TY - JOUR
T1 - Screening of quinalphos, trifluralin and dichlorvos residues in fresh water of aquaculture systems in Mekong Delta, Vietnam
AU - Nguyen, Quoc Thinh
AU - Douny, Caroline
AU - Tran, Minh Phu
AU - Brose, Francois
AU - Nguyen, Phuong Thanh
AU - Huong, Do Thi Thanh
AU - Kestemont, Patrick
AU - Scippo, Marie Louise
N1 - Funding Information:
The authors thank CUD (Commission Universitaire pour le Développement) for its financial support (DELTAQUASAFE project). The authors also acknowledge all the staffs of Laboratory of Food Analysis, FARAH ‐ Veterinary Public Health of the University of Liège as well as the staffs of the Department of Fish Nutrition and Aquatic Food Processing, CAF, Can Tho University for labours, knowledge and facilities supporting.
Publisher Copyright:
© 2018 John Wiley & Sons Ltd
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - To develop an easy and reliable method for detecting pesticides and their residues in the Mekong Delta, a GC-MS analytical method was developed and validated according to European guidelines (SANTE/11945/2015) for the determination of residues of three pesticides (quinalphos, trifluralin and dichlorvos) in water. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.002 and 0.007 μg/L, respectively, for quinalphos and trifluralin, and 0.016 and 0.053 μg/L, respectively, for dichlorvos and quinalphos. The repeatability, the within-laboratory reproducibility as well as the trueness met the European criteria. The recovery rate ranged between 72% (for dichlorvos and quinalphos) and 82% (for trifluralin). The developed method was then applied for the analysis of 33 water samples, collected in April 2013, at the beginning of the rainy season in the Mekong Delta in Vietnam. Thirteen samples were from rice field, 10 were collected from cat fish ponds and from red tilapia cages. Results showed that only 9% of total water samples analysed contained residues of pesticides, but only in water from rice fish systems. From the 13 samples taken in these systems, quinalphos was detected in three samples. The other two pesticides were not detected. A comparison between analytical results obtained from GC-MS and an alternative method, that is GC-ECD indicated that GC-ECD is less sensitive than GC-MS, with LOQ ranging from 0.37 to 1.18 (depending on the pesticide). However, for samples with concentrations above these LOQ, no significant difference was observed between the results obtained from the two analytical methodologies.
AB - To develop an easy and reliable method for detecting pesticides and their residues in the Mekong Delta, a GC-MS analytical method was developed and validated according to European guidelines (SANTE/11945/2015) for the determination of residues of three pesticides (quinalphos, trifluralin and dichlorvos) in water. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.002 and 0.007 μg/L, respectively, for quinalphos and trifluralin, and 0.016 and 0.053 μg/L, respectively, for dichlorvos and quinalphos. The repeatability, the within-laboratory reproducibility as well as the trueness met the European criteria. The recovery rate ranged between 72% (for dichlorvos and quinalphos) and 82% (for trifluralin). The developed method was then applied for the analysis of 33 water samples, collected in April 2013, at the beginning of the rainy season in the Mekong Delta in Vietnam. Thirteen samples were from rice field, 10 were collected from cat fish ponds and from red tilapia cages. Results showed that only 9% of total water samples analysed contained residues of pesticides, but only in water from rice fish systems. From the 13 samples taken in these systems, quinalphos was detected in three samples. The other two pesticides were not detected. A comparison between analytical results obtained from GC-MS and an alternative method, that is GC-ECD indicated that GC-ECD is less sensitive than GC-MS, with LOQ ranging from 0.37 to 1.18 (depending on the pesticide). However, for samples with concentrations above these LOQ, no significant difference was observed between the results obtained from the two analytical methodologies.
KW - aquaculture
KW - Mekong Delta
KW - pesticides
UR - http://www.scopus.com/inward/record.url?scp=85056161876&partnerID=8YFLogxK
U2 - 10.1111/are.13890
DO - 10.1111/are.13890
M3 - Article
AN - SCOPUS:85056161876
SN - 1355-557X
VL - 50
SP - 247
EP - 255
JO - Aquaculture Research
JF - Aquaculture Research
IS - 1
ER -