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Use of a carbon paste electrode modified with spinel-type manganese oxide as a potentiometric sensor for lithium ions in flow injection analysis

机译:尖晶石型氧化锰修饰的碳糊电极在流动注射分析中作为锂离子电位传感器的用途

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摘要

A potentiometric sensor constructed from a mixture of 25% (m/m) spinel-type manganese oxide (lambda-MnO2), 50% (m/m) graphite powder and 25% (m/m) mineral oil is used for the determination of lithium ions in a flow injection analysis system. Experimental parameters, such as pH of the carrier solution, flow rate, injection sample volume, and selectivity for Li+ against other alkali and alkaline-earth ions and the response time of this sensor were investigated. The sensor response to lithium ions was linear in the concentration range 8.6 x 10(-5) - 1.0 x 10(-2) mol L-1 with a slope 78.9 +/- 0.3 mV dec(-1) over a wide pH range 7 - 10 (Tris buffer), without interference of other alkali and alkaline-earth metals. For a flow rate of 5.0 mL min(-1) and a injection sample volume of 408.6 muL, the relative standard deviation for repeated injections of a 5.0 x 10(-4) mol L-1 lithium ions was 0.3%.
机译:由25%(m / m)尖晶石型氧化锰(λ-MnO2),50%(m / m)石墨粉和25%(m / m)矿物油的混合物构成的电位传感器流动注射分析系统中的锂离子分析研究了载液的pH值,流速,进样量以及Li +对其他碱金属和碱土金属离子的选择性以及该传感器的响应时间等实验参数。传感器对锂离子的响应在8.6 x 10(-5)-1.0 x 10(-2)mol L-1的浓度范围内呈线性关系,在宽pH范围内斜率78.9 +/- 0.3 mV dec(-1) 7-10(Tris缓冲液),不受其他碱金属和碱土金属的干扰。对于5.0 mL min(-1)的流速和408.6μL的进样量,重复注射5.0 x 10(-4)mol L-1锂离子的相对标准偏差为0.3%。

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