The use of composite samples to reduce the time and cost of chemical analysis is discussed. It is shown when composite samples can be used without affecting predefined project objectives. Furthermore, it is also demonstrated when they should not be used, and also how much information is lost due to their use. The study presents a comparison of data concentrations of some major (Al2O3, CaO, Fe2O3, K2O, P2O5, TiO2) and trace elements (Cd, Co, Cr, La, Rb, Sr, Th, Tl, U, Zn) in European topsoil and subsoil produced by FOREGS (Forum of European Geological Surveys) and two other data sets derived by compositing the five individual samples in each 160×160 km cell of the Global Terrestrial Network (GTN); the first by physically compositing the samples, and analysing the composites, and the second by artificially compositing the samples in each GTN cell.
Mapping geochemical patterns at regional to continental scales using composite samples to reduce the analytical costs / Cicchella, D.; Lima, Annamaria; Birke, M.; Demetriades, A.; Yao, W.; Xie, X.; DE VIVO, Benedetto. - In: JOURNAL OF GEOCHEMICAL EXPLORATION. - ISSN 0375-6742. - STAMPA. - 124:(2013), pp. 79-91. [10.1016/j.gexplo.2012.08.012]
Mapping geochemical patterns at regional to continental scales using composite samples to reduce the analytical costs
LIMA, ANNAMARIA;DE VIVO, BENEDETTO
2013
Abstract
The use of composite samples to reduce the time and cost of chemical analysis is discussed. It is shown when composite samples can be used without affecting predefined project objectives. Furthermore, it is also demonstrated when they should not be used, and also how much information is lost due to their use. The study presents a comparison of data concentrations of some major (Al2O3, CaO, Fe2O3, K2O, P2O5, TiO2) and trace elements (Cd, Co, Cr, La, Rb, Sr, Th, Tl, U, Zn) in European topsoil and subsoil produced by FOREGS (Forum of European Geological Surveys) and two other data sets derived by compositing the five individual samples in each 160×160 km cell of the Global Terrestrial Network (GTN); the first by physically compositing the samples, and analysing the composites, and the second by artificially compositing the samples in each GTN cell.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
