@article{10272/12745,
year = {1996},
url = {http://hdl.handle.net/10272/12745},
abstract = {The topsoil of on arable field was characterized as homogeneous for major element contents by Xray fluorescence. Total concentrations o f potentially toxic metals, as extractable by aqua regia digestion, showed no heavy metal accumulation. The spatial behavior of EDTA extractable Pb, Ni and Cd in this field and its dependency on soil properties (pH organic carbon content, CEC and the texture) was investigated by sampling the topsoil according to a nested grid.
Extractable Pb, Ni and Cd were characterized geostatistically are found to be spatially dependent.
Semivariograms were described reasonably well by a structure involving a small nugget component plus a spatial component that becomes independent at distances of 50 m. Block-kriged contour maps allowed to Identify microrregions with significantly increased extractability.
Apparently organic matter content, CEC, silt content and pH are the most important soil parameters that regulate Pb, Ni and Cd extractability in this soil.
The number of soil composite cores required to assess a mean value with a specified confidence in analytical results was calculated},
publisher = {Sociedad Geológica de España},
title = {Extracción selectiva de Pb, Ni y Cd en un suelo no contaminado en relación con la heterogeneidad del mismo},
title = {Pb, Ni and Cd extractable contents in a non-polluted soil as related to soil heterogeneity},
author = {Paz González, A. and Taboada Castro, M. T.},
}