標準號：ISO 9388-1992
中文標準名稱：鎳合金 磷含量測定 鉬藍分子吸收光譜法
英文標準名稱：Nickel alloys; determination of phosphorus content; molybdenum blue molecular absorption spectrometric method
標準類型：H62
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：H62
國際標準分類號：77.120.40
適用范圍：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.