络合滴定钙和镁,往往需要使用掩蔽剂来掩蔽干扰离子。文献介绍了好几种掩蔽剂,但由于某些掩蔽剂的剧毒性,价钱昂贵或掩蔽能力差,故使用时受到限制。Leg radi提出丙酮氰醇受到重视,目前有使用此掩蔽剂于镍镁合金和铝合金络合滴定测镁。本文试验了国内外经常使用的六种掩蔽剂(L-半膀胱氨基酸、硫代乙醇酸、二巯基丙醇、B-巯基丙酸、 Complexometric titration of calcium and magnesium often requires the use of masking agents to mask interfering ions. Several masking agents are described in the literature, but are limited in use due to the high toxicity, high cost, or poor masking ability of certain masking agents. Leg radiology puts emphasis on acetone cyanohydrin. Magnesium has been used for the complexometric titration of nickel-magnesium alloy and aluminum alloy with this masking agent. This paper tested six masking agents commonly used at home and abroad (L-half bladder amino acids, thioglycolic acid, dimercaptopropanol, B-mercaptopropionic acid,