• 主页
  • 查找结果
  • Displacement-dispersive liquid-liquid microextraction based on solidification of floating organic drop of trace amounts of palladium in water and road dust samples prior to graphite furnace atomic absorption spectrometry determination.

Displacement-dispersive liquid-liquid microextraction based on solidification of floating organic drop of trace amounts of palladium in water and road dust samples prior to graphite furnace atomic absorption spectrometry determination.

Journal of AOAC International (2013-09-05)
Maryam Ghanbarian, Daryoush Afzali, Ali Mostafavi, Fariba Fathirad
摘要

A new displacement-dispersive liquid-liquid microextraction method based on the solidification of floating organic drop was developed for separation and preconcentration of Pd(ll) in road dust and aqueous samples. This method involves two steps of dispersive liquid-liquid microextraction based on solidification. In Step 1, Cu ions react with diethyldithiocarbamate (DDTC) to form Cu-DDTC complex, which is extracted by dispersive liquid-liquid microextraction based on a solidification procedure using 1-undecanol (extraction solvent) and ethanol (dispersive solvent). In Step 2, the extracted complex is first dispersed using ethanol in a sample solution containing Pd ions, then a dispersive liquid-liquid microextraction based on a solidification procedure is performed creating an organic drop. In this step, Pd(ll) replaces Cu(ll) from the pre-extracted Cu-DDTC complex and goes into the extraction solvent phase. Finally, the Pd(ll)-containing drop is introduced into a graphite furnace using a microsyringe, and Pd(ll) is determined using atomic absorption spectrometry. Several factors that influence the extraction efficiency of Pd and its subsequent determination, such as extraction and dispersive solvent type and volume, pH of sample solution, centrifugation time, and concentration of DDTC, are optimized.

材料
货号
品牌
产品描述

Sigma-Aldrich
水, Nuclease-Free Water, for Molecular Biology
Sigma-Aldrich
水, suitable for HPLC
Sigma-Aldrich
水, sterile-filtered, BioReagent, suitable for cell culture
Sigma-Aldrich
水, HPLC Plus
Sigma-Aldrich
水, deionized
Supelco
水, suitable for ion chromatography
Sigma-Aldrich
石墨, powder, <20 μm, synthetic
Sigma-Aldrich
水, for molecular biology, sterile filtered
Sigma-Aldrich
水, for embryo transfer, sterile-filtered, BioXtra, suitable for mouse embryo cell culture
Sigma-Aldrich
二乙基二硫代氨基甲酸钠 三水合物, ACS reagent
Supelco
水, for TOC analysis
Sigma-Aldrich
铜, powder, <425 μm, 99.5% trace metals basis
Supelco
水, ACS reagent, for ultratrace analysis
Sigma-Aldrich
水, BioPerformance Certified
Sigma-Aldrich
铜, foil, thickness 0.25 mm, 99.98% trace metals basis
Sigma-Aldrich
铜, powder, 99.999% trace metals basis
Sigma-Aldrich
水, PCR Reagent
Sigma-Aldrich
铜, wire, diam. 1.0 mm, ≥99.9%
Sigma-Aldrich
水, for cell biology, sterile ultrafiltered
Supelco
二乙基二硫代氨基甲酸钠 三水合物, ACS reagent, for the determination and separation of heavy metals, ≥99.0%
Sigma-Aldrich
水, ACS reagent
Sigma-Aldrich
铜, ACS reagent, granular, 10-40 mesh, ≥99.90%
Sigma-Aldrich
二乙基二硫代氨基甲酸钠 三水合物
Sigma-Aldrich
钯, powder, <1 μm, ≥99.9% trace metals basis
Sigma-Aldrich
铜, nanopowder, 60-80 nm particle size (SAXS), ≥99.5% trace metals basis
Sigma-Aldrich
铜, nanopowder, 40-60 nm particle size (SAXS), ≥99.5% trace metals basis
Sigma-Aldrich
铜, powder (spheroidal), 10-25 μm, 98%
Sigma-Aldrich
铜, powder, <75 μm, 99%
Sigma-Aldrich
水, tested according to Ph. Eur.
Sigma-Aldrich
E-Toxate 水, endotoxin, free