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Benzothiazoles are a class of compounds with wide-ranging applications, particularly in industrial chemistry. They are used as accelerators in the vulcanization process in the rubber industry, and have applications in pharmaceuticals, due to their antimicrobial, antifungal, and anticancer properties. This class of compounds can be considered emerging contaminants due to their persistence in the environment, and some of them may pose toxicological risks to aquatic life and potentially to human health. The transport mechanisms and environmental fate of these compounds are poorly investigated, particularly in aquatic compartments such as wastewater, and research has been limited to urban areas. For the first time, eight benzothiazoles were found in Arctic atmospheric aerosol over an entire sampling year, from February 2022 to March 2023. A comparison of the seasonal trends of benzothiazoles with specific markers (i.e., major ions, methanesulfonic acid (MSA), levoglucosan, and arabitol) and the employment of a chemometric approach allowed us to identify three key findings: i) two benzothiazoles (BTH-OH and BTH-NH 2 ) can be linked to a local natural source; ii) soil resuspension is another possible source of two other species (BTH-SH and BTH-MeS); and iii) long-range atmospheric transport sources are associated with BTH and BTH-SO 3 H. The species present in the Arctic aerosol have different abundances compared to urban areas, confirming the necessity to improve research in different environments to better understand their transport mechanisms and environmental fate., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)

A new Continuous Flow Analysis (CFA) system coupled with Fast Liquid Chromatography - tandem Mass Spectrometry (FLC-MS/MS) has been recently developed for determining organic markers in ice cores. In this work we present an upgrade of this innovative technique, optimized for the detection of levoglucosan in ice cores, a crucial tracer for reconstructing past fires. The upgrade involved a specific optimization of the chromatographic and mass spectrometric parameters, allowing for a higher sampling resolution (down to 1 cm) and the simultaneous collection of discrete samples, for off-line analysis of water stable isotopes and additional chemical markers. The robustness and repeatability of the method has been tested by the analysis of multiple sticks of ice cut from the same shallow alpine ice core, and running the system for several hours on different days. The results show similar and comparable trends between the ice sticks. With this upgraded system, a higher sensitivity and a lower limit of detection (LOD) was achieved compared to discrete analysis of alpine samples for levoglucosan measurements. The new LOD was as low as 66 ng L -1 , a net improvement over the previous LOD of 600 ng L -1 ., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)