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Detection of Free and Total Calcium Concentration byPolymeric Membrane Calcium-Selective Electrodes
Authors
刘淑文
尹坦姬
秦伟
Publication date
27 September 2016
Publisher
Abstract
利用聚合物膜钙离子选择性电极,通过使用不同的内充液,分别实现了游离钙和在络合剂EDTA和腐殖酸存在下总钙浓度的检测。结果表明,采用0.1mol·L-1 NaCl+1×10-3 mol·L-1 CaCl2作为内充液的电极,可以实现低至1×10-6 mol·L-1游离钙活度的检测;而采用1×10-3 mol·L-1 CaCl2+5×10-2 mol·L-1Na2EDTA(pH=9.0)作为内充液的电极,在1×10-61×10-5 mol·L-1 Ca2+浓度范围内有超能斯特现象发生,电位差值为180mV,且在该范围内电位响应与总钙浓度呈线性相关,与游离钙活度无关。该研究为进一步开展形态分析提供了一种简单、有效的技术手段。 
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Last time updated on 04/07/2017