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Abstract
Biogeochemical maps determined from the distribution of sparsely sampled cadmium have been improved by the incorporation of more densely sampled zinc with which it is correlated and by the application of cokriging. The inherent variability of both elements, together with their correlation with each other, can be accounted for in terms both of multivariate statistics and spatial position using the “variogram”. A measure of reliability of estimation provided by cokriging enhances the design of future biogeochemical mapping programmes.