12 documents found, page 1 of 2
BTEX in Ambient Air of India: a Scoping Review of their Concentrations, Sources...
Tamrakar, A; Pervez, S; Verma, M; Majumdar, D; Pervez, YF; Candeias, C; Dugga, P; Mishra, A; Verma, SR; Deb, MK; Shrivas, K; Satnami, ML; Karbhal, IToxic gaseous organic air pollutants such as benzene, toluene, ethylbenzene, and xylene isomers (m, p, and o-x) (BTEX) are considered hazardous due to its adverse impacts on human health and on climate change. This review identifies the major research questions addressed so far and the research gap in research articles, published between 2001 and 2022, focusing on the ambient BTEX concentrations in different lo...
Bioaccessiblity features of particulate bound toxic elements: Review of extract...
Mishra, A; Pervez, S; Candeias, C; Verma, M; Bano, S; Dugga, P; Verma, SR; Tamrakar, A; Shafi, S; Pervez, YF; Gupta, VFor a better and accurate risk assessment of metal toxicity, the concentration of the bioaccessible fraction (BAF) is more relevant than the total metal concentration. This review describes different extraction methods with different leaching agents for various chemical forms of elements such as As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn in ambient particulate matter (APM). Several leaching agents simulating the hum...
Temporal fluctuations in water contamination from abandoned pyrite Wieściszowic...
Costa, MR; Marszałek, H; da Silva, EF; Mickiewicz, A; Wąsik, M; Candeias, CProduction of acid mine drainage may occur during mining operations and may continue for many years after closure. In some cases, especially when host rock is capable of reacting with acidic drainage, metal concentrations may decrease over time and distance. Seasonal variations in water flow rate also play an important role in metals concentration both in surface and groundwater. The present study evaluates the...
Baseline maps of potentially toxic elements in the soils of Garhwal Himalayas, ...
Kumar, A; Pinto, MC; Candeias, C; Dinis, PAGeochemical mapping is frequently used to identify the regions of the Planet with critical chemical elements and their natural or anthropogenic sources. In order to understand elements' geochemistry and to identify the area's potentially harmful associations, high-resolution maps of chemical elements, physico-chemical parameters, a noncarcinogenic hazard index, and a potential ecological risk index were modelle...
Geochemical, Mineralogical and Morphological Characterisation of Road Dust and ...
Candeias, C; Vicente, E; Tomé, M; Rocha, F; Ávila, P; Alves, CRoad dust resuspension, especially the particulate matter fraction below 10 µm (PM10), is one of the main air quality management challenges in Europe. Road dust samples were collected from representative streets (suburban and urban) of the city of Viana do Castelo, Portugal. PM10 emission factors (mg veh-1 km-1) ranging from 49 (asphalt) to 330 (cobble stone) were estimated by means of the United Stated Environ...
Fine Particulate Matter and Gaseous Compounds in Kitchens and Outdoor Air of Di...
Alves, C; Vicente, A; Oliveira, AR; Candeias, C; Vicente, E; Nunes, T; Cerqueira, M; Evtyugina, M; Rocha, F; Almeida, SMPassive diffusion tubes for volatile organic compounds (VOCs) and carbonyls and low volume particulate matter (PM2.5) samplers were used simultaneously in kitchens and outdoor air of four dwellings. PM2.5 filters were analysed for their carbonaceous content (organic and elemental carbon, OC and EC) by a thermo-optical technique and for polycyclic aromatic hydrocarbon (PAHs) and plasticisers by GC-MS. The morpho...
Mineralogy and chemistry of incrustations resulting from the 2014-2015 eruption...
Silva, TP; De Oliveira, DPS; Veiga, JP; Avila, P; Candeias, C; Salas-Colera, E; Caldeira, RThe last eruption of the Fogo volcano, in the Cape Verde Archipelago, occurred in 2014-2015. A mineralogical and chemical study was undertaken on fumarole incrustations resulting from this event and compared with results obtained from the previous 1995 eruption. The mineralogical constitution of the fumarole deposits was assessed by X-ray diffraction and the chemical characterization was performed through X-ray...
Review of the nature of some geophagic materials and their potential health eff...
Kambunga, SN; Candeias, C; Hasheela, I; Mouri, HThe voluntary human consumption of soil known as geophagy is a global practice and deep-rooted in many African cultures. The nature of geophagic material varies widely from the types to the composition. Generally, clay and termite mound soils are the main materials consumed by geophagists. Several studies revealed that gestating women across the world consume more soil than other groups for numerous motives. Th...
The geochemistry of geophagic material consumed in Onangama Village, Northern N...
Kambunga, SN; Candeias, C; Hasheela, I; Mouri, HIngestion of geophagic materials might affect human health and induce diseases by different ways. The purpose of this study is to determine the geochemical composition of geophagic material consumed especially by pregnant women in Onangama Village, Northern Namibia and to assess its possible health effects. X-ray fluorescence and inductively coupled plasma mass spectrometry were used in order to determine the m...
Passive monitoring of particulate matter and gaseous pollutants in Fogo Island,...
Alves, CA; Candeias, C; Nunes, TV; Tome, MJC; Vicente, ED; Avila, PF; Rocha, FAn air quality monitoring campaign by passive sampling techniques was carried out, for the first time, between November 2016 and January 2017 on the Cape Verdean island of Fogo, whose volcanic mountain rises up to 2829 m. Levels of SO2 and acid gases (HF, HCl, HNO3, H2SO4 and H3PO4) were, in most cases, below the detection limits. Alkylpentanes, hexane, cycloalkanes and toluene were the dominant volatile organi...