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首页> 外文会议>International Mineral Processing Congress >Simultaneous Catalytic Spectro-photometric Determination of Nitrite and Nitrate in Flour and Water with Flow Injection Analysis
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Simultaneous Catalytic Spectro-photometric Determination of Nitrite and Nitrate in Flour and Water with Flow Injection Analysis

机译：流动注射同时催化光度法测定面粉和水中的亚硝酸盐和硝酸盐

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The nitrate content is an important factor for environmental water samples and flour.In a 0.35 mol/L H2SO4 solution,NO-2 has a strong catalyzing function on the decoloudzation of Gallocyanine (GC) oxidated by NaBrO3.Based on this,a novel method was developed to measure the NO-2 and NO-3 concentrations in water and flour.The flow injection technology was introduced into the analysis system.A single-valve dual- cingulums to inject which the Copperized-Cadmium slice and the reduction zone are isolated. The optimum solution for this method contains 1.48×10-4 mol/L GC,0.06 mol/L NaBrO3 and 0.2 mol/L of NH4Cl.Two empirical equations were proposed to calculate the NO-2 and NO-3 concentrations based on the measured signals.It can be used to measure NO-2 of from 0.001 mg / L to 2.0 mg/L and NO-3 of from 0.002 mg / L to 2.5 mg/L.The measurement frequency can be up to 20 samples / h.The relative standard deviation for eleven samples is less than 5%.
机译：硝酸盐含量是影响环境水样和面粉的重要因素。在0.35 mol / L的H2SO4溶液中，NO-2对NaBrO3氧化的花青素（GC）的脱钩反应具有很强的催化作用。开发了用于测量水和面粉中NO-2和NO-3浓度的方法。流动注射技术被引入分析系统中。 。该方法的最佳溶液为1.48×10-4 mol / L GC，0.06 mol / L NaBrO3和0.2 mol / L NH4Cl。根据测量结果，提出了两个经验方程式来计算NO-2和NO-3的浓度。可以测量0.001 mg / L至2.0 mg / L的NO-2和0.002 mg / L至2.5 mg / L的NO-3，测量频率最高可达20个样本/小时。 11个样品的相对标准偏差小于5％。

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