Analysis of organochlorine pesticide residues in the mineral water resources of the Çaybaşi region, Bursa

Pesticides known as agricultural pesticides used in agricultural lands to increase production in agricultural areas are an important contaminant for water resources. Organochlorine pesticides are the first important synthetic organic pesticides belonging to the persistent organic pollutants class. It is very persistent in the environment and can lead to high toxicity, bioaccumulation and chronic diseases. Due to their environmental and human health effects, restrictions and prohibitions have been imposed by WHO and EPA on organochlorine pesticide types. Although restrictions and prohibitions are imposed on these pesticides, which have high persistence on the soil, in our country, organochlorine pesticide residues are found in the waters due to their illegal use. In this study, organochlorine pesticide residues in mineral waters in the Çaybaşı Region, where mineral water production is intense, in Osmangazi district of Bursa province were investigated. The study was conducted between December-2019-November 2020, by taking monthly samples from 4 different mineral water source points and the last product produced from those waters. Pesticide analyzes were performed on the GC-MS device using solid phase extraction (SPE). In the samples taken, 19 different organochlorine pesticides (alpha-BHC, hexachlorobenzene, beta-BHC, gamma-HCH (lindan), delta-HCH, heptachlor, aldrin, heptachlor epoxide b, o,p' DDE, endosulfan I, p,p' DDE , dieldrin, o,p' DDD, endrin, endosulfan II, o,p' DDT, endosulfan sulfate, p,p' DDT, methoxychlor) were investigated. Within the scope of the study, a new method was created in GC-MS for organochlorine pesticide analysis of mineral waters popularly known as mineral water. The enrichment process has been carried out so that we can see the pesticide limit values specified in the Regulation on Water for Human Use and the Regulation on Natural Mineral Waters. In the enrichment process, C18 SPE cartridges that do not require much solvent, save time, have low analyte losses and provide good recovery in aqueous samples were used. For the validity of the method created, the parameters of accuracy, precision, limit of detection (LOD) and limit of detection (LOQ) were determined. For the validity of the created method, the accuracy, precision, LOD and LOQ parameters were determined. The detection limit of the device was found between 0.80-1.49 μg/L and the detection limit between 2.66-4.97 μg/L. Relative standard deviation values for repeatability range between 0,76-7,19.In the recycling study, recovery was determined between 33-115%. As a result of the study, no organochlorine pesticide residue was found in the analysis results of the mineral water samples taken from 4 different source points and the final product. As a result of the study, no organochlorine pesticide residue was found in the analysis results of the mineral water samples taken from 4 different source points and the final product.