J. ShiowatanaK. BenyatianbA. SiripinyanondThe Institute of Science and Technology for Research and Development, Mahidol University2018-09-072018-09-072000-12-01Atomic Spectroscopy. Vol.21, No.5 (2000), 179-186019553732-s2.0-0034470674https://repository.li.mahidol.ac.th/handle/123456789/25904An enrichment of trace metals using the activated carbon method was investigated for the preconcentration of Cd, Co, Hg, and Ni in seawater after complexing with 150 mg mL-1 8-hydroxyquinoline, pH 6-10. The adsorbed activated carbon was prepared as a slurry in glycerol or in boiled tapioca suspension before electrothermal atomic absorption spectrometric measurement. A contact time of 5 minutes was adequate for quantitative adsorption. Slurry concentration between 1-10 % could be used. An enrichment factor of up to 20,000-fold was achieved, with recoveries ranging from 84-114%. At 3% slurry concentration, the detection limits for Cd, Co, Hg, and Ni in seawater were 0.0003, 0.007, 0.12 and 0.007 ng mL-1, respectively.Mahidol UniversityChemistryArticleSCOPUS