Determination of Nickel and Palladium in Environmental Samples by Low Temperature ETV-ICP-OES Coupled with Liquid-liquid Extraction with Dimethylglyoxime as Both Extractant and Chemical Modifier*

A novel method for the determination of nickel and palladium in environmental samples by low temperature ETV-ICP-OES with dimethylglyoxime (DMG) as both the extractant and chemical modifier has been developed. In this study, it was found that nickel and palladium can form complexes with dimethylglyoxime(0.05%, mass fraction) at pH 6. 0 and can be extracted into chloroform quantitatively. The complexes can be evaporated into plasma at a suitable temperature(1400°C) for ICP-OES detection. Under the optimized conditions, the detection limits of nickel and palladium are 0. 48 and 0. 40 ng/mL, respectively, while the RSD values are separately 5. 0% and 3. 1% (ρ = 50 ng/mL, n = 7). The proposed method was applied to the determination of the target analytes in environmental samples with satisfactory results.