of the measured value is less than 3.18%,and the recovery rate is 97.6%-103.6%.The method can meet the requirements for the determination of pyridine and its homologues in ammonium sulfate.