Date ( Creation )

2012

Identifier

http://data.bgs.ac.uk/id/dataHolding/13605688

Maintenance and update frequency

asNeeded As needed

GEMET - INSPIRE themes

• Geology

BGS Thesaurus of Geosciences

• Soil chemistry , Arsenic , Nickel , Cadmium , Lead , Chromium

Keywords

• NERC_DDC

Access constraints

otherRestrictions Other restrictions

Use constraints

otherRestrictions Other restrictions

Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints

The dataset is made available to external clients under BGS Digital Data Licence terms and conditions. Revert to the IPR Section (iprdigital@bgs.ac.uk ) if further advice is required with regard to permitted usage.

Spatial representation type

vector Vector

Denominator

50000

Metadata language

English English

Topic category

• Geoscientific information

Geographic identifier

GBN

 

Date ( Revision )

2009

Geographic identifier

GREAT BRITAIN [id=139600]

 

Date ( Creation )

1979

N

S

E

W

Supplemental Information

User Guide for the BGS Soil Chemistry Data for Environmental Assessments (BGS Open Report OR/12/050)

Distribution format

• ()

OnLine resource

BGS Homepage  

The BGS Homepage is an entry point to the BGS data services.

Hierarchy level

dataset Dataset

Other

dataset

Statement

Soil geochemical surveys have been carried out at 24 urban centres in England, Scotland and Wales. Most of the surveys were undertaken by the BGS as part of the Geochemical Surveys of Urban Environments (GSUE) project (Fordyce et al., 2005), whereas London, Wolverhampton, Manchester and Glasgow were sampled as part of larger multi-disciplinary projects. The concentrations of many potentially harmful elements including arsenic (As), cadmium (Cd), chromium (Cr), nickel (Ni), and lead (Pb) are above 'natural' background in urban environments as a result of a range of contaminative processes. Urban geochemical surveying is based on the collection of samples on a 500 m grid at a density of approximately 4 samples per km2 across the urban areas. Samples were collected from open ground as close as possible to the centre of each 500 m grid cell. At each sample site, composite samples based on 5 sub-samples taken at the centre and four corners of a 20m square, were collected from the topsoil ('A' soil sample; 5-20 cm depth) and subsurface ('S' soil sample; 35-50 cm depth). Approximately 40 chemical elements were determined in the <2mm size fraction of the 'A' soils. The Measured Urban Soil Chemistry data contain analysed results from these sampling campaigns. The Estimated Urban Soil Chemistry indicates the estimated topsoil total As, Cd, Cr, Ni and Pb concentrations (mg kg-1) derived by spatial interpolation of the point source urban soil chemistry data. Urban soil geochemical data generally have large positive skewness coefficients so were transformed by taking natural logarithms. To overcome the bias associated with traditional measures of location (mean) and scale (standard deviation) for log-normal data, the inverse distance weighted (IDW) mean and standard deviation of log transformed.

gmd:MD_Metadata

File identifier

cfa052c4-6d04-4905-e044-0003ba9b0d98   XML

Metadata language

English English

Hierarchy level

dataset Dataset

Date stamp

2021-09-17

Metadata standard version

2.3

Dataset URI

http://data.bgs.ac.uk/id/dataHolding/13605688