本文采用石墨炉原子吸收光谱法（ＧＦＡＡＳ）测定海水甲苯抽提液中的三丁基锡。文中考察了１４种基体改进剂对灵敏度的影响，选出了能显著提高测定灵敏度的Ｃａ－Ｃｒ基体改进剂，以０．５／０．１ｍｇ／ｍｌ的浓度比例对８个实样进行了测定，其相对标准偏差（ＲＳＤ）为３％（６３ｎｇ／ｍｌ，ｎ＝１１），其特征浓度为７ｐｇ，回收率在８８％～１０４％之间。成功地应用于近海沉积物对三丁基锡吸附规律的研究。 In this paper, graphite furnace atomic absorption spectrometry (GFAAS) determination of tributyltin in seawater toluene extract. The effects of 14 kinds of matrix modifiers on the sensitivity were investigated in this paper. The Ca-Cr matrix modifier, which can significantly improve the sensitivity of the assay, was selected and eight samples were determined at a concentration of 0.5 / 0.1 mg / ml The relative standard deviation (RSD) was 3% (63 ng / ml, n = 11). The characteristic concentration was 7 pg and the recovery was between 88% and 104%. Study on the adsorption of tributyltin on offshore sediments successfully.