Flow-injection fluorimetric determination of traces of calcium in brine

2-[(2-Amino-5-methylphenoxy)methyl]-6-methoxy-8-aminoquinoline- N,N,N′,N′-tetraacetic acid (Quin 2) reacts with calcium ion to form a fluorescent complex (λ(ex) 328 nm, λ(em) 496 nm). Calcium in brine could be determined with Quin 2 in the presence of at least 24 mg 1 −1 magnesium with a simple flow...

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Bibliographic Details
Published in:Analytica chimica acta 1992-05, Vol.261 (1), p.275-279
Main Authors: Wada, Hiroko, Atsumi, Hiromichi, Nakagawa, Genkichi
Format: Article
Language:English
Subjects:
Analytical chemistry
Brine
Calcium
Chemistry
Exact sciences and technology
Flow system
Fluorimetry
Spectrometric and optical methods
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Summary:2-[(2-Amino-5-methylphenoxy)methyl]-6-methoxy-8-aminoquinoline- N,N,N′,N′-tetraacetic acid (Quin 2) reacts with calcium ion to form a fluorescent complex (λ(ex) 328 nm, λ(em) 496 nm). Calcium in brine could be determined with Quin 2 in the presence of at least 24 mg 1 −1 magnesium with a simple flow-injection system. Highly concentrated sodium chloride solution (ca. 5 M) could be directly injected into the carrier containing 0.05 M piperazine- N,N′- bis(2-ethanesulphonic acid) (PIPES)-sodium hydroxide buffer. The relative standard deviation was 3.5% for twelve injections of 20 μg 1 −1 Ca. The detection limit of calcium was 3.4 μg 1 −1. The sensitivities were the same for samples not containing and containing sodium chloride. The method permits the determination of calcium in chlor-alkali brine.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(92)80202-I