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Determination of Calcium with Ion-Selective Electrode in Black Liquor from a Kraft Pulping Process

机译：牛皮纸制浆工艺中白酒中离子选择电极测定钙

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摘要

A solid-contact Ca2+-selective electrode was used to study speciation of calcium in black liquor. During extended time of operation the standard potential was found to change, but the sensitivity of the electrode, and the selectivity coefficients remained unchanged. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) measurements showed sodium sorption to the electrode membrane during the measurement in black liquor. Linearization of the complexometric titration curves were used to determine the concentrations of Ca2+, CaOH+ as well as weak and strong calcium complexes. With inductively coupled plasma optical emission spectrometry (ICP-OES), similar total calcium concentrations were obtained as by the EDTA titration.
机译：固态接触式Ca2 +选择电极用于研究黑液中钙的形态。在延长的操作时间内，发现标准电势发生变化，但是电极的灵敏度和选择性系数保持不变。激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）测量显示黑液测量过程中钠吸附到电极膜上。络合滴定曲线的线性化用于确定Ca2 +，CaOH +以及弱钙和强钙复合物的浓度。使用电感耦合等离子体发射光谱法（ICP-OES），可获得与EDTA滴定法相似的总钙浓度。

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