Low-density geochemical mapping in Portugal

Multivariate Statistical and GIS-Based Approach for the Identification of Mn and Ni Concentrations and Spatial Variability in Soils of a Humid Mediterranean Environment: La Rioja, Spain

“…In contrast, the total content of Mn in bottom layers presents values similar to the ones obtained in these studies. The average established as base level in Portugal is 580 mg kg −1 (Ferreira et al 2001) which is similar to the value established for surface layers.…”

“…For each of the parameters selected, the corresponding thematic maps have been elaborated, analyzing the potential for GIS to interpret and represent the data obtained. GIS software is increasingly used in environmental studies (Ozores-Hamton et al 1994;Corwing and Wagenet 1996;Ferreira et al 2001). Inverse distance weighting (IDW) was employed to delineate the spatial variation of Mn and Ni contents.…”

The quality of our drinking water: Aluminium determination with an acoustic wave sensor

“…It can be postulated the aluminium source to be linked to the granitic soil a Mean values ± the 95% confidence limit (n = 5). [23]. However, it is not the purpose of this work to explain why high aluminium concentration are found in some places, but to demonstrate that this new methodology, based on piezoelectric quartz sensors, is reliable and can be used to detect water sources not in accordance with the aluminium guideline value of 0.2 mg L −1 .…”

Geochemical characteristics of stream sediments, sediment fractions, soils, and basement rocks from the Mahaweli River and its catchment, Sri Lanka

“…A second split was then sieved to separate <180 m and 180-2000 m fractions for fractional analysis. The <180 m and 180-2000 m fractions are often used as the most appropriate and convenient fractions for the examination of stream sediment geochemistry (Amorosi et al, 2002;Ferreira et al, 2001;Koval et al, 1995;Licht and Tarvainen, 1996;Ortiz and Roser, 2006a,b). Consequently, the <180 m and 180-2000 m fractions were also used for this study.…”