Studies on the Impact of Forest Combustion on Soil Contamination by PAHs Using QuEChERS and GCMS/MSTQD

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Studies on the Impact of Forest Combustion on Soil Contamination by PAHs Using QuEChERS and GCMS/MSTQD

July 29, 2020 Chemistry 0

The present study was conducted in one of the most dense forest area of Asir region located in the
southwest of Saudi Arabia to study the Impact of Forest Combustion on surface and subsurface soil
contamination by Poly Aromatic Hydrocarbons (PAHs). The major toxic effects of PAHs including
cancers, immunity suppression, loss of fertility, mutagenic and cardiovascular diseases. The
extraction and analytical methods, have been developed and validated for quantification of trace
levels of 17 PAHs namely, Naphthalene, Acenaphthylene, Acenaphthene, Fluorene, Phenanthrene,
Anthracene, Fluoranthene, Pyrene, Retene, Benzo [b+j] fluoranthene, Benzo (a)pyrene, Benzo [k]
fluoranthene, 3-methylchol-anthrene, Dibenz [a,h] acridine, Indeno [1,2,3-cd]pyrene, Dibenz [a,h]
anthracene and Benzo [ghi] perylene. Surface and subsurface soil samples were collected from
Alsaqa and Murir post-fire forests in Asir Province, Saudi Arabia, and extracted by Quick, Easy,
Cheap, Effective, Rugged, and Safe (QuEChERS) and analyzed by Gas Chromatography-Mass
Spectrometry Triple Quadrupole (GC-MS/MSTQD). The experimental results of 17 compounds of
PAHs were highly satisfactory linearity, recovery and precision, especially with the tested soil
samples. Recovery % ranged from 96.48±2.19 to 105.61±3.21%., the limit of detection (LOD) ranged
from 3.71 to 6.77 µg kg-1. Meanwhile the limit of quantification (LOQ) for the analyzed PAHs were in
the range of 10.47 to 16.42 µgkg-1. This method featured good sensitivity, lower quantification limits
and the precision of the analyzed 17 PAHs. The calibration curves were linear over wide
concentration ranges with correlation coefficients (r2) 0.7478 to 0.9822 for 17 PAHs analyzed by GCMS/MSTQD. The concentrations of the investigated PAHs in Alsaqa forest surface (S) and subsurface
(SS) soils ranged from F24.81±4.29 to 57.28±3.56 and 24.10±2.31 to 55.47±4.15 mg kg-1dry weight
respectively. Meanwhile, the PAHs concertation in Murir surface and subsurface soils ranged from
12.48±2.37 to 28.83±3.35 and 12.83±1.37 to 25.59±4.31 mg kg-1 dry weight respectively. Retene
compound was detected in Alsaqa, and Murir forest investigated surface, and subsurface soil sample
ranged from 57.28, 55.47, and 28.83, 25.59 mg/kg-1(ppm) respectively. Meanwhile, Retene was not
detected (ND) in the control surface and subsurface soil sample. The detected PAHs by applying the
modified QuEChERS and GC-MS/MSTQD method were applied successfully for the extraction and
determination of the 17 PAHs in burned forest soil samples

Author (s) Details

Mohamed Hamza El-Saeid
Department of Soil Sciences, Chromatographic Analysis Unit, College of Food and Agriculture Sciences, King Saud University, P.O.Box 2460, Riyadh 11451, Kingdom of Saudi Arabia and Department of Chemistry, Texas Southern University, 3100 Cleburne St, Houston, TX 77004, USA.

Marzoq Hadi Al Fahd

Department of Soil Sciences, Chromatographic Analysis Unit, College of Food and Agriculture Sciences, King Saud University, P.O.Box 2460, Riyadh 11451, Kingdom of Saudi Arabia.

Mohamed S. Al-Sewailem
Department of Soil Sciences, Chromatographic Analysis Unit, College of Food and Agriculture Sciences, King Saud University, P.O.Box 2460, Riyadh 11451, Kingdom of Saudi Arabia.

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