Abstract
Using emulsion dispersive liquid–liquid microextraction preconcentration and injection of a large volume of an extract (10 μL), the limits of chromatographic–mass spectrometric detection of o-phthalic acid esters in water have been attained at the level 4 × 10–6–1 × 10–5 mg/L. The main source of the systemic error of the determination of impurities was found to be the release of o-phthalates from microparticles of chromatographic septum to the carrier gas. The extractant (n-octane) was purified by Rayleigh distillation. The independence of the concentration coefficient of the studied o-phthalates of concentration in the range (0.4–30) × 10–4 mg/L has been demonstrated. The relative expanded uncertainty of the determination of o-phthalates has been calculated and equals 12–39%.
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Original Russian Text © V.A. Krylov, V.V. Nesterova, 2016, published in Zhurnal Analiticheskoi Khimii, 2016, Vol. 71, No. 8, pp. 809–817.
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Krylov, V.A., Nesterova, V.V. Determination of o-phthalic acid esters in water by chromatography–mass spectrometry with emulsion dispersive liquid–liquid microextraction preconcentration. J Anal Chem 71, 777–785 (2016). https://doi.org/10.1134/S1061934816080098
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DOI: https://doi.org/10.1134/S1061934816080098