According to the replacement of low boiling acid by high boiling acid, F - and Cl - are distilled together with sulfuric acid as distillation agent at a certain temperature for separation and enrichment. Using CIC-D120 ion chromatograph , SH-AC-3 anion columns. 3.6 mM Na2CO3+4.5 mM NaHCO3 eluent and bipolar pulse conductance method,under the recommended chromatographic conditions, the chromatogram is as follows.
The detection limits of F- and Cl- are 0.84ug/L and 0.37 ug/L. The recoveries of F- and Cl- are 91%-107% and 95%-105%(n=10). The coexisting ions in the plating solution had no interference with the determination of F- and Cl-.
Post time: Apr-18-2023