天然水中黄腐酸(Fulvic Acid简称FA)的含量为0.X-X.10ppm。黄腐酸与重金属离子有鳌合作用,降低了重金属的毒性,影响重金属的迁移、转化。FA对环境容量的研究、地方病病因的探讨等,已引起有关学者的关注。本文选定0.25M硫酸钾、2.0×10~(-2)M硫酸铜、0.8×10~(-3)M磷酸三丁酯(TBP)为底液(pH=4.0-5.0)。用普通极谱仪能简便、灵敏,以良好的选择性测定FA,回收率在94％以上,比Sohr法浓度线性范围增大了一倍。 Natural water fulvic acid (Fulvic Acid referred to as FA) content of 0.X-X.10ppm. Fulvic acid and heavy metal ions chelating, reducing the toxicity of heavy metals, affecting the migration and transformation of heavy metals. FA research on environmental capacity, the etiology of endemic diseases, has attracted the attention of scholars. In this paper, 0.25 M potassium sulfate, 2.0 × 10 -2 M copper sulfate and 0.8 × 10 -3 M TBP were selected as the substrate solution (pH = 4.0-5.0). FA can be determined easily and sensitively by ordinary polarography with good selectivity. The recovery rate is over 94%, which is twice as much as the linear range of Sohr concentration.