EDTA络合滴定法快速测定镁砂中的镁含量  

Rapid Determination of Magnesium content in Magnesia by EDTA Titration Method

作　　者：沈洁 SHEN Jie(Yingkou Magnesite Chemical Ind group Co.,Ltd.,Yingkou Liaoning 115100,China)

机构地区：[1]营口菱镁化工集团有限公司检测中心,辽宁营口115100

出　　处：《辽宁化工》2025年第4期703-705,共3页Liaoning Chemical Industry

摘　　要：镁砂试样经盐酸-硝酸混合酸溶解,以三乙醇胺,酒石酸钾钠和EGTA为掩蔽剂,加入氨水-氯化铵缓冲溶液调节溶液p H值为10.0,以酸性罗兰K-萘酚绿B为指示剂,用EDTA标准滴定溶液直接滴定镁含量。通过实验确定了掩蔽剂的加入量,并采用实验方法对镁砂标准样品中的镁含量进行多次测量,检测结果与认定值相符,相对标准偏差为0.040%~0.110%(n=7)。研究方法可操作性强,可快速、准确地测定镁砂中的镁含量。The magnesia sample was dissolved with hydrochloric-nitric acid mixture,triethanolamine,potassium sodium tartrate and EGTA solution were used as masking agents,the pH value of the solution was adjusted to about 10 using ammonia-ammonium chloride buffer solution,and then determined directly the magnesium content with EDTA standard titration solution using acid chrome blue Knaphthol green B as indicator.The addition amount of masking agent were obtained by experiments.The magnesium content of the magnesia standard sample was measured times by an experimental method.The test results were in agreement with the certified values,the relative standard deviation were between 0.040%and 0.11%(n=7).The method is operable and it can be used to determine magnesium content in magnesia quickly and accurately.

关 键 词：镁砂 镁 络合滴定 EGTA掩蔽 

分 类 号：TQ175.1[化学工程—硅酸盐工业]