| 摘要: |
| 测定 SO42-方法很多,过去在常规分析中用的 BaSO4重量法,其准确度虽高,但操作繁琐冗长,在大批样品的分析工作中不便使用。其它如联苯胺法、四羟基苯醌法、离子交换法及用铅离子选择电极指示的电位滴定法等亦有其明显的缺点,特别在 SO42-含量低时,测 |
| 关键词: 相对误差 间接滴定法 测定结果 比浊法 标准溶液系列 土壤浸出液 重量法 吸收值 毫升 准确度 |
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| 基金项目: |
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| CONDITIONS OF EDTA TITRAMETRIC METHOD AND BARIUM SULPHATE TURBIDIMETRIC METHOD FOR DETERMINATION OF SOIL WATER SOLUBLE SULPHATE |
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| Abstract: |
| The present paper deals with the investigations on the securing of optimal concentration of sulphate ion and conditions of precipitation of BaSO4. Experimental results showed that the precision and sensitivity cou- ld be raised by the following ways.(1)The optimal concentration range of sulphate ion in EDTA titrametric method is 5-30mg SO42-/100ml.Relative errors in this concentration range were less than 1%.(2)The amount of precipitant(BaCl2)added in the EDTA titra- metric method should be 50-100% in... |
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