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Determination of Palladium in Water Samples Using Cloud Point Extraction Coupled with Laser Thermal Lens Spectrometry

대한화학회지 2015년 59권 5호 p.407 ~ 412
 ( Han Quan ) - Xi’an University School of Chemical Engineering

 ( Huo Yanyan ) - Xi’an University School of Chemical Engineering
 ( Yang Na ) - Shaanxi Normal University School of Chemistry and Chemical Engineering
 ( Yang Xiaohui ) - Xi’an University School of Chemical Engineering
 ( Zhai Yunhui ) - Xi’an University School of Chemical Engineering
 ( Zhang Qianyun ) - Shaanxi Normal University School of Chemistry and Chemical Engineering

Abstract


A preconcentration procedure for determination of palladium by laser thermal lens spectrometry (TLS) is proposed. It is based on cloud point extraction of palladium(II) ions as 2-(3,5-dichloro-2-pyridylazo)-5-dimethylaminoaniline (3,5-diCl-PADMA) complexes using octylphenoxypolyethoxyethanol (Triton X-114) as surfactant. The effects of various experimental conditions such as pH, concentration of ligand and surfactant, equilibration temperature and time on cloud point extraction were studied. Under the optimized conditions, the calibration graph was linear in the range of 0.15~6 ng mL?1, and the detection limit was 0.04 ng mL?1 with an enrichment factor of 22. The sensitivity was enhanced by 846 times when compared with the conventional spectrophotometric method. The recovery of palladium was in the range of 96.6%~104.0%. The proposed method was applied to the determination of palladium in water samples.

키워드

Cloud point extraction; Palladium; Triton X-114; 2-(3,5-Dichloro-2-pyridylazo)-5-dimethylaminoaniline; Laser thermal lens spectrometry
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