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首页> 外国专利> VOLTAMMETRIC METHOD FOR THE DETERMINATION OF HYDROGEN PEROXIDE IN AQUEOUS SOLUTIONS ON A GRAPHITE ELECTRODE MODIFIED WITH COLLOIDAL SILVER PARTICLES

VOLTAMMETRIC METHOD FOR THE DETERMINATION OF HYDROGEN PEROXIDE IN AQUEOUS SOLUTIONS ON A GRAPHITE ELECTRODE MODIFIED WITH COLLOIDAL SILVER PARTICLES

机译：伏安法测定胶体银微粒修饰石墨电极上水溶液中的过氧化氢。

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FIELD: chemistry.;SUBSTANCE: invention relates to analytical chemistry, namely to method for determining the content of hydrogen peroxide in aqueous solutions by cyclic voltammetry using a three-electrode cell, where a graphite electrode modified with colloidal silver particles is used as an indicator electrode. Present invention determines hydrogen peroxide concentrations at a value of 1⋅10-10 M, and formation limit of 0.7⋅10-10 M. In a three-electrode cell filled with a solution of the background electrolyte 10 ml of tap water with the addition of 1 ml of 1 M NaOH, add 20 mcl of the first additive of unknown concentration of hydrogen peroxide, after which the vibrational stirring of the solution is performed for 20 s, a branch of the cyclic volt-ampere curve is recorded at a scan rate of 40 mV/s and a potential of -1.0 to +2.0 V, after which the cathode maximum is recorded on the current-voltage curve in the potential range from +0.4 to 0.0 V; further 50 mcl of the second additive of the certified mixture of hydrogen peroxide concentration 1⋅10-10 M, vibration stirring of the solution is carried out for 20 seconds, after which an anode branch is recorded, to the atomic branch of the cyclic volt-ampere curve at a sweep speed of 40 mV/s and a potential of -1.0 and +2.0 V, then the cathodic voltage-current dependence is recorded to increase the cathode maximum by a factor of 2 with respect to the first additive in the potential range from +0.4 to 0.0 V.;EFFECT: invention allows to lower the limit and the lower limit for determining the content of hydrogen peroxide in aqueous solutions.;1 cl, 2 dwg, 2 ex
机译：技术领域本发明涉及分析化学，即涉及使用三电极池通过循环伏安法测定水溶液中过氧化氢含量的方法，其中以胶体银颗粒修饰的石墨电极为指示剂。电极。本发明确定过氧化氢浓度为1⋅10 -10 M，形成极限为0.7⋅10 -10 M。在装有三电极的三电极电池中往背景电解液中加入10毫升自来水和1毫升1 M NaOH，再加入20毫升不明过氧化氢浓度的第一添加剂，然后对该溶液进行振动搅拌20 s，以40 mV / s的扫描速率和-1.0到+2.0 V的电位记录循环伏安曲线的一个分支，然后在电流-电压曲线上以+的电位范围记录阴极最大值0.4至0.0 V;再将50 mcl的过氧化氢浓度为1⋅10 -10 M的认证混合物的第二种添加剂振动20秒钟，然后记录阳极分支，在40 mV / s的扫描速度和-1.0和+2.0 V的电势下，通过循环伏安曲线的原子分支，则记录了阴极电压-电流相关性，从而将阴极最大值增加了2倍，相对于第一添加剂的电位范围为+0.4至0.0 V .;效果：本发明可以降低确定水溶液中过氧化氢含量的下限和下限.1 cl，2 dwg，2 ex

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