Reanalysis of Silver Chelate Solution and Determination of Trace Amounts of Silver in Waste Water

Abstract

β-correction spectrophotometry is a new analytical method that

is different from the known dual wavelength techniques. β corrected

absorbance can eliminate completely the interference of excess

colorant to get real absorbance of a complex produced. With the

help of such a principle the complex ratio may still be determined

and the result can be more accurate than with other methods. In

this paper the reaction of silver (I)-ethyl violet in acidic solution

was developed and studied to determine trace amount of Ag(I) in

waste water by β correction spectrophotometry. The compound of

EDTA-2Na is effective for masking other metal ions. Experimental

results have shown that the complex ratio of Ag(I) with EV is 1/2.

Beer's law was obeyed over the concentration range from 0 to

40.0 μg of Ag(I) per 25 mL of final solution. The detection limit

is 0.03 μg/mL.