Publications by authors named "Pedro Trechera"
Ambient air particulate total lung deposited surface area (LDSA) levels in urban Europe.
Sci Total Environ
November 2023
This study aims to picture the phenomenology of urban ambient total lung deposited surface area (LDSA) (including head/throat (HA), tracheobronchial (TB), and alveolar (ALV) regions) based on multiple path particle dosimetry (MPPD) model during 2017-2019 period collected from urban background (UB, n = 15), traffic (TR, n = 6), suburban background (SUB, n = 4), and regional background (RB, n = 1) monitoring sites in Europe (25) and USA (1). Briefly, the spatial-temporal distribution characteristics of the deposition of LDSA, including diel, weekly, and seasonal patterns, were analyzed. Then, the relationship between LDSA and other air quality metrics at each monitoring site was investigated.
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- The study analyzed hourly particle number size distributions (PNSD) from 26 European sites and 1 in the US to understand urban ultrafine particles and their air quality impacts.
- Findings show that particle number concentrations (PNC) are highest in traffic areas compared to urban background and suburban locations, with noticeable increases as one moves from Northern to Southern Europe.
- Recommendations highlight the need for specific PNSD monitoring to accurately assess the health effects of nanoparticles, with calls for standardized measurement practices to ensure comparability across different sites.
Geochemistry and oxidative potential of the respirable fraction of powdered mined Chinese coals.
Sci Total Environ
December 2021
Article Synopsis
- The study investigates the geochemical properties and oxidative potential (OP) of respirable coal fractions from 22 Chinese coal samples.
- It finds that certain minerals and elements, such as anatase, Cs, and W, increased in concentration within specific coal fractions, while others like Fe and sulphates decreased.
- The research demonstrates significant correlations between OP and various geochemical indicators, highlighting that specific inorganic components in coal and organic matter influence OP, particularly in bituminous coal samples.
We focus on a comparison of the geochemistry and mineralogy patterns found in coal, deposited dust (DD), respirable deposited dust (RDD) and inhalable suspended dust (PM10) from a number of underground mines located in China, with an emphasis on potential occupational health relevance. After obtaining the RDD from DD, a toxicological analysis (oxidative potential, OP) was carried out and compared with their geochemical patterns. The results demonstrate: i) a dependence of RDD/DD on the moisture content for high rank coals that does not exist for low rank coals; ii) RDD enrichment in a number of minerals and/or elements related to the parent coal, the wear on mining machinery, lime gunited walls and acid mine drainage; and iii) the geochemical patterns of RDD obtained from DD can be compared with PM10 with relatively good agreement, demonstrating that the characterization of DD and RDD can be used as a proxy to help evaluate the geochemical patterns of suspended PM10.
View Article and Find Full Text PDFThe use of an antimony film coated on a screen-printed carbon electrode (ex-situ SbSPCE) is proposed for the determination of Pd(II) at ppb levels in natural samples by adsorptive stripping voltammetry using dimethylglyoxime as chelating agent. Ex-situ SbSPCE produces a better analytical performance as compared to a commercially sputtered bismuth screen-printed electrode (BiSPE). The detection and quantification limits were 2.
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