Distribution and etermination of Manganese in Clam Shell by Graphite Furnace-Atomic Absorption Spectrometry and Neutron Activation Analysis

Abstract

Manganese contents and distribution in a clam shell were determined by graphite furnaceatomic absorption spectrometry and neutron activation analysis. The effect of several acids and major constituent elements in clam shell on atomic absorption spectrometry of 10 ppb manganese was studied. Hydrochloric acid, nitric acid, sulfuric acid and 10⁴-10⁶ fold amounts of calcium, magnesium and aluminum showed no significant interference. Therefore, in the present study, the direct determination of manganese in nitric acid-dissolved solutions of clam shell was carried out, using both the calibration curve and standard addition methods. The manganese content, 0.61-7.30μg/g, obtained by these experiments were in good agreement with the data obtained by solvent extraction-graphite furnace atomic absorption spectrometry and neutron activation analysis. Clear correlation between the manganese concentration in clam shells and the length from on umbo was shown.