铬酸钡沉淀分离硫酸亚铁铵滴定法测定硅铝钙钡合金中钡  

Determination of Barium in Silicon-aluminum-calcium-barium Alloy by Ammonium Ferrous Sulfate Titrimetry

作　　者：董洪壮[1] 沈彬彬[1] 孙凤燕[1] 董丙成[1] 

机构地区：[1]莱芜钢铁集团有限公司技术研发中心

出　　处：《莱钢科技》2010年第3期59-61,共3页Laigang Science & Technology

摘　　要：试样溶解后,以Ca-EDTA溶液掩蔽铁、铝等干扰离子,在pH值5.5～5.9的乙酸-乙酸钠缓冲溶液介质中,加重铬酸钾溶液使钡生成铬酸钡沉淀,过滤使钡与钙、铁、铝等干扰离子分离。用盐酸溶解铬酸钡沉淀,在硫磷混酸介质中,以N-苯代邻氨基苯甲酸为指示剂,用硫酸亚铁铵标准溶液滴定至试样由紫红色转变为浅黄棕色为终点,根据所消耗的硫酸亚铁铵标准溶液的体积,计算钡的百分含量。With the sample dissolved, with Ca-EDTA solution to mask disturbing ions like iron and aluminum, in acetic acid-sodium acetate buffered solution medium with a pH value of 5.5 to 5.9, potassium dichromate solution was added to generate barium chromate precipitation and filtered to separate the disturbing ions such as calcium, iron and aluminum. Hydrochloric acid was used to dissolve barium chro- mate as precipitate, in mixed medium of sulfuric acid and phosphoric acid, with N-phenylated anthrani- late as an indicator, the standard solution of ammonium ferrous sulfate was used to titrate the sample from amaranth to light yellow brown which was an end. According to the volume of the consumed standard solution of ammonium ferrous sulfate, the content of barium was calculated.

关 键 词：硅铝钙钡合金 重铬酸钾 铬酸钡沉淀 干扰离子分离 用盐酸溶解 硫酸亚铁铵滴定法 

分 类 号：X131.2[环境科学与工程—环境科学]