| pH、指示剂种类及用量对络合法滴定碳酸钙的影响 |
| Impacts of selection and amount of indicator and pH in complexometry to determination of calcium carbonate |
| 投稿时间：2015-08-13 修订日期：2016-02-27 |
| DOI：10.15928/j.1674-3075.2016.01.002 |
| 中文关键词:碳酸钙 络合滴定法 指示剂 PH |
| 英文关键词:calcium carbonate complexometry indicator pH |
| 基金项目:农业部北方海水增养殖重点实验室基金资助（2014MSENCKF09），天津市津南区科技计划项目（2014NY009） |
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| 中文摘要: |
| 为了了解指示剂的种类、用量，和pH对EDTA络合法测定碳酸钙结果的影响，本文研究了8种指示剂对回归曲线建立，不同pH条件下10种指示剂的显色以及14种指示剂不同用量对测定碳酸钙含量消耗EDTA量的影响。8种指示剂均能较好反映滴定溶液中碳酸钙含量间的关系，拟合的曲线R2均大于0.999，。指示剂种类及其用量不同，消耗的EDTA使用液量亦不同，且在不同pH条件下，指示剂所显示的颜色不同，从而影响滴定结果。目前的研究表明，使用络合滴定法测定碳酸钙浓度时，溶液中碳酸钙的质量浓度低于0.5%为宜，紫尿酸胺-萘酚绿B作为指示剂用于EDTA络合法滴定优于其他指示剂。 |
| 英文摘要: |
| In order toFor increase the better understanding of the impacts of the kinds of indicators, dosage level of indicators and amount of indicator and pH on the measured measurement value of calcium carbonate by means of complexometry, the fitted carve based on eight kinds of indictors, the color of ten eleven kinds of indicators with the different pH, and the consumption of EDTA in theto titration eof calcium carbonate under three dosage levels used amount of fourteen indicators were studied. The results showed that all standard carve curves on the base of eight kinds of indicators couldan express well the relation between consumption of EDTA and the content of calcium carbonate, and the R2 of all fitted functions are over than 0.999. The content of calcium carbonate wais different with the kinds of indicators, as well as used amount, and, the color of indicators is changed along with the variedvarious pH level. The present results indicated that the optimal mass concentration of calcium carbonate is not more than 0.5%, and the murexide-naphthol green B used as indicator wais better than others to in the determination ofe the concentration of calcium carbonate by means of complexometry. |
| 徐海龙,许莉莉,王芮,谷德贤,白东清.2016.pH、指示剂种类及用量对络合法滴定碳酸钙的影响[J].水生态学杂志,37(1):9-15. |
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