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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
摘要

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%.

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产品描述

Sigma-Aldrich
Triton X-100, laboratory grade
Sigma-Aldrich
水, Nuclease-Free Water, for Molecular Biology
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Triton X-100, for molecular biology
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水, suitable for HPLC
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水, sterile-filtered, BioReagent, suitable for cell culture
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水, HPLC Plus
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Triton X-100, BioXtra
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水, suitable for ion chromatography
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水, deionized
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Triton X-100 溶液, BioUltra, for molecular biology, ~10% in H2O
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硝酸钠, ReagentPlus®, ≥99.0%
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水, for molecular biology, sterile filtered
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水, for embryo transfer, sterile-filtered, BioXtra, suitable for mouse embryo cell culture
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硝酸钠, ACS reagent, ≥99.0%
纯水密度标准物质RM, 0.9982 g/mL(20 °C), UKAS ISO/IEC17025 and ISO Guide 34 certified, density: 0.9982 g/mL at 20 °C, density: 0.9970 g/mL at 25 °C
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水, for TOC analysis
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双硫腙, ACS reagent, for spectrophotometric det. of Cd, Cu, Hg, Pb, Zn, ≥98.0% (TLC)
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水, ACS reagent, for ultratrace analysis
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水, BioPerformance Certified
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水, PCR Reagent
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E-Toxate 水, endotoxin, free
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水, for cell biology, sterile ultrafiltered
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硝酸钠, ≥99.0%, suitable for plant cell culture
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镉, powder, −100 mesh, 99.5% trace metals basis
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密度标准品 998kg/m3, H&D Fitzgerald Ltd. Quality
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双硫腙, Practical Grade
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低氘水, ≤1 ppm (Deuterium oxide)
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水, ACS reagent
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镍, foil, thickness 0.125 mm, ≥99.9%
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Triton X-45