高碳铬铁是铸造中常用的中间合金。磷是高碳铬铁中有害元素之一,铬铁中磷元素含量的高低,直接影响着铸件的质量,因此,对高碳铬铁中磷含量的检测具有重要意义。磷的常用测定方法有:硝酸铋-抗坏血酸比色法、氟化钠-氯化亚锡比色法、磷钼酸铵沉淀-酸 High-carbon ferrochromium is a commonly used intermediate alloy in foundry. Phosphorus is one of the harmful elements in high-carbon ferrochromium. The content of phosphorus in ferrochrome directly affects the quality of castings. Therefore, it is of great significance to detect the phosphorus content in high-carbon ferrochrome. Phosphorus commonly used determination methods are: bismuth nitrate - ascorbic acid colorimetric method, sodium fluoride - stannous chloride colorimetric method, ammonium phosphomolybdate precipitation - acid