Abstract
The application of PAR as a chromogenic reagent for the determination of palladium is discussed and several procedures are described. Two basic approaches are possible. The first, is to operate at pH 7.0 employing EDTA and sodium citrate as masking reagents to provide selectivity. The second approach, a modification of a method by Busev and Ivanov, utilizes 6 N sulfuric acid. A green palladium-PAR complex is formed and its absorbance may either be measured in the aqueous solution or after extraction into ethyl acetate. Further increase in sensitivity can be achieved by re-extraction of the green color into a small volume of aqueous stripping solution. Additional sensitivity can be gained by decomposing the green complex and measuring the absorbance of the free PAR, which has a higher absorptivity than its PAR complex. It is possible to determine microgram quantities of palladium in the presence of large amounts of all metallic elements. Difficulties arise only in the presence of niobium, tantalum, silver, gold, and mercury. However, these disturbances can be overcome by an appropriate modification of the general procedure.
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