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The samples that had copper, lead and zinc grades of greater than 1%, and silver grades of over 100g/t underwent a second analysis in which grams of pulp was digested in a mixture of four acids and the resulting liquid was diluted and analyzed by ICPMS.
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Screening tests for elevated blood lead levels include free erythrocyte (or zinc) protoporphyrin levels and capillary or venous blood lead levels. Erythrocyte (or zinc) protoporphyrin is insensitive to modest elevations in blood lead levels and lacks specificity.
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