Baseline Trace Element Occurrence in Principal Aquifers in UK

Baseline Trace Element Occurrence in Principal Aquifers in UK

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Unformatted text preview: 299 CmPTER 14 S-RY AND CONCLUSIONS 14.1 Detailed results have been obtained for the occurrence and distribution of 26 minor and trace elements (Si, Sr, Ba, F, Br, I, Li, B, Fe, Mn, Cu, Zn, Al, As, Be, Cd, Co, Cr, La, MO, Ni Pb, SC, V, Y, Zr) in groundwaters from ten regions of the UK. These regions include representatives of all the major aquifers of the country including the Chalk, Permo-Triassic sandstones, Carboniferous sandstones, Millstone Grit, Old Red Sandstone, Lower Greensand, Wealden sands, Lincolnshire Limestone and the Carboniferous Limestone. In general the geochemistry of these aquifers is well understood and serves as a framework for interpretation. 44.2 Reconnaissance data are given for the occurrence of a further three elements (Sn, Bi, U) in some of these aquifers. 14.3 Special care has been taken to ensure that minimal or zero contamination has taken place during the sampling procedures so that reported data closely reflect the true “in situ” geochemical conditions. The data are thus representative of 'raw waters' and not treated waters that might be delivered at the tap. 14.4 Chemical analysis of the groundwaters has included measurement of physicochemical parameters (EH, pH, T, dissolved oxygen) at the well head so that full geochemical interpretations can be made. All samples were filtered (0.45 pm) and acidified to provide a standard reference condition for dissolved species, although it is concluded that for certain elements, e.g. Fe, Mn and Al, the results reflect the presence of some colloidal material....
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Baseline Trace Element Occurrence in Principal Aquifers in UK

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