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首页> 外文期刊>Electroanalysis >Determination of Nitrates in Water Samples by In-Electrode Coulometric Titration in Copper Coated Porous Vitreous Carbon Electrode
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Determination of Nitrates in Water Samples by In-Electrode Coulometric Titration in Copper Coated Porous Vitreous Carbon Electrode

机译：镀铜多孔玻璃碳电极中电极内库仑滴定法测定水样中的硝酸根

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摘要

Nitrate in water samples was determined by in-electrode coulometric titration in porous electrode made of vitreous carbon particles coated with copper. The sample was mixed with diluted sulfuric acid containing 1 mmol/L hydrochloric acid, the solution was filled into the cell and electrode and the nitrate ions were directly reduced by constant current to ammonium ions. The stoichiometry of the electrode reaction was found by coulometric and photometric measurements. The detection limit and precision were found to be 0.2 mg/L and 1.7 %, respectively. The interfering effect of high chloride contents was eliminated by precipitating chlorides with silver sulfate. The method was applied for the analysis of various water samples and beverages. The results were in good agreement with data from isotachophoretic and photometric measurements.
机译：通过电极内库仑滴定法在由覆有铜的玻璃碳颗粒制成的多孔电极中测定水中样品中的硝酸盐。将样品与含有1 mmol / L盐酸的稀硫酸混合，将溶液填充到电解槽和电极中，并通过恒定电流将硝酸根离子直接还原为铵离子。电极反应的化学计量通过库仑法和光度法测量发现。检出限和精密度分别为0.2 mg / L和1.7％。通过用硫酸银沉淀氯化物，消除了高氯化物含量的干扰作用。该方法适用于各种水样和饮料的分析。结果与等速电泳和光度法测量的数据吻合良好。

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