【摘要】 <正> 研究微量元素在海水中的存在形态是海洋化学上比较重要的课题之一,对了解微量元素在海洋中的循环具有重要的意义。关于锌在海洋中的存在形态曾有过详细的评论。 海水中的无机锌主要以Zn⁺、Zn（OH）⁺及Zn（CO₃）⁰的形式存在。其含量范围一般在1—50μg/L之间,平均值约为3μg/L.近岸及河口区含量较高,个别测定值可高达300—400μg/L。关于海水中锌的测定方法如ASV法和分光光度更多还原

【Abstract】 The chemical forms of zinc and its distribution in the surface water of the Northeast Jiaozhou Bay (25 stations) have been studied. The ASV method and spectrophotometry with dithizone extraction were employed in. untreaded and treated sea water to identify forms of zinc in sea water. We suggest that zinc in sea water can be divided into five forms by following ways.Particulate zinc (Znp). One liter sea water sample was filtrated through a membrane filter. The remains on the filter was digested in a mixture of HNO3 and HClO4, and then the content of particulate zinc was obtained by ASV.ZnAsv (labile zinc plus ionic zinc). They were determined by ASV method directly.ZnH2Dz represent weak bound zinc (ZnB) plus ZnAsv.They were obtained by spectrophotometry with dithizone extraction directly.ZnASV plus Znw and bound zinc(ZnB) are the total soluble zinc(ZnTS). The water sample was digested with HNO3 and heated till boiling, and the Znrs was obtained by spectrophotometry.ZnW=ZnH2Dz-ZnASVZnB=ZnTS-ZnH2DZ∑Zn=ZnTS + ZnpResults show high values near the coast area. The ∑Zn mean value is 20.7μg/L(6.9-39.6μg/L); ZnP 2.70μg/L(0.4-6.5μg/L), ZnP/∑Zn = 13.0% ; ZnASV4.13μg/L(1.7-9.6μg/L), ZnASV/∑Zn=20.09%; ZnW 5.49μg/L (1.3-19.6 μg/L),ZnW/∑Zn=26.5%;ZnB = 8.42μg/L(1.47-20.3μg/L),ZnB/∑Zn=40,7%; ZnTS 18.0μg/L(5.3-34. 5μg/L), ZnTS/∑Zn = 87.09%. The results show that bound zinc is the main form among the whole sea water of the Northeast Jiaozhou Bay, and its content is about half of total souble zinc (ZnB/ZnTS = 46. 7% ), which is agreed with Fukai’s results.更多还原