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本文以铝合金作试样,对络合滴定希土的金属指示剂及其与掩蔽剂的组合作了比较,拟订了用盐酸溶样,氢氧化钠和三乙醇胺沉淀分离希土,在六次甲基四胺缓冲液中,磺基水杨酸为掩蔽剂,偶氮胂Ⅲ为指示剂,用DTPA溶液滴定希土总量的方法。本法准确、简捷,回收率达99.6%。可测希土氧化物含量0.1～50%的各种铝合金。一试剂 20%六次甲基四胺溶液(用盐酸调至pH≈5.5) 0.01M DTPA溶液:称3.96克DTPA,加水500毫升,氨水调至溶解完全(pH7～8),水稀至1000毫
In this paper, aluminum alloy as a sample, the titration of complexing titration of metal indicator and its masking agent with a combination of comparison, prepared with hydrochloric acid solution, sodium hydroxide and triethanolamine precipitation separation of rare earth, six times Methyltetramine buffer, sulfosalicylic acid as a masking agent, arsenazo Ⅲ as an indicator, titration with DTPA solution total amount of soil. This law is accurate, simple, the recovery rate of 99.6%. Measurable earth oxide 0.1 ~ 50% of the various aluminum alloys. A reagent 20% hexamethylenetetramine solution (adjusted to pH≈5.5 with hydrochloric acid) 0.01M DTPA solution: Weigh 3.96g DTPA, add water 500ml, ammonia water to dissolve completely (pH7-8)