• Home
  • Search Results
  • Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of Cd and Ni in tea and water samples.

Ultrasound-assisted surfactant-enhanced emulsification microextraction for the determination of Cd and Ni in tea and water samples.

Environmental technology (2014-08-26)
Maryam Ezoddin, Tayebeh Taghizadeh, Behrooz Majidi
ABSTRACT

A microextraction method based on ultrasound-assisted surfactant-enhanced emulsification using solidification of a floating organic droplet (UASEME-SFO) was evaluated for simultaneous determination of Cd and Ni in water and tea samples followed by flame atomic absorption spectrometry. In the UASEME-SFO technique, Triton X-100 was used as an emulsifier to accelerate the emulsification of the extraction solvent into a sample solution and hasten the mass transfer of the analytes. Analytes form a complex and are extracted into 1-dodecanol which was used as an extraction solvent. Some parameters such as type and volume of the extraction solvent, the type and concentration of the surfactant, ultrasound extraction time, reagent concentration, centrifuge conditions and salt concentration were investigated. Under optimum conditions, calibration curves were linear in the range of 0.3-100 and 0.6-180 microg L(-1) with detection limits of 0.11 and 0.20 microg L(-1) for Cd and Ni, respectively. The accuracy of the method was confirmed by parallel analyses using the certified reference material of water and tea samples. The recoveries of the analytes in tea leaves, tea infusions and water samples were in the range of 96.5-105.1%.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Triton X-100, laboratory grade
Sigma-Aldrich
Water, Nuclease-Free Water, for Molecular Biology
Sigma-Aldrich
Water, suitable for HPLC
Sigma-Aldrich
Triton X-100, for molecular biology
Sigma-Aldrich
Water, HPLC Plus
Sigma-Aldrich
Water, sterile-filtered, BioReagent, suitable for cell culture
Sigma-Aldrich
Triton X-100, BioXtra
Sigma-Aldrich
Triton X-100 solution, BioUltra, for molecular biology, ~10% in H2O
Supelco
Water, suitable for ion chromatography
Sigma-Aldrich
Water, deionized
Pure Water Density Standard, UKAS ISO/IEC17025 and ISO Guide 34 certified, density: 0.9982 g/mL at 20 °C, density: 0.9970 g/mL at 25 °C
Sigma-Aldrich
Water, for molecular biology, sterile filtered
Sigma-Aldrich
Water, for embryo transfer, sterile-filtered, BioXtra, suitable for mouse embryo cell culture
Sigma-Aldrich
Sodium nitrate, ACS reagent, ≥99.0%
Supelco
Water, for TOC analysis
Sigma-Aldrich
Raney®-Nickel, W.R. Grace and Co. Raney® 2800, slurry, in H2O, active catalyst
Sigma-Aldrich
Dithizone, ACS reagent, for spectrophotometric det. of Cd, Cu, Hg, Pb, Zn, ≥98.0% (TLC)
Supelco
Water, ACS reagent, for ultratrace analysis
Sigma-Aldrich
Water, BioPerformance Certified
Sigma-Aldrich
Water, PCR Reagent
Sigma-Aldrich
Sodium nitrate, ≥99.0%, suitable for plant cell culture
Sigma-Aldrich
Cadmium, powder, −100 mesh, 99.5% trace metals basis
Sigma-Aldrich
Triton X-45
Sigma-Aldrich
Water, for cell biology, sterile ultrafiltered
Sigma-Aldrich
Nickel, nanopowder, <100 nm avg. part. size, ≥99% trace metals basis
Sigma-Aldrich
Dithizone, Practical Grade
Supelco
Sodium nitrate, analytical standard
Sigma-Aldrich
Water, ACS reagent
Sigma-Aldrich
Triton X-102
Sigma-Aldrich
Dithizone, ACS reagent, ≥85.0%