基于改进火焰原子吸收光谱的土壤六价铬分析

摘要

The method for determining hexavalent chromium in soils was improved at steps of separation and extraction by flame atomic absorption spectrometry. The trivalent chromium and hexavalent chromium were effectively separated by using aluminum polychlorid as flocculating agent, isopentyl alcohol as extracting agent for reducing the test interference. Considering detective effects by dosage of aluminum polychlorid and oscillation time of extracted liquid, the improved method could be used to determine hexavalent chromium in soils after comparison of EPA 3060A method and not improved method of flame atomic absorption spectrometry.%针对分离和萃取环节,对火焰原子吸收光谱测定土壤中六价铬的方法加以改进.采用聚合氯化铝为絮凝剂、异戊醇为萃取剂,使三价铬和六价铬有效分离,并减少了测试干扰.考察了聚铝试剂用量和萃取液振荡时间对测定的影响,并将该方法与EPA 3060A方法和未改进的火焰原子吸收光谱法比较,表明改进后的方法能用于土壤中六价铬的测定.