scholarly journals A Reliable and Cost-Effective Method for Determination of Endocrine-Disrupting Compounds in Coastal Waters, Suspended Particulate Matter, and Sediments by Ultrafast Liquid Chromatography Coupled to Photodiode Array and Fluorescence Detectors

2021 ◽  
Author(s):  
Gabriel de Souza ◽  
Cristiane Fahning ◽  
Vanessa Hatje ◽  
Gisele da Rocha
Keyword(s):  
Liquid Chromatography ◽  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Coastal Waters ◽  
Endocrine Disrupting Compounds ◽  
Northeastern Brazil ◽  
Sediment Samples ◽  
Suspended Particulate ◽  
Endocrine Disrupting ◽  
Photodiode Array

Analytical methods for determining 14 endocrine-disrupting compounds (EDCs) in coastal waters, suspended particles, and sediment samples were successfully performed by ultrafast liquid chromatography with photodiode array and fluorescence detections (UFLC-PDA-FLD). Solid‑phase extraction (SPE) and ultrasound-assisted extraction (USE) were used for sample preparation. Two chromatographic methods have been developed. An isocratic separation method was used to separate bisphenol A (BPA) and steroids and another gradient elution method to separate phthalates and alkylphenols. The detection by fluorescence was used for alkylphenols, BPA, and steroids and photodiode array (PDA) for phthalates. Limits of detection (LOD) ranged from 0.41 (4-tert-octylphenol (4tOP)) to 63 ng L-1 (dibutylphthalate (DBP)), 0.41 (4tOP) to 63.2 ng g-1 dried weight (dw) coastal waters, and solid samples (suspended particulate matter (SPM) and sediment samples), respectively. Recoveries ranged from 52 (diethylphthalate (DEP)) to 116% (DBP) for water, from 54 (DEP) to 108% (estrone (E1)) for SPM, and from 62 (4-n-nonylphenol (4nNP)) to 117% (4-n-octylphenol (4nOP)) for sediment samples. Finally, with the minimization of reagents and energy, the proposed methods were applied to samples collected from Todos os Santos Bay (BTS), Bahia, Northeastern Brazil.

scholarly journals Assessing glyphosate in water, marine particulate matter, and sediments in the Lagoon of Venice

2021 ◽  
Author(s):  
Matteo Feltracco ◽  
Elena Barbaro ◽  
Elisa Morabito ◽  
Roberta Zangrando ◽  
Rossano Piazza ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Water Environment ◽  
Venice Lagoon ◽  
Lagoon Of Venice ◽  
Agricultural Chemicals ◽  
Sediment Samples ◽  
Lagoon Water ◽  
Pollution Levels ◽  
Suspended Particulate

Abstract Lagoon water, suspended particulate matter, and sediment samples from seven sites at Lagoon of Venice were collected from 2019 to 2021 in order to study the presence of the herbicide glyphosate (N-(phosphonomethyl)glycine), among the most widely used agricultural chemicals worldwide, but its occurrence in lagoon water environment has not been deeply investigated. The sites were selected considering a supposed diversity of inputs and of pollution levels. An analytical method based on ion chromatography coupled with tandem mass spectrometry was optimized and validated for lagoon water, marine particulate matter, and sediment samples. Maximum concentrations of glyphosate were 260 and 7 ng L−1 for lagoon water and suspended particulate matter, respectively, and 15 ng g−1 for sediment, with some spatial and temporal fluctuations. Our results demonstrate that glyphosate content in the Venice Lagoon mainly depends on external forcing from river inlets and agricultural lagoon activities.

scholarly journals Influence of the Suspended Particulate Matter on the Satellite Radiance in the Sunglint Observation Geometry in Coastal Waters

2020 ◽  
Vol 12 (9) ◽  
pp. 1445
Author(s):  
Malik Chami ◽  
Morgane Larnicol ◽  
Audrey Minghelli ◽  
Sebastien Migeon
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Coastal Waters ◽  
Satellite Image ◽  
Ocean Color ◽  
Optical Measurements ◽  
Strong Wind ◽  
Turbid Waters ◽  
Suspended Particulate ◽  
Observation Geometry

The analysis of satellite ocean color data that are acquired over coastal waters is highly relevant to gain understanding of the functioning of these complex ecosystems. In particular, the estimation of the suspended particulate matter (SPM) concentrations is of great interest for monitoring the coastal dynamics. However, a high number of pixels of satellite images could be affected by the surface-reflected solar radiation, so-called the sunglint. These pixels are either removed from the data processing, which results in a loss of information about the ocean optical properties, or they are subject to the application of glint correction techniques that may contribute to increase the uncertainties in the SPM retrieval. The objective of this study is to demonstrate the high potential of exploiting satellite observations acquired in the sunglint viewing geometry for determining the water leaving radiance for SPM dominated coastal waters. For that purpose, the contribution of the water leaving radiance Lw to the satellite signal LTOA is quantified for the sunglint observation geometry using forward radiative transfer modelling. Some input parameters of the model were defined using in-situ bio-optical measurements performed in various coastal waters to make the simulations consistent with real-world observations. The results showed that the sunglint radiance is not sufficiently strong to mask the influence of the oceanic radiance at the satellite level, which oceanic radiance remains significant (e.g., 40% at 560 nm for a SPM concentration value of 9 g m−3). The influence of the sunglint radiance is even weaker for highly turbid waters and/or for strong wind conditions. In addition, the maximum radiance simulated in the sunglint region for highly turbid waters remains lower than the saturation radiances specified for the current ocean color sensors. The retrieval of Lw and SPM should thus be feasible from radiances measured in the sunglint pattern by satellite sensors, thus increasing the number of exploitable pixels within a satellite image. The results obtained here could be used as a basis for the development of inverse ocean color algorithms that would interestingly use the radiance measured in sunglint observation geometry as it has been done for other topics than the field of ocean color research.

scholarly journals High-frequency and tidal period observations of suspended particulate matter in coastal waters by AHI/Himawari-8

2020 ◽  
Vol 28 (19) ◽  
pp. 27387
Author(s):  
Xiaosong Ding ◽  
Xianqiang He ◽  
Yan Bai ◽  
Qiankun Zhu ◽  
Fang Gong ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Coastal Waters ◽  
High Frequency ◽  
Tidal Period ◽  
Suspended Particulate
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