No abstract

Over the last few decades, the occurrence of pharmaceuticals and personal care products (PPCPs) in aquatic environments has generated increasing public concern. In this review, data on the presence of...

No abstract

No abstract

No abstract

The occurrence of emerging contaminants (ECs) in the aquatic systems under influence of urban areas have been considered as an environmental marker of anthropogenic contamination. In this study 10 ECs were investigated in sediment samples from Santos Bay using a quick, easy, cheap, effective, rugged, and safe method with determination by liquid chromatography tandem mass spectrometry. The method showed acceptable accuracy (51-116%) and precision (relative standard deviation (RSD) ≤ 9), limits of quantification in ng g-1 levels and matrix effect lower than 29%. Environmental occurrence of benzophenone-3, caffeine, ketoconazole and triclocarban was detected in two campaigns (2015 and 2019), with concentrations ranging from < 1 to 470 ng g-1. Caffeine and triclocarban were the most abundant target chemicals occurring in up to 71 and 100% of the sample point, respectively. The results indicated that ECs in sediment samples came from diffused sources as the discharge of treated and untreated sewage in the estuary.

The analysis of the 2,4-D in natural waters is a relevant issue due to real possibility of water contamination by this herbicide. The literature amply covers the subject and liquid chromatography is undoubtedly the the preferred technique for detection and quantification, since it does not require derivatization step. This article shows that besides being a simple, sensitive and reliable method, solidphase extraction (SPE), followed by high performance liquid chromatography and diode array detection, has adequate robustness to a routine method of water quality. The Youden test demonstrated robustness of the experimental procedure for different analysts, column temperature and organic solvents, but sensitive for volume flow and pH of the mobile phase. The method was adequate in the investigation of 2,4-D in surface water samples from Rio da Prata (São Luís, MA) and was not detected in the samples analyzed.