MilliporeSigma
  • Mixed hemi-micelle solid-phase extraction based on modified magnetic nanoparticles for extraction of cadmium and lead from food and water samples.

Mixed hemi-micelle solid-phase extraction based on modified magnetic nanoparticles for extraction of cadmium and lead from food and water samples.

Journal of AOAC International (2015-01-30)
Malihe Davudabadi Farahani, Farzaneh Shemirani
ABSTRACT

A simple and rapid method for the separation and preconcentration of trace amounts of Cd(ll) and Pb(ll) in milk powder and water samples by magnetic SPE has been developed. The application of silica- coated magnetite nanoparticles (SCMNPs), modified with an anionic surfactant as an effective sorbent material for the microextractioh and determination of trace amounts of Cd(ll)and Pb(ll) from food samples was investigated. The synthesized SCMNPs modified with sodium dodecyl sulfate have the ability to adsolubilize the metal ions after complexation with 1-(2-pyridylazo)-2-naphthol. These magnetic nanoparticles which are carrying the target metals can be easily separated from the aqueous solution by applying an external magnetic field, and the complexed metals can be desorbed using a proper eluent. The effect of pH, concentration of complexing agent, eluent, extraction time, capacity, and desorp tion conditions were investigated. Under the optimized conditions, preconcentration of a 50.0 mL sample solution permitted the LODs of 0.147 and 2.02 μg/L; and the RSDs (n = 7) for 0.05 μg/mL of Cd(ll) and 0.2 μg/mL of Pb(ll) were 2.96 and 1.3%, respectively. The maximum sorption capacity was 8.8 and 9.5 mglg for Cd(ll) and Pb(ll), respectively.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Nitric-14N acid solution, ~10 N in H2O, 99.99 atom % 14N
Sigma-Aldrich
Ethanol Fixative 80% v/v, suitable for fixing solution (blood films)
Supelco
Ethanol standards 10% (v/v), 10 % (v/v) in H2O, analytical standard
Supelco
Ethanol solution, certified reference material, 2000 μg/mL in methanol
Supelco
Dehydrated Alcohol, Pharmaceutical Secondary Standard; Certified Reference Material
USP
Dehydrated Alcohol, United States Pharmacopeia (USP) Reference Standard
Sigma-Aldrich
Nitric acid, 70%, purified by redistillation, ≥99.999% trace metals basis
Supelco
Nitric acid concentrate, 0.1 M HNO3 in water (0.1N), eluent concentrate for IC
Sigma-Aldrich
Nitric acid, red, fuming, HNO3 >90 %
Sigma-Aldrich
Nitric acid, puriss. p.a., 65.0-67.0%
Sigma-Aldrich
Nitric acid, puriss. p.a., ≥65% (T)
Sigma-Aldrich
Nitric acid, puriss. p.a., reag. ISO, reag. Ph. Eur., for determinations with dithizone, ≥65%
Sigma-Aldrich
Nitric acid, ACS reagent, 70%
Sigma-Aldrich
Nitric acid, ACS reagent, ≥90.0%
Sigma-Aldrich
Sodium dodecyl sulfate, ≥90% ((Assay))
Sigma-Aldrich
Sodium dodecyl sulfate, 92.5-100.5% based on total alkyl sulfate content basis
Sigma-Aldrich
Sodium dodecyl sulfate, ReagentPlus®, ≥98.5% (GC)
Sigma-Aldrich
Sodium dodecyl sulfate, ACS reagent, ≥99.0%
Sigma-Aldrich
Sodium dodecyl sulfate, BioUltra, for molecular biology, ≥99.0% (GC)
Sigma-Aldrich
Sodium dodecyl sulfate, ≥98.0% (GC)
Sigma-Aldrich
Sodium dodecyl sulfate, BioXtra, ≥99.0% (GC)
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, meets USP testing specifications
Supelco
Sodium dodecyl sulfate, suitable for ion pair chromatography, LiChropur, ≥99.0%
Sigma-Aldrich
Sodium dodecyl sulfate, tested according to NF, mixture of sodium alkyl sulfates consisting mainly of sodium dodecyl sulfate
Sigma-Aldrich
Sodium dodecyl sulfate solution, BioUltra, for molecular biology, 10% in H2O
Sigma-Aldrich
Sodium dodecyl sulfate solution, BioUltra, for molecular biology, 20% in H2O
Sigma-Aldrich
Sodium dodecyl sulfate, BioReagent, suitable for electrophoresis, for molecular biology, ≥98.5% (GC)
Sigma-Aldrich
Ethyl alcohol, Pure, 190 proof, ACS spectrophotometric grade, 95.0%
Sigma-Aldrich
Ethyl alcohol, Pure, 200 proof, anhydrous, ≥99.5%
Sigma-Aldrich
Sodium dodecyl sulfate, ≥99.0% (GC), dust-free pellets