摘要
建立了分散液相微萃取-分光光度法测定痕量肼的新方法.在0.2 mol/L HCl介质中,以对二甲氨基苯甲醛(PDAB)为显色剂,三氯甲烷为萃取剂,乙醇为分散剂分离富集溶液中痕量肼.优化了反应酸度、萃取剂与分散剂的选择和用量、显色剂用量、显色时间和萃取时间等影响因素.最佳实验条件下,方法的线性范围0.80~120μg/L(r=0.999 5),检出限0.26μg/L.应用于实际水样测定,回收率在98.0%~103.4%之间,RSD在2.7%~3.2%之间.
A new method for the determination of trace hydrazine was developed by dispersive liquid- liquid microextraction preconcentration and spectrophotometry. In 0.2 moL/L HCl medium, p-dimethyl- aminobenzaldehyde （PDAB） was used as a chromogenic reagent, and chloroform and ethanol were selected as extraction and dispersive solvents respectively. The hydrazine complex were extracted into the chloroform, then the sedimented phase was determined by spectrophotometry. Some factors with reaction acidity, extraction and dispersive solvent type and volume, concentration of the chromogenic rea- gent, developing time and extraction time were optimized to improve the extraction efficiency of hydrazine and its subsequent determination. Under the optimum conditions, the linear range of hydrazine was 0.80-120 μg/L （r= 0.999 5） and the detection limit was 0.26 μg/L. The method was applied to the determination of trace amounts of hydrazine in water sampleswith 98.0%-103.4% of the recoveries and 2.7%-3.2% of the relative standard deviations.
出处
《化学研究》
CAS
2017年第2期206-209,共4页
Chemical Research
基金
湖北省教育厅科学技术研究项目(Q20126002)
关键词
分散液相微萃取
分光光度法
肼
水样
dispersive liquid-liquid microextraction
spectrophotometry
hydrazine
water samples
