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测定硝酸盐浓度常用的方法是在强碱性介质中用锌或铝作还原剂,使硝酸根还原为氨并用酸吸收,再对铵盐进行定量测定。也有采用弱碱性介质,用新制的镉汞齐作还原剂,将硝酸根还原为亚硝酸根,利用亚硝酸根的显色反应进行比色测定。这两种方法均手续繁琐、费时,且对酸溶解的矿石不能直接测定。为了解决在酸性介质中直接测定硝酸盐的浓度,作者以钛盐钝化液中硝酸的测定方法为基础,进行了条件试验及干扰试验,使其适用于各种酸性溶液中硝酸盐浓度
The most common method for determining nitrate concentration is to use zinc or aluminum as a reducing agent in a strongly basic medium to reduce nitrate to ammonia and to absorb it with acid and then to determine the ammonium salt quantitatively. Also using a weak alkaline medium, with a new cadmium amalgam as a reducing agent, the nitrate was reduced to nitrite, the use of nitrite color reaction for colorimetric determination. Both procedures are cumbersome and time consuming, and can not be directly determined for acid-dissolved ores. In order to solve the direct determination of nitrate concentration in acidic medium, the author based on the determination of nitric acid in titanium salt passivation solution, the conditions of the test and interference test, making it suitable for a variety of acidic solution nitrate concentration