碱性染料萃取光度法,目前仍是国内测定微量金的主要手段,最有实用价值的是孔雀绿、乙基紫、甲基紫和结晶紫,其摩尔吸光系数ε在(5～12)×10~4之间,但金的萃取—浮选光度法还未见有报导。我们发现Au(Ⅲ)—SCN~-—耐尔蓝(Nile Blue简称NB,C.I.№913)三元离子缔合物可被苯、甲苯和二甲苯定量浮选,而且组成固定,ε达(1.5～4.2)×10~5,但以二甲苯体 Basic dye extraction spectrophotometry is still the main method for the determination of trace gold in China. The most practical values ​​are malachite green, ethyl violet, methyl violet and crystal violet. The molar extinction coefficient ε is between (5 ~ 12) × 10 ~ 4, but the gold extraction - flotation spectrophotometry has not been reported. We found that Au (Ⅲ) -SCN ~ - Nile Blue (NB, CI 913) ternary ion association can be quantified by benzene, toluene and xylene flotation, and the composition of a fixed, ε up to ~ 4.2) × 10 ~ 5, but to xylene body