On-line column preconcentration for the determination of cobalt in sea water by flow-injection chemiluminescence detection |
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Authors: | Shizuko Hirata Yukimasa Hashimoto Masato Aihara G. Vitharana Mallika |
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Affiliation: | (1) Chugoku National Industrial Research Institute, 2-2-2 Hiro-suehiro Kure, Hiroshima, 737-01, Japan;(2) Kinki University, Takaya Umenobe, Higashi, Hiroshima-shi, 729-19, Japan;(3) Ceylon Institute of Scientific and Industrial Research, 363 Banddhaloka Mawatha, Colombo, 7, Sri Lanka |
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Abstract: | A flow-injection method for the determination of dissolved cobalt(II) in sea water has been studied based on a combination of column preconcentration using 8-quinolinol immobilized on silica gel, fluoride containing metal alkoxide glass (8HQ-MAF) and chemiluminescence detection with a gallic acid-hydrogen peroxide system. Co(II) is selectively recovered from an acidified sample with 8-quinolinol immobilized on silica gel. After elution with dilute hydrochloric acid the resultant eluent is mixed with the reagent solutions, heated to 60°C and then introduced into the CL cell. The analysis time including the 2-min sample load was 8 min per sea water sample with a corresponding detection limit of 0.62 ngl-1 (3). The average standard deviation calculated for 10 replicate measurements of artificial sea water samples with a concentration of 10 ngl-1 cobalt was ±2.1%. The method has been tested with the standard reference sea waters NASS and CASS. |
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