Abstract

The synergistic solvent extraction of Mn(II) by N-nitroso-N-phenylhydroxylamineammonium salt(cupferron) and tetrabutylammonium ion(TBA+) has been studied. In the presence of TBA+, over 95% Mn(II) was extracted from an aqueous solution into chloroform by the cupferron in the pH range of 4 to 10. But a part of Mn(II) was extracted with only cupferron. The ternary complex of Mn(II) was more efficiently extracted into CH2Cl2 and CHCl3 than other nonpolar solvents. The extracted Mn(II) was determined in the back-extracted HNO3 solution by GF-AAS. This fixed procedure was applied to the determination of trace Mn(II) in tap water samples of pH 5.0. The detection limit equivalent to 3 times standard deviation of the background absorption was 0.37 ng/mL and Mn(II) was determined with the range of 0.4 to 1.01 ng/mL in our laboratory's tap water. And the recovery was 94 to 107% in samples in which 2.0 ng/mL Mn(II) was spiked. The interferences of common concomitant elements such as Cu(II), Ca(II), Fe(III) and so on were not shown up to 10~20 ㎍/mL. From these results, this procedure could be concluded to be applied for the determination of trace Mn(II) in other environmental water samples.