差示分光光度法测定铁粉置换铜溶液中铁离子含量

以磺基水杨酸为显色剂，Fe3+标准溶液作为参比溶液，通过差示分光光度法在419 nm 处测定铁粉置换铜溶液中铁离子总量；研究不同波长、显色剂用量、氨水用量、显色时间对溶液吸光度的影响.在1 h 内最佳测量条件为：吸收波长为419 nm ，20%磺基水杨酸用量为15 mL ，（1+1）氨水用量为15 mL.得到线性回归方程为：C=0.0094Abs+0.01595，相关性系数R2=0.9994.加标回收率为99.38%~99.61%，平均回收率达到99.50%.

Determination of iron ions in iron powder replacement copper solution by differential spectrophotometry

The total amount of iron in iron replacement copper solution was measured at 419 nm by differential spectrophotometry with the chromogenic agent as sulfosalicylic acid and Fe3+ standard solution as reference solution. The effects of the different wavelength, chromogenic agent, the dosage of ammonia, the chromogenic time influence on the absorbance of the solution were investigated. The result shows that the best measurement conditions within 1h as follow: the absorption wavelength is 419 nm, the amount of 20 %sulfosalicylic acid is 15 mL, the amount of (1+1) ammonia is 15 mL. A linear regression equation of "C=0.009 4Abs + 0.0159 5" is obtained, with correlation coefficient R2=0.999 4.The recovery of standard addition is 99.38%~99.38%, and the average recovery is 99.50%.