Merck
  • Início
  • Resultados da busca
  • Method validation and proficiency testing for determination of total arsenic in apple juice by inductively coupled plasma/ mass spectrometry.

Method validation and proficiency testing for determination of total arsenic in apple juice by inductively coupled plasma/ mass spectrometry.

Journal of AOAC International (2014-08-26)
Yang Chen, Ravinder M Reddy, Michael A McLaughlin, Fadwa Al-Taher, Ramesh R Yettella, Steffen Uhlig, Christian Bläul
RESUMO

A proficiency test (PT) program for determination of total As in apple juice samples was conducted by the Food Emergency Response Network (FERN) laboratories. An analytical method using inductively coupled plasma (ICP)-MS was validated for this project. The LOD and LOQ were determined to be 0.315 and 2.32 ng/g, respectively. A total of eight apple juice samples were sent to 38 FERN laboratories, and results were statistically evaluated according to ISO 13528:2005. The total As concentrations in the PT samples reported by the participating laboratories were very close to those obtained in the homogeneity and stability tests. The reproducibility, repeatability, interlaboratory, and intralaboratory variability results led to 69% of participating laboratories being rated as satisfactory using the widely accepted Izl score <or= 2 criterion. The percentage of laboratories with acceptable z scores (Izl scores <or=2) increased from 61 to 89% with the increase in As concentration in PT samples from 5.05 to 30.72 ng/g. This study demonstrated that the ICP/MS method was adequate for total As determination in fruit juice, and most of the participating laboratories were proficient in their analytical performance.

MATERIAIS
Número do produto
Marca
Descrição do produto

Sigma-Aldrich
Nitric acid, ACS reagent, ≥90.0%
Supelco
Rhodium ICP-MS Standard, ready-to-use, 10 mg/kg Rh in nitric acid
Sigma-Aldrich
Arsenic, 99.999% trace metals basis
Sigma-Aldrich
Arsenic, powder, ≥99.997% trace metals basis
Sigma-Aldrich
Nitric acid, 70%, purified by redistillation, ≥99.999% trace metals basis
Sigma-Aldrich
Germanium, powder, −100 mesh, ≥99.999% trace metals basis
Sigma-Aldrich
Germanium, powder, −100 mesh, ≥99.99% trace metals basis
Sigma-Aldrich
Rhodium(III) nitrate solution, ~10 % (w/w) (Rh in >5 wt. % HNO3)
Supelco
Nitric acid concentrate, 0.1 M HNO3 in water (0.1N), eluent concentrate for IC
Germanium, sheet, 10x10mm, thickness 0.5mm, single crystal, -111, 100%
Germanium, sheet, 10x10mm, thickness 0.6mm, single crystal, -111, 100%
Germanium, microfoil, 50x50mm, thinness 0.25μm, specific density 166.3μg/cm2, 6 micron aluminum permanent support, 100%
Germanium, rod, 50mm, diameter 5mm, polycrystalline, n-type, 99.999%
Germanium, sheet, 50x50mm, thickness 0.5mm, single crystal, 99.999%
Germanium, disks, 15mm, thickness 1.0mm, polycrystalline, 100%
Germanium, rod, 6mm, diameter 6.0mm, single crystal, 100%
Germanium, sheet, 4x4mm, thickness 0.05mm, polycrystalline, 99.999%
Germanium, sheet, 50x50mm, thickness 1.0mm, polycrystalline, 99.999%
Germanium, rod, 25mm, diameter 5mm, polycrystalline, n-type, 99.999%
Germanium, sheet, 25x25mm, thickness 3.0mm, polycrystalline, 99.999%
Germanium, sheet, 7x24mm, thickness 1.0mm, polycrystalline, 99.999%
Germanium, microfoil, 25x25mm, thinness 0.5μm, specific density 333μg/cm2, 6 micron aluminum permanent support, 100%
Germanium, sheet, 25x25mm, thickness 1.0mm, polycrystalline, 99.999%
Germanium, rod, 25mm, diameter 2.0mm, polycrystalline, n-type, 99.999%
Germanium, sheet, 25x25mm, thickness 1.0mm, single crystal, 99.999%
Germanium, sheet, 50x50mm, thickness 3.0mm, polycrystalline, 99.999%
Germanium, disks, 20mm, thickness 1.0mm, single crystal, 100%
Germanium, sheet, 10x10mm, thickness 0.25mm, polycrystalline, 99.999%
Germanium, sheet, 6x6mm, thickness 1.0mm, polycrystalline, 99.999%
Germanium, microfoil, 25x25mm, thinness 0.25μm, specific density 166.3μg/cm2, 6 micron aluminum permanent support, 100%