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目前,海水中痕量钍测定的报导不多,由于海水成份较为复杂,钍含量又极微,现有测定多采用放射性分析。本文在痕量钚测定工作的基础上,建立了一种海水中痕量钍的分光光度测定法。我们的实验首次证明,碱式碳酸镁对水相中痕量钍是优良的吸附共沉淀剂。在此基础上研究了海水中痕量钍的碱式碳酸镁浓集、TBP萃取和偶氮胂Ⅲ分光光度测定法。此法能测定10~(-6)～10~(-8)g/l数量级范围内的钍(回收率95％以上),精密度较高(相对标准偏差≤14％),最低检出浓度达到5.0×10~(-8)g/l,一般海水中的杂质不干扰钍的测定。
At present, there is not much report on the determination of trace thorium in seawater. Due to the complexity of seawater components and the extremely small content of thorium, radioactive analysis has been mostly used in the existing measurement. Based on the determination of trace amounts of plutonium, this paper established a spectrophotometric method for the determination of trace thorium in seawater. Our experiments show for the first time that basic magnesium carbonate is an excellent adsorbent coprecipitant for trace amounts of thorium in the aqueous phase. Based on this, the basic magnesium carbonate concentration, TBP extraction and arsenazo (Ⅲ) spectrophotometry of trace amounts of thorium in seawater were studied. The method can determine thorium (the recovery is more than 95%) within the range of 10 -6 to 10 -8 g / l, the precision is high (relative standard deviation ≤14%), the lowest detection concentration Reached 5.0 × 10 ~ (-8) g / l, the general seawater impurities do not interfere with the determination of thorium.