本文采用自己合成的α—庚基吡啶萃取富集微量金,试验了萃取酸度、时间、水相体积、萃取剂浓度、硫脲洗脱及伴生离子影响等条件,拟定了萃取富集石墨炉原子吸收测定微量金的方法.本法适用于地质样品中及选矿尾矿中0.001～0.×ppm品位金的测定.当标准金量为0.012ppm时,测定12次,变动系数为3.03%;当样品中金量为0.013ppm时,测定4次,变动系数11.9%.本法检出限0.2纳克/毫升,绝对灵敏度11.8皮克1%吸收. In this paper, we extracted and enriched trace gold with α-heptylpyridine synthesized by ourselves and tested the conditions of extraction acidity, time, aqueous phase volume, extractant concentration, the influence of thiourea elution and associated ions, Absorption determination of trace gold method. This method is suitable for geological samples and dressing tailings 0.001 ~ 0. × ppm grade gold determination. When the standard gold content of 0.012ppm, the determination of 12 times, the coefficient of variation of 3.03%; when The sample gold 0.013ppm, measured 4 times, the coefficient of variation of 11.9%. The detection limit of 0.2 ng / ml, the absolute sensitivity of 11.8 pg 1% absorption.