| 摘要: |
| 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5.8-29.0×10-2 mol/L和1.00-2.00×10-2 mol/L HNO3。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0.017－0.103 μg/L。 |
| 关键词: 铋 微分电位溶出分析 海水 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，38970591号 |
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| DIFFERENTIAL POTENTIOMETRIC STRIPPING ANALYSIS FOR BISMUTH (III) IN SEAWATER |
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Yuan Youxian, Qu Keming, Zhang Duxi
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Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Science,Qingdao 266071
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| Abstract: |
| The analytical procedure established in this study for determination of bismuth(III) in seawater by differential potentiometric stripping analysis has been established showed discovered that pretreatment and plating mercury of working electrode were key steps for successful results. Mercury film obtained at 40mg/L Hg was suitable for determination of bismuth(III) at more than 1.00μg/L. Mercury film obtained at 10mg/L Hg was of higher sensitivity. The selected experimental conditions were: electrolysis potential (E) -1.10V; stripping upper potential (Eupper)-0.70V, the stripping lower potential (Elower) -0.00V; working electrode rotary speed 2500 rpm. The washing electrode time and the preconcentration time were 30s and 600s, respectively. The suitable salinity and acidity of seawater were 5.8 - 29.0 and 1.00 - 2.00×102mol/L HNO3. The relative standard deviations was 5.3% (n = 8) for seawater sample at 0.5 μg/L Bi(III) of added concentration. The calibration curve equation was Y= 4.77+ 55X; correlative factor (γ) of 0.9993 was obtained. The analytical procedure has been applied to the determination of trace bismuth(III) in Qingdao coastal seawaters with 96.5% recovery rate. In 1994, the concentration of bismuth(III) in Qingdao coastal seawaters was 0.017 - 0.103μg/L. |
| Key words: Bismuth, Differential stripping analysis, Seawater |
