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New PDF release: Analytical Methods in Geochemical Prospecting

By William K. Fletcher

ISBN-10: 0444419306

ISBN-13: 9780444419309

ISBN-10: 0444419322

ISBN-13: 9780444419323

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Example text

954) to obtain σ0 and k, respectively. As an example the variation of oc with c for the determination of copper in soil samples, based on 50 duplicate analyses, is shown in Fig. 2-3. From the regression oc = σ0 + kc so that Pc is given by: This method of estimating Pc needs a minimum of 50 duplicate analyses. With fewer pairs it is still possible to judge if they conform to a particular precision by graphically comparing \Xi~X2\ versus (Χχ +X2)/2 with the distribution percentiles for Md at any specified precision.

954) to obtain σ0 and k, respectively. As an example the variation of oc with c for the determination of copper in soil samples, based on 50 duplicate analyses, is shown in Fig. 2-3. From the regression oc = σ0 + kc so that Pc is given by: This method of estimating Pc needs a minimum of 50 duplicate analyses. With fewer pairs it is still possible to judge if they conform to a particular precision by graphically comparing \Xi~X2\ versus (Χχ +X2)/2 with the distribution percentiles for Md at any specified precision.

A spectroscopist analyzing 10-mg samples will report 10 ppm, with good precision, and occasional wild highs of around 200 ppm. In contrast, a colorimetric analysis on 1-g samples would indicate an overall content of 20 ppm but precision would be poor due to the variable number of chromite grains. These examples clearly illustrate the extent to which concentrations and distributions of trace elements can become an artefact of laboratory sampling procedures. This is much more likely to be a major problem in an assay laboratory, but should also be taken into account in evaluating results whenever a trace element is likely to be present as a rare accessory mineral.

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Analytical Methods in Geochemical Prospecting by William K. Fletcher


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