【摘要】 本文研究了新钙试剂间羧基偶氮羧与钙的显色反应的条件,在柠檬酸介质中,试剂与钙形成2:1的配合物,在700nm 波长处具有最大吸收。摩尔吸光率为1.7×10~5。钙量在0.5～5.0μg/25ml 范围内符合比耳定律。显色体系有很好的选择性。可不经分离,直接测定钨酸钠中痕量的钙。更多还原

【Abstract】 The conditions of the reaction between calcium and the new chromogenic reagent-mCCA are studied.In citric acid medium,calcium forms with mCCA a 1:2 complex,which gives an aosorption peak at 700nm with the molar absorptivity of 1.7×10~5.Beer’s law is obeyed in the range of 0.5～5.0μg calcium per 25ml.The selectivity of the reaction is fairly good.Trace amounts of calcium in sodium tungstate can be determined directly in aqueous solution without any separation.The accuracy and precision are both satisfactory.更多还原