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提出了采用示波极谱法测定馏分油及石油产品中元素硫的方法。支持电解液是含有0.5m ol/L醋酸和0.3 m ol/L醋酸铵体积比为1∶1的甲苯-甲醇溶液。在此介质中,饱和甘汞电极的峰电位为- 0.61V。该方法灵敏度高,当元素硫浓度为0.1 m g/L时仍可以看到明显峰电流;精密度和准确度较好,对1 m g/L元素硫的测定,标准偏差为0.02;元素硫浓度在0~4 m g/L浓度范围与极谱峰电流呈线性关系。
A method for the determination of elemental sulfur in distillate oil and petroleum products by oscillopolarography was proposed. The supporting electrolyte is a toluene-methanol solution containing 0.5 mol / L acetic acid and 0.3 mol / L ammonium acetate in a 1: 1 volume ratio. In this medium, the peak potential of the saturated calomel electrode is -0.61V. The method has high sensitivity and obvious peak current can still be seen when elemental sulfur concentration is 0.1 m g / L. The precision and accuracy are good. The standard deviation of elemental sulfur of 1 m g / L is zero. 02; elemental sulfur concentration in the range of 0 ~ 4 m g / L concentration and polarographic peak current was linear.