作者应用吡咯二硫代氨基甲酸铵(APCD)-甲基异丁酮(MIBK)萃取,石墨炉原子吸收光谱(GFAAS)法分别测定了水中的Cr(Ⅲ)和Cr(Ⅵ)。确定了Cr(Ⅲ)、Cr(Ⅵ)萃取的最佳pH范围为2.5～4.0,萃取时间分别为10分钟和20分钟,APCD和缓冲液的浓度分别为:Cr(Ⅲ):1.2%与0.04～0.2%,Cr(Ⅵ);0.2%与1%。萃取液中的螫合物至少可稳定30天,大多数金属离子不产生干扰。此法的 The authors investigated the Cr (¢ ó) and Cr (¢ ö) contents in water by pyrithione dithiocarbamate (APCD) -methyl isobutyl ketone (MIBK) extraction and graphite furnace atomic absorption spectrometry (GFAAS) The optimum pH range of Cr (Ⅲ) and Cr (Ⅵ) extraction was determined to be 2.5-4.0. The extraction time was 10 minutes and 20 minutes respectively. The concentrations of APCD and buffer were: Cr (Ⅲ): 1.2% and 0.04 ~ 0.2%, Cr (Ⅵ); 0.2% and 1%. The complexes in the extract are stable for at least 30 days and do not interfere with most metal ions. This method