The extraction and analytical multiresidue method, has been developed and validated for
quantification of trace levels of 74 pesticide belong to different chemical groups in organic and
conventional Olive farm soil samples (Old, medial and new olive farms which is 25, 15 and 5 years
respectively). Soil samples collected from Al-Jouf 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 method reveals that experimental results
were highly satisfactory in respect of various analytical parameters such as linearity, recovery and
precision especially with the tested soil samples which is are complex matrixes, preparation is a
critical step, and one that is usually expensive, time-consuming, and labor intensive. The limit of
detection (LOD) and limit of quantification (LOQ) for the analyzed pesticides were in the range of
1.01-13.91 µg kg-1 and 3.02 – 29.15 µg kg-1, respectively. Pesticide recoveries form spiked soil
samples with different pesticides ranged from 65.5 to 111.7%. The proposed method featured good
sensitivity, pesticide quantification limits were low enough, and the precision, expressed as relative
standard deviation, ranged from 0.29 to 13.32%. Pesticide residues being detected by applying the
modified QuEChERS and GCMSMSTQD method, the levels were ranged from 43.00 to 2.00 µg kg-1
for 18 different pesticides, 1.99 to 1.00 µg/kg-1 for 16 different pesticides, 0.99 to 0.50 µg/kg-1 for 12
different pesticides and lower than 0.50 µg kg-1 for 28 different pesticide residues. The proposed
QuEChERS and GC-MS/MSTQD method were applied successfully for the residues extraction and
determination the 74 pesticides.
Prof. Mohamed Hamza EL-Saeid
Department of Soil Sciences, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh 11451,Kingdom of Saudi Arabia and Department of USA.
Ahmed Yasseen Majjami
Department of Soil Sciences, College of Food and A Kingdom of Saudi Arabia.
Prof. A. S. Modaihsh
Department of Soil Sciences, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Kingdom of Saudi Arabia.
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