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Journal of Environmental Analytical Chemistry

ISSN: 2380-2391

Open Access

Volume 8, Issue 1 (2021)

Research Pages: 1 - 7

Polychlorinated Biphenyls in Groundwater of Grombalia: Optimization and Validation of Analytical Procedures Using Gas Chromatography with Electron Capture Detector

Amani Atayat, Mohamed S Behalo* and Nadia Mzoughi

Now-a-days, the management of water resources is one of the main global challenges, both at the level of agricultural and industrial activities as
well as direct consumption and poses various problems of both qualitative and quantitative order. In the entire world, groundwater suffers from
various sources of contamination principally due to overusing of chemical fertilizer in the agricultural sector. The contamination of groundwater
by organochlorines and more precisely by polychlorinated biphenyls (PCBs) is a problem of global order. As we know that Tunisia is based
on agriculture work like citrus, olive, wheat and cereal, the study of water pollution is a topical subject that remains unclear. Polychlorinated
Biphenyls (PCBs) are one class of persistent organic pollutants. PCBs in recent decades have attracted the attention of scientific and policy maker
communities due to their persistence, their high capacity to bioaccumulation in the food chain and their toxic properties. This work is aimed to
develop an efficient method for the analysis of targeted PCBs in groundwater sample taken from the region of Grombalia. Optimization of PCBs
extraction was performed with applied the experimental design of Dohlert with two factors, solvent and number of extractions. Analysis of PCBs
was performed with gas chromatography coupled with electron capture detector (GC-ECD) with an optimization of temperature program. Results
shows that the optimal temperature program was obtained with a starting temperature of 160°C up to 280°C during 10 min with a rate of 4°C
min-1 and the optimal condition of extraction was obtained with a mixture of hexane/ether (75/25%) and a three time extractions. The optimized
method has been applied to the analysis of the PCBs in nine groundwater samples collected from the Grombalia city. Results indicate that PCBs
concentrations varied between 5.2 μgL-1 and 169 μgL-1. However, the maximum acceptable concentration (MAC) in drinking and surface water
recommended by EPA is 0.5 μgL-1 with a detection limit (LD) ranged between 0.05 to 1.9 μg L-1.

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