论文部分内容阅读
采用分散液相微萃取-连续光源石墨炉原子吸收光谱法,以吡咯烷基二硫代氨基甲酸铵(APDC)为螯合剂,CCl4为萃取溶剂,乙醇为分散剂测定环境水样中痕量Cr(VI),并考察了pH、萃取时间、温度和盐度等影响因素。结果表明,DLLME萃取5 mL水样的最佳条件为:pH 2.0,温度为35℃,螯合剂0.012 g/L,萃取溶剂30μL,分散剂0.5 mL。在此条件下,水样中铬(VI)的检出限为0.005μg/L,线性范围为0.05~2.00μg/L,对0.20μg/L,1.00μg/L Cr(VI)标准液分别测定10次的相对标准偏差为0.3%和2.4%。
The determination of trace Cr (Ⅵ) in environmental water samples was carried out by disperse liquid phase microextraction - continuous light source graphite furnace atomic absorption spectrometry with ammonium pyrrolidine dithiocarbamate (APDC) as chelating agent, CCl4 as extraction solvent and ethanol as dispersant (VI), and investigated the pH, extraction time, temperature and salinity and other influencing factors. The results showed that the optimum conditions for the extraction of 5 mL of water by DLLME were pH 2.0, temperature 35 ℃, chelating agent 0.012 g / L, extraction solvent 30 μL and dispersant 0.5 mL. Under these conditions, the detection limit of chromium (VI) in water samples was 0.005 μg / L with a linear range of 0.05-2.00 μg / L, and the concentration of Cr (VI) in 0.20 μg / L and 1.00 μg / L Cr The relative standard deviations of 10 times were 0.3% and 2.4%.