Agricultural and Biosystems Engineering Publications

Campus Units

Agricultural and Biosystems Engineering, Civil, Construction and Environmental Engineering, Food Science and Human Nutrition, Toxicology

Document Type

Article

Publication Version

Published Version

Publication Date

2012

Journal or Book Title

Eurasian Chemico-Technological Journal

Volume

14

Issue

4

First Page

331

Last Page

335

Research Focus Area(s)

Land and Water Resources Engineering

Abstract

Present paper describes optimization of the method of quantitative determination of total petroleum hydrocarbons in soil samples using headspace solid - phase microextraction (SPME) in combination with gas chromatography - mass spectrometry (GC-MS). Effects of moisture content and solvent additives were studied. It was established that an increase of the moisture content in soil leads to an increase of the response of petroleum hydrocarbons reaching its maximum at 15-20% depending on the soil type and concentration of total petroleum hydrocarbons followed by its gradual decrease. For the same concentration of petroleum hydrocarbons, an increase of moisture content in soil from 0 to 20% may lead to a 15x increase of total petroleum hydrocarbons response by solid - phase microextraction. Determination of total petroleum hydrocarbons in soils by SPME -GC-MS without moisture control of samples may lead to large errors, especially at low concentrations. It was established that addition of the solvent to a soil-water mixture allows dissolution of an oil film on the water surface and provides better extraction of hydrocarbons from soil to water phase. To avoid effect of moisture content on the extraction efficiency and more precise analysis of the real samples, addition of the excess distilled water must be done. Addition of the polar organic solvent to a soil-water mixture (10% isopropanol) allows dissolution of an oil film on the water surface and provides linear dependence of extraction efficiency vs total petroleum hydrocarbons content in soil. Testing of the optimized method on model soil samples provided quantitative data, results being in 30-120% range from the real values.

Comments

This article is published as Alimzhanova, M. B., B. N. Kenessov, M. K. Nauryzbayev, and J. A. Koziel. "Effects of moisture content and solvent additive on headspace solid-phase microextraction of total petroleum hydrocarbons from soil." Eurasian Chemico-Technological Journal 14, no. 4 (2012): 331-335. Posted with permission.

Copyright Owner

al-Farabi Kazakh National University

Language

en

File Format

application/pdf

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