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利用微分电位溶出分析法研究了海水中痕量铋（III）的最适测定条件。结果表明，实验条件选择电解电位（E）为-1．10V，溶出上限电位（E上）为-0.70V，溶出下限电位（E下）为-0．00V，工作电极旋转速度2500rpm.洗电极时间和富集时间分别为30s和600s。适宜的盐度和酸度为5．8－29．0×10-2mol／L和1．00-2.00×10-mol／LHNO3。对在海水中加入5μg／L铋（III）的样品8次测定的相对标准偏差为53％。校正曲线方程为Y=4.77＋55X,相关系数（γ）为0．9993。对青岛沿岸海水测定的加入回收率为96．5％。1994年利用该方法测定青岛沿岸海水中铋（III）的浓度为0．017－0．103μg／L。
The optimum conditions for the determination of trace bismuth (III) in seawater were studied by differential potentiometric stripping analysis. The results show that the experimental conditions select the electrolysis potential (E) of -1.10V, the upper limit of dissolution (E) is -0.70V, the lower limit of dissolution (E) is -0.00V, the working electrode rotation speed is 2500rpm. Time and enrichment time were 30s and 600s. Suitable salinities and acidities are 5.8-29.0 x 10-2 mol / L and 1.00-2.00 x 10-mol / L HNO3. The relative standard deviation of the eight determinations of samples containing 5 μg / L bismuth (III) in seawater was 53%. The calibration curve equation is Y = 4.77 + 55X, the correlation coefficient (γ) is 0.9993. The recovery rate of seawater in Qingdao was 96.5%. The method was used to determine the concentration of bismuth (III) in seawater of Qingdao coast in 1994 to 0.017-0.103μg / L.