三价铬及六价铬是食品中微量元素铬的两种主要存在价态。
Trivalent chromium and hexavalent chromium are two main states of the chromium in foods.
采用化学镀技术在预处理后的金属表面上制备镍磷二元和镍铜磷三元镀片，用X射线光电子能谱分析仪和扫描电镜分别对镀片表面的元素价态、组成及镀片表面的形貌进行表征。
The coatings of nickel-phosphor and nickel-copper-phosphor are prepared on the pretreated metal surface by electroless plating technology. The coating surface has been characterized by XPS and SEM.
六价铬对总铬比率低于3%，是最次要的形态；三价铬对总溶解铬的比率在80%以上，所以三价铬在溶解态中占主要形态。
Trivalent chromium in dissolved state occupies a principal position, so that ratio of trivalent chromium to total dissolved chromium is more than 80%.
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