Journal of Analytical & Bioanalytical Techniques
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Esters of o-phthalic acid are the high toxic compounds. The plasticized polymers are the main source of the emergence
of esters of o-phthalic acid in the environment. Gas chromatography-mass spectrometry method coupled with liquid-
liquid microextraction pre-concentration was used for high sensitive determination of o-phthalates in water. The optimal
extractant volume (10 μL) was calculated from dependence of the impurities recovery on partition coefficient of impurities
between the extractant (n-octane) and water. It was shown that the ultrasound assisted microextraction is an efficient method
for pre-concentration of o-phthalates. Application of extract capillary collection solved the problem of the ?light? extractant
sampling. The following sources of systematic errors of the determination of o-phthalates have been found: Leaching of
dialkyl-o-phthalates from chromatographic septum; o-phthalates impurities in solvents; the hydrolytic lability of esters of
o-phthalic acid. It was shown that the uncontrolled impact of these factors could lead to changes in the actual concentration
of impurities determined at 1-2 orders of magnitude. The methods of accounting and elimination of systematic errors are
proposed. Rayleigh distillation method was recommended for solvents purification. The storage time of water samples should
not exceed three days. The lowering of o-phthalates leaching was achieved using Merlin septa. The expanded uncertainty was
calculated. It included precision, uncertainty of standards preparation, calibration, sample introduction, enrichment factor.
The relative expanded uncertainty was at the level of 12.8-29.6%. The limits of detection and quantification of o-phthalates
achieved were at the level of 10
and were highly competitive with the best world results.
V A Krylov, Doctor of Chemistry is Professor, Head of the Division of Analytical Chemistry of the Nizhny Novgorod State University, Head of the Laboratory of
Analytical Chemistry of High Purity Substances at the Institute of the Chemistry of High Purity Substances of the Russian Academy of Sciences. His main research
interest lies in the development of the theory and applications of chromatography, chromatography-mass spectrometry for the analysis of high purity substances,
including monoisotopic compounds, environmental objects and for the development of methods of the micro pre-concentration of impurities. The attained detection
limits for molecular impurities constituted 10
wt% and hit a record low. He is the author of more than 200 scientific papers, including reviews on the
analytical chemistry of high purity volatile substances, the determination of organic substances in air, and liquid-liquid microextraction pre-concentration.
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