本文研究了以硝酸镍 硝酸镧为基体改进剂 ,石墨炉原子吸收法测定硫磺中痕量砷 ,还研究了硫磺的控温电热酸消解和高压坩埚酸消解。试验表明 ,硫磺试样经硝酸 高氯酸消解后测砷 ,用硝酸镍 硝酸镧基体改进剂 ,比只用硝酸镍基体改进剂 ,灵敏度明显提高。试样的分析结果与HG ICP AES相吻合 ,方法检出限为0 0 34 μg·mL- 1 ,RSD≤ 2 1% (n =4) ,回收率 97 5 %～ 110 %。 In this paper, the determination of trace arsenic in sulfur by graphite furnace atomic absorption spectrometry was studied using lanthanum nitrate nitrate as matrix modifier and temperature controlled hot-acid digestion and high-pressure crucible acid digestion of sulfur. The test shows that the sulfur sample after arsenic nitration perchloric acid digestion test, with nickel nitrate nitrate nitrate lanthanum base modifier, compared with only nickel nitrate matrix modifier, the sensitivity was significantly improved. The analytical results of the sample were in good agreement with those of HG ICP AES. The detection limits were 0 0 34 μg · mL-1, RSD≤ 21% (n = 4), and the recoveries were 97 5% -1 110%.