Priya B Krishna, Subrahmanayam P, Suvardhan K, Kumar K Suresh, Rekha D, Rao A Venkata, Rao G C, Chiranjeevi P
Environmental Monitoring Laboratory, Department of Chemistry, SV University, Tirupati 517502, AP, India.
J Hazard Mater. 2007 Jun 1;144(1-2):152-8. doi: 10.1016/j.jhazmat.2006.10.002. Epub 2006 Oct 10.
The present paper outlines novel, simple and sensitive method for the determination of palladium by flame atomic absorption spectrometry (FAAS) after separation and preconcentration by cloud point extraction (CPE). The cloud point methodology was successfully applied for palladium determination by using new reagent 4-(2-naphthalenyl)thiozol-2yl azo chromotropic acid (NTACA) and hydrophobic ligand Triton X-114 as chelating agent and nonionic surfactant respectively in the water samples and alloys. The following parameters such as pH, concentration of the reagent and Triton X-114, equilibrating temperature and centrifuging time were evaluated and optimized to enhance the sensitivity and extraction efficiency of the proposed method. The preconcentration factor was found to be (50-fold) for 250 ml of water sample. Under optimum condition the detection limit was found as 0.067 ngml(-1) for palladium in various environmental matrices. The present method was applied for the determination of palladium in various water samples, alloys and the result shows good agreement with reported method and the recoveries are in the range of 96.7-99.4%.
本文概述了一种新颖、简单且灵敏的方法，用于通过浊点萃取（CPE）进行分离和预富集后，采用火焰原子吸收光谱法（FAAS）测定钯。通过使用新型试剂4-(2-萘基)噻唑-2-基偶氮变色酸（NTACA）和疏水性配体Triton X-114分别作为螯合剂和非离子表面活性剂，浊点方法成功应用于水样和合金中钯的测定。评估并优化了诸如pH值、试剂和Triton X-114的浓度、平衡温度和离心时间等参数，以提高所提方法的灵敏度和萃取效率。对于250毫升水样，预富集因子为50倍。在最佳条件下，各种环境基质中钯的检测限为0.067 ngml(-1)。本方法应用于各种水样和合金中钯的测定，结果与报道方法吻合良好，回收率在96.7-99.4%范围内。
