论文部分内容阅读
铜合金中磷的直接比色测定,经典的钼钒黄法比较稳定,但灵敏度较低,显色时间较长;铋盐-抗坏血酸钼蓝法的灵敏度较高,但As~(5+)有严重干扰。曾有文献介绍铋盐-抗坏血酸法测磷时,用硫代硫酸钠可消除As~(5+)的干扰,但实验表明不适用于铜合金,因为在大量铜离子催化下,硫代硫酸钠将钼酸根中铝还原使呈蓝色,干扰更为严重。本文提出用硫脲掩蔽铜离
The direct colorimetric determination of phosphorus in copper alloy shows that the classical molybdenum-vanadium yellow method is relatively stable, but has lower sensitivity and longer color developing time. The sensitivity of bismuth salt-molybdenum blue ascorbate is higher, but As ~ (5+) Serious interference. It has been reported in the literature bismuth salt - ascorbic acid method for the determination of phosphorus, the use of sodium thiosulfate to eliminate interference As ~ (5 +), but the experiment shows that not suitable for copper alloys, because a large number of copper ions catalyzed sodium thiosulfate Aluminum molybdate reduced to blue, more serious interference. This paper proposes the use of thiourea masked copper