Technical Guidance Sheet (TGS) on normal levels of contaminants in English soils : supplementary information : Arsenic (As) : Technical Guidance Sheet Supplementary Information TGS01s, July 2012

Defra. 2012 Technical Guidance Sheet (TGS) on normal levels of contaminants in English soils : supplementary information : Arsenic (As) : Technical Guidance Sheet Supplementary Information TGS01s, July 2012. Defra, 21pp. (Soils R&D Project SP1008)

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Abstract/Summary

Both the NSI (XRFS) and G-BASE data sets are derived from a soil sample that has been aggregated (composited) from a number of subsamples collected over the area of a site, rather than a single point sample. In the case of NSI this is 25 cores (subsamples) from a 20-m square (McGrath and Loveland 1992) whereas G-BASE is 5 cores, also from a 20-m square (Johnson et al. 2005; Fordyce et al. 2005). If a sample is collected as a single core, and the result is compared to the NBC, it is important to be aware that short-range variation (which can be substantial) for the single core sample will be potentially much greater than for the samples from which the NBC values are derived (Lark, 2012).

Item Type:	Publication - Report
Programmes:	BGS Programmes 2010 > Land Use, Planning and Development
Funders/Sponsors:	Defra
Date made live:	15 Oct 2012 14:33 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/19964

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