| pH、指示剂种类及用量对络合法滴定碳酸钙的影响 |
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| 引用本文： | 徐海龙,许莉莉,王芮,谷德贤,白东清.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,2016,37(1):9-15. |
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| 作者姓名： | 徐海龙 许莉莉 王芮 谷德贤 白东清 |
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| 作者单位： | 天津农学院水产学院，天津市水产生态及养殖重点实验室，天津 300384；,天津农学院水产学院，天津市水产生态及养殖重点实验室，天津 300384；中国海洋大学水产学院，山东 青岛 266003；,天津农学院水产学院，天津市水产生态及养殖重点实验室，天津 300384；上海海洋大学海洋科学学院，上海 201306；,天津市水产研究所，天津 300221,天津农学院水产学院，天津市水产生态及养殖重点实验室，天津 300384； |
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| 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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| 摘 要： | 为了探究指示剂的种类、用量以及和pH对EDTA络合法测定碳酸钙结果的影响,通过建立8种指示剂的回归曲线,研究不同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。结果表明,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使用液量也不相同,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;使用络合滴定法测定碳酸钙浓度时,以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。
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| 关 键 词： | 碳酸钙 络合滴定法 指示剂 PH |
| 收稿时间： | 2015/8/13 0:00:00 |
| 修稿时间： | 2016/2/27 0:00:00 |
Impacts of selection and amount of indicator and pH in complexometry to determination of calcium carbonate |
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| XU Hai-long,XU Li-li,WANG Rui,GU De-xian and BAI Dong-qing.Impacts of selection and amount of indicator and pH in complexometry to determination of calcium carbonate[J].Journal of Hydroecology,2016,37(1):9-15. |
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| Authors: | XU Hai-long XU Li-li WANG Rui GU De-xian and BAI Dong-qing |
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| Institution: | Department of Fishery Sciences, Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384,P.R. China;,Department of Fishery Sciences, Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384,P.R. China; College of Fisheries, Ocean University of China, Qingdao 266003, P.R.China;,Department of Fishery Sciences, Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384,P.R. China; College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, P.R.China;,Tianjin Fisheries Research Institute, Tianjin 300221, P.R.China and Department of Fishery Sciences, Tianjin Agricultural University, Tianjin Key Laboratory of Aqua-ecology and Aquaculture, Tianjin 300384,P.R. China; |
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| Abstract: | 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. |
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| Keywords: | calcium carbonate complexometry indicator pH |
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