流动注射化学发光法测定水体中的N,N-二甲基乙酰胺  

Determination of N,N-Dimethylacetamide in Water by Flow Injection Chemiluminescence

作　　者：余萍[1] 高凤[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110159

出　　处：《理化检验（化学分册）》2016年第5期599-601,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在酸性条件下,高锰酸钾氧化硫代硫酸钠产生化学发光,N,N-二甲基乙酰胺(DMAC)对该体系的发光强度具有增强作用,基于此建立了测定水体中DMAC的流动注射化学发光法。当硫酸溶液的浓度为1.2mol·L^(-1),高锰酸钾溶液、硫代硫酸钠溶液的浓度均为5.0×10^(-4)mol·L^(-1)时,化学发光强度与DMAC的质量浓度在0.20~40.0mg·L^(-1)范围内呈线性关系,检出限(3S/N)为0.071mg·L^(-1)。方法用于水体中DMAC含量的测定,加标回收率在97.3%~104%之间,测定值的相对标准偏差(n=7)在1.2%~3.6%之间。A method was proposed for the determination of N,N-dimethylacetamide（DMAC）by flow injection chemiluminescence,based on the fact that DMAC could enhance the chemiluminescence intensity of the KMnO_4-Na_2S_2O_3 system in an acidic medium.When the concentrations of H_2SO_4,KMnO_4,Na_2S_2O_3 solutions were 1.2,5.0×10-4,5.0×10-4mol· L-1,respectively,a linear relationship was found between the chemiluminescence intensity and the mass concentration of DMAC in the range of 0.20-40.0 mg·L-1,with detection limit（3S/N）of 0.071 mg·L-1.The proposed method was applied to the determination of DMAC in water samples,giving recovery rates obtained by standard addition method in the range of 97.3%- 104%and RSDs（n=7）in the range of 1.2%-3.6%.

关 键 词：流动注射 化学发光 N N-二甲基乙酰胺 高锰酸钾 硫代硫酸钠 

分 类 号：O657.3[理学—分析化学]