Abstract

Pollution of water by persistent organic pollutants is well described; however, little is known about the accumulation of these pollutants by aquatic organisms. For this reason, a method based on QuEChERS extraction and gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) was developed for the determination of pesticides, polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) in the muscles of five fish species from the bay of Soumbedioune (Dakar, Senegal). This method shows good recoveries of extraction (68.2-98.1% for pesticides, 83.87-98.10% for PAHs and 81.30-98.15% for PCBs), precision (% RSD ≤ 1%), sensitivity (LODs between 0.001 and 0.079 ng g⁻¹), linearity (R² ≥ 0.99) and repeatability and reproducibility, evaluated for three concentration levels (10 ng g⁻¹, 200 ng g⁻¹ and 500 ng g⁻¹), ≤ 15% for the majority of pollutants under study except for alachlor, atrazine, acetochlor, dicofol, deltamethrin and dichlorvos where a RSD ≥ 20% was determined for the 10 ng g⁻¹ concentration. Organic pollutants have been detected in fish from the Soumbedioune coast demonstrating the necessity of a regular survey of water and fish in order to protect the populations.

摘要

持久性有机污染物对水的污染得到了很好的描述；然而，人们对水生生物积累这些污染物知之甚少。为此，开发了一种基于 QuEChERS 萃取和气相色谱-串联质谱联用 (GC-MS/MS) 的方法，用于测定五人肌肉中的农药、多氯联苯 (PCBs) 和多环芳烃 (PAHs)。 Soumbedioune 湾（达喀尔，塞内加尔）的鱼类。该方法显示出良好的萃取回收率（农药为 68.2-98.1%，PAHs 为 83.87-98.10%，PCBs 为 81.30-98.15%）、精密度（% RSD ≤ 1%）、灵敏度（LODs 介于 0.001 和 0.079 ng g ^-1之间） ), 线性度 (R ²≥ 0.99）和重复性和再现性，评估三个浓度水平（10 ng g ^-1、200 ng g ^-1和 500 ng g ^-1），对于除甲草胺、阿特拉津、乙草胺外的大多数研究污染物≤15% 、三氯杀螨醇、溴氰菊酯和敌敌畏，其中 10 ng g ^-1浓度的 RSD ≥ 20% 。在 Soombedioune 海岸的鱼类中检测到有机污染物，表明有必要对水和鱼类进行定期调查，以保护种群。