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Flow-Injection Analysis of Cobalt(II) Utilizing Enhanced Lophine Chemiluminescence with Hydroxylammonium Chloride

✍ Scribed by Kenichiro Nakashima; Hiromi Yamasaki; Ryo Shimoda; Naotaka Kuroda; Shuzo Akiyama; Willy R. G. Baeyens

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 135 KB
Volume: 11
Category: Article
ISSN: 0269-3879
DOI: 10.1002/(sici)1099-0801(199703)11:2<63::aid-bmc634>3.0.co;2-u

No coin nor oath required. For personal study only.

✦ Synopsis

10 Ϫ 6 M concentrations were 2.3 and 4.5%, respectively.

The method was applied to the determination of cyanocobalamin, which is one of the components of commercially available eye lotion. Cyanocobalamin having Co(III) in its structure did not catalyse the lophine reaction. Thus decomposition of cyanocobalamin with KHSO 4 was performed as shown below. To 50 L of aqueous sample solution (1.0ϫ 10 Ϫ 6 -2ϫ 10 Ϫ 5 M) in a crucible was added 300 L of 0.05% KHSO 4 , and the mixture was heated to dryness on a burner. After cooling the residue was redissolved in 1.0 mL of water by vortex mixing, and the resultant solution was subjected to analysis. The CL intensity after the pretreatment was 58% of that with Co(II).

Four eye lotions were pretreated with KHSO 4 and K.

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