Flow Injection Semi-online Sorbent Extraction Preconcentration for Graphite Furnace Atomic Absorption Spectrometry
Flow Injection Semi-online Sorbent Extraction Preconcentration for Graphite Furnace Atomic Absorption Spectrometry
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DOI：
10.1006/mchj.1999.1724
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发表时间：
1999-07
影响因子：
4.8
通讯作者：
Q. Jin;X. Su;F. Liang;Hanqi Zhang
中科院分区：
文献类型：
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作者：
Q. Jin;X. Su;F. Liang;Hanqi Zhang
摘要将微流动注射吸附剂萃取预富集系统与石墨炉原子吸收光谱仪联用。这种组合形成了一个测定痕量重金属的综合系统。以十八烷基官能团键合硅胶(C18)为吸附剂，在15-μL锥形微柱上进行了吸附。待测金属以二乙基二硫代氨基甲酸酯螯合物的形式预富集于60 S色谱柱上，然后用去离子水冲洗，用40μL乙醇洗脱。与直接进样40μL水溶液相比，吸附萃取、淋洗液进样和峰面积测量的60-S进样量分别达到30、32和29倍，检出限(3ς)分别为7.8、12.8和3.9 ng/L。对标准物质中痕量钴、镍和铅的测定结果表明，标准值和测定值之间没有显著差异。
Abstract A micro-flow injection sorbent extraction preconcentration system was combined with a graphite furnace atomic absorption spectrometer. The combination results in an integrated system for the determination of trace amounts of heavy metals. Silica bonded with octadecyl functional groups (C 18 ) was used as a sorbent in a 15-μL conical microcolumn. The metals to be determined were preconcentrated as diethyl dithiocarbamate chelates onto the column for 60 s and then rinsed with deionized water and eluted with 40 μL of ethanol. Compared with direct injection of 40 μL of aqueous sample solution, enrichment factors of 30, 32, and 29 and detection limits (3ς) of 7.8, 12.8, and 3.9 ng/L for cobalt, nickel, and lead, respectively, were obtained with 60-s sample loading at 3.0 mL/min for sorbent extraction, 40 μL of eluate injection, and peak area measurement. The results obtained for trace amounts of cobalt, nickel, and lead in reference materials showed that there were no significant differences between the certified and determined values.