Screening and identification of chlorpyrifos in groundwater situated under agricultural area

Kovacevik, Biljana and Zdravkovski, Zoran and Mitrev, Sasa (2017) Screening and identification of chlorpyrifos in groundwater situated under agricultural area. In: Eastwest Chemistry conference, 12-14 Oct 2017, Skopje, Republic of Macedonia.

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Official URL: http://ewcc2017.org/

Abstract

Chlorpyrifos is widely used organophosphate insecticide, acaricide and miticide used primarily to control foliage and soil-borne insect pests on a variety of food and feed crops. According to US EPA, this pesticide is used in around 800 products for domestic use, industry, and agriculture. The study deals with screening and identification of chlorpyrifos in groundwater situated under agriculture area using liquid-liquid extraction with dichloromethane Followed by GC–MS. For lower detection limits the samples were concentrated for 10 000 times. Due to the multiple steps of sample extraction, an internal standard calibration with thriphenylphosphate was used in method validation. The oven temperature ramped from 60 ºC for 2 min up to 150 ºC with an increment of 25 ºC for 0 min, ramped to 200 ºC with an increment of 3 ºC for 0 min, ramped to 280 ºC with an increment of 20 ºC for 10 min. The type of injection was pulsed splitless using pressure of 50 psi. Method validation showed the relative standard deviation of 6.34, reproducibility of 130%, bias 0.08. The LOD of the instrument was 0,33 µg/L. Groundwater samples were collected from 78 existing boreholes. Chlorpyrifos was found in a concentration of 0.133 µg/L ± 0.00929 in one sample. The research showed that chlorpyrifos has very low leaching capabilities but heavy rainfall may carry it into the groundwater aquifers.

Item Type: Conference or Workshop Item (Poster)
Uncontrolled Keywords: GC-MS, pulsed splitless injection, leaching
Subjects: Natural sciences > Chemical sciences
Agricultural Sciences > Other agricultural sciences
Divisions: Faculty of Agriculture
Depositing User: Biljana Kovacevic
Date Deposited: 18 Dec 2017 14:12
Last Modified: 18 Dec 2017 14:12
URI: http://eprints.ugd.edu.mk/id/eprint/18676

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