Measurement of Organochlorines Residue (OCs) in water, sediment and soil from Jakarta and West Java

Abstract

Organochlorine compounds (OCs) are widely used as pesticides in the past and several of them have been prohibited. Some of these organochlorine compounds have persistent properties that can last long in the environment so that they have been included in the list of groups of persistent organic pollutants (POPs). The bioconcentration and bioaccumulation properties of organochlorine compounds increase the negative impact on the health of living organism. The purpose of this study was to measure the organochlorine compounds in the environment, including samples from agricultural soil, sediment, and river water. Sampling was collected in November and December 2018. Sample of agricultural soils were taken in Bogor and Cianjur regencies while water and sediment samples were taken from the rivers in the Jakarta and Cianjur regencies. Total of 24 organochlorine compounds were then measured using Gas Chromatography Mass Spectrophotometer (GCMS). Recovery of water samples was 72% to 82%, for the soil was 79% to 103% and for sediment was below 40%. The OCs detected in the water was in the range of 0.010 µg/L – 0.4 µg/L and in the soil was in the range of 0.4 µg/Kg – 18.55 µg/Kg. Measurement of OCs in sediments from the estuary or downstream of the river in Jakarta was done, however the result was uncertain due to the difficulties in the sample preparation of oily sediments, and hence the results were not provided here. Therefore, it was necessary to develop a testing methodology, especially the proper refining process so that good recovery data could be obtained in the future. The small amounts of organochlorine that were detected in the environment indicated that these compounds are still existing up to now. The purpose of this study is to produce the proper methodology to examine the matrix effects from sticky and oily samples.