以 CyDTA 为络合剂,二甲酚橙为指示剂在室温条件下测定钢中铝。此法较为简单,准确度、再现性都较高。称取试样1克于250毫升锥形瓶中,加1:9硫酸20毫升,加热溶解,滴加硝酸至无反应,煮沸驱尽氮氧化物。加水60毫升,硼酸2克后,缓慢加入20%氢氧化钠溶液40毫升(并不断摇动),煮沸后取下,冷却至室温,将沉淀连同溶液移入250毫升容量瓶中,以水稀 With CyDTA as complexing agent and xylenol orange as indicator, the aluminum in steel was measured at room temperature. This method is relatively simple, accuracy, reproducibility is high. Weigh the sample 1 g in 250 ml Erlenmeyer flask, add 1: 9 20 ml of sulfuric acid, dissolved by heating, dropping nitric acid to no reaction, boil-out of nitrogen oxides. Add water 60 ml, 2 g boric acid, slowly add 20 ml of sodium hydroxide solution 40 ml (and constantly shaking), remove after boiling, cool to room temperature, the precipitate together with the solution into a 250 ml volumetric flask, diluted with water