- MeSH
- dentální fluoróza etiologie prevence a kontrola MeSH
- fluor * analýza škodlivé účinky MeSH
- lidé MeSH
- pitná voda * chemie normy škodlivé účinky MeSH
- podzemní voda chemie MeSH
- vodní zdroje normy MeSH
- znečištění vody * MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Etiopie MeSH
There are two principal sources of arsenic in Zimapán. Point sources are linked to mining and smelting activities and especially to mine tailings. Diffuse sources are not well defined and are linked to regional flow systems in carbonate rocks. Both sources are caused by the oxidation of arsenic-rich sulfidic mineralization. Point sources are characterized by Ca-SO(4)-HCO(3) ground water type and relatively enriched values of deltaD, delta(18)O, and delta(34)S(SO(4)). Diffuse sources are characterized by Ca-Na-HCO(3) type of ground water and more depleted values of deltaD, delta(18)O, and delta(34)S(SO(4)). Values of deltaD and delta(18)O indicate similar altitude of recharge for both arsenic sources and stronger impact of evaporation for point sources in mine tailings. There are also different values of delta(34)S(SO(4)) for both sources, presumably due to different types of mineralization or isotopic zonality in deposits. In Principal Component Analysis (PCA), the principal component 1 (PC1), which describes the impact of sulfide oxidation and neutralization by the dissolution of carbonates, has higher values in samples from point sources. In spite of similar concentrations of As in ground water affected by diffuse sources and point sources (mean values 0.21 mg L(-1) and 0.31 mg L(-1), respectively, in the years from 2003 to 2008), the diffuse sources have more impact on the health of population in Zimapán. This is caused by the extraction of ground water from wells tapping regional flow system. In contrast, wells located in the proximity of mine tailings are not generally used for water supply.
- MeSH
- analýza hlavních komponent MeSH
- arsen analýza MeSH
- časové faktory MeSH
- chemické látky znečišťující vodu analýza MeSH
- difuze MeSH
- geologické sedimenty analýza chemie MeSH
- hornictví MeSH
- izotopy analýza chemie MeSH
- kyslík analýza MeSH
- monitorování životního prostředí MeSH
- oxidace-redukce MeSH
- pohyb vody MeSH
- sírany analýza MeSH
- sulfidy analýza MeSH
- uhličitany analýza MeSH
- zásobování vodou analýza MeSH
- zeměpis MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Mexiko MeSH
