以钢样和碳棒分别作阳极和阴极,将阴离子交换膜置于两极之间,建立了一种新的电解法采集钢样.选择合适的电解质和电解电流使电流效率为100%,由钢的牌号确定其电化摩尔质量,用 Faraday 定律 m=kIt直接计算采集钢样的质量.文中讨论了该采样原理、近似电化摩尔质量的确定及误差和不用标准钢样绘制磷工作曲线的方法.33~#和45~#钢中磷用铝蓝光度法测定的结果分别是0.0058%和0.0170%,与标准值一致. A steel and carbon rod were used as the anode and the cathode, respectively, and the anion exchange membrane was placed between the two poles to establish a new electrolytic method to collect the steel sample.Selecting the appropriate electrolyte and electrolysis current, the current efficiency was 100% , And the Faraday’s law m = kIt is used to directly calculate the quality of the collected steel samples.This sampling principle, the determination of the approximate electrochemical molar mass and the error and the method of plotting the phosphorus working curve without the standard steel samples are discussed in this paper.33 ~ # And 45 ~ # phosphorus phosphorus aluminum blue spectrophotometric determination of the results were 0.0058% and 0.0170%, consistent with the standard value.