【摘要】 研究了用显色剂ＰＡＮ－Ｓ分光光度法测定Ｚｎ（Ⅱ）的最佳条件。结果表明：ｐＨ值在８．３０～１０．００范围内Ｚｎ（Ⅱ）与ＰＡＮ－Ｓ形成３：１稳定配合物，该配合物的最大吸收波长为５３５ｍｍ，摩尔吸光系数为３．９２×１０４Ｌ．ｃｍ－１·ｍｏｌ－１；锌量在０～１００μｇ２５ｍｌ内符合朗伯－比耳定律；加入掩蔽剂可直接测定食品中的锌，回收率为９４％～１０５％。更多还原

【Abstract】 It studied that the best conditions for determination of Zinc have at Zinc reacts with PANS to form 3:1 stable complex is at 535nm with molar absorptivity being 3.9210 4 L.cm-1.mol-1. Beer’s Law is obeyed in the range of 0100g Zn()/25ml.THe method has been applied to the direct determination of Zinc in foods with sequestering agents. The recovery is 94%105%.更多还原