scholarly journals Contaminación ambiental por mercurio y la salud fisiológica y psicológica del poblador de Huepetuhe -Madre de Dios-2019

2021 ◽  
Vol 5 (6) ◽  
pp. 11435-11456
Keyword(s):  
Madre De Dios ◽  
Us Epa

Objetivo: Determinar la influencia de la contaminación ambiental por mercurio en la salud fisiológica y psicológica del poblador de Huepetuhe-Madre de Dios, 2019. Investigación tipo aplicada; método descriptivo y nivel descriptivo – correlacional, transversal; diseño no experimental, técnica observacional y encuesta. Muestra: 200 pobladores; instrumento: Cuestionario con 30 preguntas para evaluar la contaminación ambiental por mercurio en la salud fisiológica y psicológica, con escala de Likert y juicio de expertos. Complementariamente, se valoraron concentraciones de mercurio en las muestras de músculo comestible (500 gr/cada especie) de cinco especies de pescado fresco de alto consumo en la zona de estudio (Mota punteada, chambira, doncella, zungaro, paiche) por medio de espectroscopía de emisión atómica, superaron los límites máximos permisibles de 0.5 mg/kg y 0.3 mg/kg permitidos por la Organización Mundial de la Salud y el US-EPA respectivamente. Conclusiones: Existe alta relación inversa entre la contaminación ambiental por mercurio con la salud fisiológica y psicológica del poblador de Huepetuhe. En las muestras de pescado analizadas se detectó contaminación por mercurio en todas las especies, y dos especies sobrepasaron niveles máximos permisibles, generando riesgo para la salud en los pobladores.

Contaminación ambiental por mercurio y la salud fisiológica y psicológica del poblador de Huepetuhe -Madre de Dios-2019

2021 ◽  
Vol 5 (6) ◽  
pp. 11435-11456
Keyword(s):  
Madre De Dios ◽  
Us Epa

Objetivo: Determinar la influencia de la contaminación ambiental por mercurio en la salud fisiológica y psicológica del poblador de Huepetuhe-Madre de Dios, 2019. Investigación tipo aplicada; método descriptivo y nivel descriptivo – correlacional, transversal; diseño no experimental, técnica observacional y encuesta. Muestra: 200 pobladores; instrumento: Cuestionario con 30 preguntas para evaluar la contaminación ambiental por mercurio en la salud fisiológica y psicológica, con escala de Likert y juicio de expertos. Complementariamente, se valoraron concentraciones de mercurio en las muestras de músculo comestible (500 gr/cada especie) de cinco especies de pescado fresco de alto consumo en la zona de estudio (Mota punteada, chambira, doncella, zungaro, paiche) por medio de espectroscopía de emisión atómica, superaron los límites máximos permisibles de 0.5 mg/kg y 0.3 mg/kg permitidos por la Organización Mundial de la Salud y el US-EPA respectivamente. Conclusiones: Existe alta relación inversa entre la contaminación ambiental por mercurio con la salud fisiológica y psicológica del poblador de Huepetuhe. En las muestras de pescado analizadas se detectó contaminación por mercurio en todas las especies, y dos especies sobrepasaron niveles máximos permisibles, generando riesgo para la salud en los pobladores.

scholarly journals Polycyclic aromatic hydrocarbons (PAHs) in soils of an industrial area in semi-arid Uzbekistan: spatial distribution, relationship with trace metals and risk assessment

2021 ◽  
Author(s):  
Benjamin A. Musa Bandowe ◽  
Nosir Shukurov ◽  
Sophia Leimer ◽  
Michael Kersten ◽  
Yosef Steinberger ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Industrial Area ◽  
Copper Smelting ◽  
Contaminated Site ◽  
Background Concentration ◽  
Industrial Complex ◽  
Metal Mining ◽  
Quality Guidelines ◽  
Us Epa ◽  
Semi Arid

AbstractThe concentrations, composition patterns, transport and fate of PAHs in semi-arid and arid soils such as in Central Asia are not well known. Such knowledge is required to manage the risk posed by these toxic chemicals to humans and ecosystems in these regions. To fill this knowledge gap, we determined the concentrations of 21 parent PAHs, 4,5-methylenephenanthrene, 6 alkylated PAHs, and biphenyl in soils from 11 sampling locations (0–10, 10–20 cm soil depths) along a 20-km transect downwind from the Almalyk metal mining and metallurgical industrial complex (Almalyk MMC), Uzbekistan. The concentrations of Σ29 PAHs and Σ16 US-EPA PAHs were 41–2670 ng g−1 and 29–1940 ng g−1, respectively. The highest concentration of Σ29 PAHs occurred in the immediate vicinity of the copper smelting factory of the Almalyk MMC. The concentrations in topsoil decreased substantially to a value of ≤ 200 ng g−1 (considered as background concentration) at ≥ 2 km away from the factory. Low molecular weight PAHs dominated the PAH mixtures at less contaminated sites and high molecular weight PAHs at the most contaminated site. The concentration of Σ16 US-EPA PAHs did not exceed the precautionary values set by the soil quality guidelines of, e.g., Switzerland and Germany. Similarly, the benzo[a]pyrene equivalent concentration in soils near the Almalyk MMC did not exceed the value set by the Canadian guidelines for the protection of humans from carcinogenic PAHs in soils. Consequently, the cancer risk due to exposure to PAHs in these soils can be considered as low.

US EPA to evaluate cyclic siloxane

2020 ◽  
Vol 98 (39) ◽  
pp. 17-17
Author(s):  
Britt E. Erickson
Keyword(s):  
Cyclic Siloxane ◽  
Us Epa

US EPA takes tougher stance on new chemicals

2021 ◽  
Vol 99 (12) ◽  
pp. 14-14
Author(s):  
Britt E. Erickson
Keyword(s):  
Us Epa

scholarly journals Levels of Mercury, Methylmercury and Selenium in Fish: Insights into Children Food Safety

Toxics ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 39
Author(s):  
Grazia Barone ◽  
Arianna Storelli ◽  
Daniela Meleleo ◽  
Angela Dambrosio ◽  
Rita Garofalo ◽  
...  
Keyword(s):  
Health Benefit ◽  
Risk Groups ◽  
Threshold Concentration ◽  
Consumption Pattern ◽  
Molar Ratios ◽  
Regulatory Limits ◽  
Thermo Fisher Scientific ◽  
Us Epa ◽  
Daily Intakes ◽  
Large Predators

Total mercury (THg), methylmercury (MeHg), and selenium (Se) concentrations were measured in various commercially important fish species. The benefit–risk binomial associated with these chemicals was assessed in children through the probability of exceeding the provisional tolerable weekly intakes (PTWIs) of the contaminants and the Se recommended dietary allowance (RDA). The Se:Hg molar ratios, selenium health benefit values (HBVSe), and monthly consumption rate limits (CRmm) for each species were also calculated. THg and Se were analyzed by atomic absorption spectrophotometer (Shimadzu, Milan, Italy), while MeHg was determined by Trace Ultra gas chromatograph connected with a PolarisQ MS (Thermo Fisher Scientific, Waltham, MA, USA). None of the analyzed fish had Hg levels above the European Community regulatory limits, while most large predators had MeHg levels over the threshold concentration set by US EPA. The estimated weekly intakes of THg and MeHg exceeded in many cases the PTWIs and the Se estimated daily intakes were provided from 0.71% to 2.75% of the RDA. Se:Hg molar ratios above 1 and positive HBVSe index suggested that Se in fish could be enough to alleviate the potential toxic effect of Hg. However, high-risk groups as children should consume fish in moderation because a large consumption pattern, especially of swordfish and tunas, might be of concern for health.

scholarly journals Rapid Determination of Ethylene Oxide and 75 VOCs in Ambient Air with Canister Sampling and Associated Growth Issues

Separations ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 35
Author(s):  
Jason Hoisington ◽  
Jason S. Herrington
Keyword(s):  
Ethylene Oxide ◽  
Rapid Determination ◽  
Complex Mixture ◽  
Ambient Air ◽  
Gas Chromatography Mass Spectrometry ◽  
Average Accuracy ◽  
Relative Standard ◽  
Wide Range ◽  
Us Epa

A canister-based sampling method along with preconcentrator-Gas chromatography-Mass Spectrometry (GC-MS) analysis was applied to ethylene oxide (EtO or EO) and 75 other volatile organic compounds (VOCs) in ambient air. Ambient air can contain a large variety of VOCs, and thorough analysis requires non-discriminatory sampling and a chromatographic method capable of resolving a complex mixture. Canister collection of whole air samples allows for the collection of a wide range of volatile compounds, while the simultaneous analysis of ethylene oxide and other VOCs allows for faster throughput than separate methods. The method presented is based on US EPA Method TO-15A and allows for the detection of EtO from 18 to 2500 pptv. The method has an average accuracy of 104% and precision of 13% relative standard deviation (RSD), with an instrument run time of 32 min. In addition, a link between canister cleanliness and ethylene oxide growth is observed, and potential mechanisms and cleaning strategies are addressed.

The sediment of the Hostivar Reservoir (Prague, Czech Republic) as a memory of 45 years of pollution

2017 ◽  
Vol 28 (2) ◽  
pp. 204-213
Author(s):  
Lucie Soucková ◽  
Dana Kominkova
Keyword(s):  
Czech Republic ◽  
Design Methodology ◽  
Polyaromatic Hydrocarbons ◽  
Reservoir Sediment ◽  
Terrestrial Environment ◽  
Content Type ◽  
Sediment Extraction ◽  
History Of ◽  
Us Epa ◽  
Practical Implications

Purpose The purpose of this paper is to evaluate the historical pollution of the Hostivar Reservoir (largest reservoir in Prague) sediment by metals, polyaromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB) and identify the trends in pollution of aquatic environment. Design/methodology/approach Core samples, 140 cm long, recording the 45-year history of the reservoir, were separated to 5 cm width subsamples (approximately 1.5 years of sedimentation) and analyzed for metals (Cd, Pb, Cu, Zn, Cr, Ni, Al), PAH and PCB. Following methods were used: US EPA 3051 for metals, US EPA 505 and US EPA 8082 A for PCB, and ISO 18287:2006 for PAH. Findings Most of the contaminants had the highest concentration at the beginning of the existence of the reservoir, suggesting that the contamination results from construction activities. Significant decrease of Pb occurred in the second half of the 1990s. It was caused by termination of the addition of lead as a detonation suppressant to the gasoline. Most concentrations of PAHs, PCBs and metals, except copper do not present eco-toxicological risk. Practical implications The results show the volume of priority pollutants removed from the reservoir by sediment extraction, and point risk to the terrestrial environment due to application of the sediment in the construction of a noise protecting wall. Originality/value The paper presents unique data about historical contamination of the largest reservoir in Prague, the capital of Czech Republic. It shows how the watershed and the construction phase of the dam cause a pollution of the reservoir sediment and possible environmental risk for aquatic biota.

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