Continuous Determination of Palladium and Rhodium in Water by Resin Spectrophotometry

A method for continuous determination of palladium and rhodium by resin spectrophotometry with developer 5 Br PADAP is reported in this paper. It has higher sensitivity and good selectivity. The molar absorbancy indexes of palladium and rhodium are 3.307 0×10 5 L/(mol·cm) and 5.572 3×10 5 L/(mol·cm) respctively. Lambert Beer law is obeyed when palladium and rhodium are between 0.0～16.0 μg/25 mL and 0.0～10.0 μg/25 mL. Detection limits of palladium and rhodium are 1.61×10 -2 μg/25 mL and 9.23×10 -3 μg/25 mL respectively. Coexistent ions do not interfere with the determination of palladium and rhodium. The results of determining palladium and rhodium in water are satisfied.