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In the study, a method developed for the determination of lipophilic shellfish toxins in muscular tissues of Ruditapes philippinarum was presented. Lipophilic shellfish toxins contain Dinophysistoxin-1 (DTX1), dinophysistoxin-2 (DTX2) and homo-yessotoxins (h-YTX). We used microwave-assisted extraction (MAE) method with methanol as extractant to perform the sample preparation for muscular tissues of Ruditapes philippinarum and analyzed the crude extracts by ultra-performance liquid chromatography quadrupole linear ion trap mass spectrometry (UPLC-MS/MS). The microwave-assisted extraction operational parameters, including extraction temperature and volume, the solvent type and time, were selected detailed about extraction efficiency of lipophilic shellfish toxins from Ruditapes philippinarum muscular tissues. The method recoveries at three different spiked levels proved to be in the range from 50.47% to 94.98%. (Ruditapes philippinarum.

A long-term investigation, which covered 6 sampling campaigns over one year, was carried out to evaluate the occurrence, removal and risk of nonylphenol (NP), bisphenol A (BPA) and triclosan (TCS) in two full-scale sewage treatment plants (STPs) in Guangdong, South China. The target compounds were detected in every sample. The influent concentrations of NP were in the ppb level, while TCS in the ppt level. The seasonal variation in the influent was observed due to human consumption and the rainfall. Domestic sewage discharge was an important source of TCS to the STPs. Three kinds of endocrine disrupting compounds (EDCs) could not be completely removed in the STPs, and the activated sludge treatment process contributed to most of the removal of compounds. In addition, the oxic tank and the anaerobic tank both showed good removal performances for target EDCs. According to the results produced from the calculation of the risk quotient, in the STP1 effluents TCS could pose a high risk to the aquatic environment, and STP2 effluents existed high risk of estrogen activity.