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作 者:李昌丽[1] 周蕾[1] 张彦甫[1] 蒋晓光[1] 褚宁[1] 王艳君[1] 王彩云[1]
机构地区:[1]鲅鱼圈出入境检验检疫局,辽宁营口115007
出 处:《广州化工》2015年第24期124-126,153,共4页GuangZhou Chemical Industry
基 金:国家质检总局科研项目(2009IK072);中国检验检疫行业标准制定项目(2011B074)
摘 要:以盐酸、硝酸、氢氟酸溶解红土镍矿样品,加高氯酸冒烟除去硅和氟,采用六次甲基四胺-铜试剂消除共存离子干扰,在pH=10时,以铬黑T作指示剂,用Na2EDTA标准滴定溶液滴定钙和镁的合量;在pH=12时,以钙羧酸作指示剂,用Na2EDTA标准滴定溶液滴定钙的含量,用差减法求得镁的含量。氧化镁质量分数在5.0%~30.0%范围内,该方法加标回收率为99.4%~100.0%,重复性及再现性方程分别为r=0.005m+0.0899和R=0.0091m+0.3553。此方法适合于测定氧化镁含量在5.0%~30.0%的红土镍矿。The laterite nickel ore sample was dissolved with hydrochloric acid,nitric acid,hydrofluoric acid. Ca2 +and Mg2 +were titrated by Na2 EDTA after got rid of coexisting ions detection with hexamethylenetetramine and sodium diethyldithiocarbamate at pH 10,using the chrome black T indicator; Ca2 +was titrated by Na2 EDTA at pH 12,using the calcon carboxytic acid indicator,Mg2 +was calculated by subtraction method. Magnesia content range was from 5. 0% to30. 0%,the recoveries rang was from 99. 4% to 100. 0%,the equation of repeatability and reproducibility were r =0. 005 m + 0. 0899 and R = 0. 0091 m + 0. 3553. This method was applicable for the determination of laterite nickel ore with magnesia content of 5. 0% ~ 30. 0%.
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