标准摘要
[中文适用范围]： 磷含量可测定在 0.001% (m/m) 至 0.025% (m/m) 范围内。 Cr(III) 和二氧化硅会产生干扰，但已被消除。 原理是将测试部分溶解在硝酸和盐酸的混合物中，用硫酸发烟，将 Cr(III) 氧化为 Cr(VI)，沉淀磷酸铁 (III) 并重新溶解沉淀，添加硼酸、酒石酸和氨基磺酸，钼磷酸的形成和萃取，将杂多酸还原成钼蓝并反萃取到水相中，测量水溶液在700 nm处的吸光度。 [外文原描述]： Phosphorus content can be determined in the range of 0,001 % (m/m) to 0,025 % (m/m). Cr(III) and silica cause interference which is eliminated. The principle is dissolution of a test portion in a mixture of nitric and hydrochloric acids, fuming with sulfuric acid, oxidation of Cr(III) to Cr(VI), precipitation of Fe(III) phosphate and redissolution of the precipitate, addition of boric, tartaric and sulfamic acids, formation and extraction of molybdophosphoric acid, reduction of the heteropoly acid to molybdenum blue and back-extraction into an aqueous phase, measurement of the absorbance of the aqueous solution at 700 nm.
英文名称Nickel alloys — Determination of phosphorus content — Molybdenum blue molecular absorption spectrometric method