偶氮氯膦Ⅰ直接光度法的要点是采用硫脲-无水亚硫酸钠作铜的掩蔽剂,以六次甲基四胺为缓冲溶液,在pH5左右,显色剂与铝形成稳定紫红色络合物,于波长610nm处测得摩尔吸光系数为1.82×10~4。本法适用于铅黄铜、铝青铜、铝铁镍、康铜等多种铜基合金中铝含量(0.01—10%)的测定。 The key point of chlorophosphonazo I direct spectrophotometry is the use of thiourea - anhydrous sodium sulfite as copper masking agent, hexamethylenetetramine as buffer solution, at pH5, the color reagent and aluminum form a stable purple complex The molar absorption coefficient measured at a wavelength of 610 nm was 1.82 × 10 -4. This method is applicable to the determination of aluminum content (0.01-10%) in a variety of copper-based alloys such as lead brass, aluminum bronze, aluminum iron nickel,