CHLORINE DETERMINATION IN PHOTOGRAPHIC DEVELOPER SOLUTIONS USING WAVELENGTH-DISPERSIVE X-RAY-FLUORESCENCE

A wavelength-dispersive x-ray fluorescence method is described for the determination of total chlorine in fresh and seasoned photographic de veloper solutions. The method uses a cadmium internal standard to corr ect for slight changes in the solution matrix and covers a concentrati on range of 15-500 mg l(-1) chlorine. Precision studies using the meth od resulted in a relative standard deviation (RSD) of 0.41% (1s) at th e 200 mg l(-1) chlorine level and a RSD of 1.13% (1s) at the 50 mg l(- 1) level. The limit of detection for chlorine was found to be 5 mg l(- 1) and the limit of quantification was calculated as 15 mg l(-1).