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在单阀流动注射系统中 ,分别以串联在阀体流路中的阴、阳离子交换树脂微型柱分离富集 ,两种洗脱剂逆向洗脱 ,实现了Cr(Ⅲ )和Cr(Ⅵ )的在线分离富集和火焰原子吸收光谱法同时测定 .当富集 2min时 ,分析速度为 1 8样 /h ,测定Cr(Ⅲ )和Cr(Ⅵ )的特征浓度分别为 1 0 .1 2 μg/L和 1 4.43μg/L ( 1 %吸收 ) ,线性范围分别为0～ 1 0 μg/mL和 0～ 1 5 μg/mL ,对浓度分别为 1 μg/mL的Cr(Ⅲ )和Cr(Ⅵ )测定的相对标准偏差分别为 1 .6 2 %和 3.94% .该法应用于实际水样分析 ,加标回收率在90 .9%～ 1 0 4 5 %之间 .
In the single-valve flow injection system, the anion and cation exchange resin micro-columns in the flow path of the valve were separated and enriched in series and the two eluents were reversely eluted to achieve the effect of Cr (Ⅲ) and Cr (Ⅵ) On-line separation and enrichment were simultaneously determined by flame atomic absorption spectrometry. When the concentration was 2 min, the analysis speed was 18 h / h. The characteristic concentrations of Cr (Ⅲ) and Cr (Ⅵ) were determined to be 10.1 μg / L and 1 4.43 μg / L (1% absorption) respectively. The linear range was 0 ~ 10 μg / mL and 0 ~ 15 μg / mL, respectively. Cr (Ⅲ) and Cr ) Were 1.62% and 3.94%, respectively.The method was applied to the actual water samples and the recoveries of the spiked samples ranged from 90.9% to 104.5%.