Fluoride is a natural and anthropic pollutant of ground waters that can have harmful effects on human health. Concentrations in drinking water exceeding 1.5 mg/L have been shown to cause dental fluorosis, whereas concentrations exceeding 4.0 mg/L cause fluorosis of the bone .[1]. According to the World Health Organization (WHO) recommendation and Italian drinking water standards, the maximum permissible limit of fluoride in drinking water is 1.5 mg/L F-. A recent hydrogeochemical and hydrogeological study, carried out on the groundwater of volcaniclastic aquifers of the Neapolitan area (Fig. 1), showed concentrations of F- greater than 3.0 mg/L. In this work, we intend to study the acid-base behavior of the tuff varieties Neapolitan area, (Campanian Ignimbrite and Neapolitan Yellow Tuff) and the adsorption equilibria of the fluoride at 25° C, in 0.1 M NaClO4. Furthermore the adsorbent properties of pyroclastic soils, sampled at different depths in a borehole, towards fluoride ions have been studied. Finally, a comparison was made between the adsorbent properties of stale samples with solid phases such as AlPO4(S) and Al2O3(S), used for the removal of fluoride Ion from the water (Fig.2).
Adsorption of fluoride onto tuff varieties of the Neapolitan area
S. Coda;
2018-01-01
Abstract
Fluoride is a natural and anthropic pollutant of ground waters that can have harmful effects on human health. Concentrations in drinking water exceeding 1.5 mg/L have been shown to cause dental fluorosis, whereas concentrations exceeding 4.0 mg/L cause fluorosis of the bone .[1]. According to the World Health Organization (WHO) recommendation and Italian drinking water standards, the maximum permissible limit of fluoride in drinking water is 1.5 mg/L F-. A recent hydrogeochemical and hydrogeological study, carried out on the groundwater of volcaniclastic aquifers of the Neapolitan area (Fig. 1), showed concentrations of F- greater than 3.0 mg/L. In this work, we intend to study the acid-base behavior of the tuff varieties Neapolitan area, (Campanian Ignimbrite and Neapolitan Yellow Tuff) and the adsorption equilibria of the fluoride at 25° C, in 0.1 M NaClO4. Furthermore the adsorbent properties of pyroclastic soils, sampled at different depths in a borehole, towards fluoride ions have been studied. Finally, a comparison was made between the adsorbent properties of stale samples with solid phases such as AlPO4(S) and Al2O3(S), used for the removal of fluoride Ion from the water (Fig.2).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
