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钢铁中磷的测定,采用磷钼钒酸(钒黄)比色法测定最为简便,颜色稳定。缺点是灵敏度低。氯化亚锡为还原剂的钼蓝法灵敏度高,但该法稳定性较差。近年来采用疏脲-硫酸铜作为磷铝络合物还原剂,并且应用到钢铁分析中去。该法具有简便易于掌握,稳定性较好的特点。因此,我们对这种还原剂在铸铁中磷的分析方面作了试验相改进,拟定了适合硅、锰、磷联合测定的磷钼蓝比色法。经过一年来的投产使用,效果良好。
Determination of phosphorus in steel, using phosphomolybdovanadic acid (vanadium yellow) colorimetric determination of the most simple and stable color. The disadvantage is the low sensitivity. Stannous chloride as reducing agent molybdenum blue sensitivity, but the stability of the method is poor. In recent years, the use of sparse urea - copper sulfate as phosphorus aluminum complex reductant, and applied to the analysis of steel go. The method has the characteristics of simple and easy to grasp, good stability. Therefore, we have made some improvements on the analysis of phosphorus in the cast iron by using this reductant, and developed the phosphomolybdate blue colorimetric method which is suitable for the determination of silicon, manganese and phosphorus. After a year of production, the effect is good.