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Flow-injection fluorimetric determination of traces of calcium in brine

✍ Scribed by Hiroko Wada; Hiromichi Atsumi; Genkichi Nakagawa

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 367 KB
Volume: 261
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)80202-i

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✦ Synopsis

2-[(2-Ammo-5-methylphenoxyhnethyl)-6-metho~-8-am~n~u~nol~ne-N, N, N ', N '-tetraacetlc acid (Qum 2) reacts with c&rum ion to form a fluorescent complex (A(ex) 328 nm, A(em) 496 nm) Calcmm m brme could be determmed with Qum 2 m the presence of at least 24 mg I-' magnesium with a simple flow-mjectlon system Highly concentrated sodmm chlonde solution (ca 5 M) could be duectly injected mto the carrier contauung 0 05 M plperazme-N,N'-b&2-ethanesulphomc acid) (PIPES)-sodium hydroxide buffer The relative standard deviation was 3 5% for twelve mjectlons of 20 pg 1-l Ca The detectlon hmlt of calcmm was 3 4 pg 1 -' The senntlvltles were the same for samples not contammg and contauung sodium chloride The method permits the determmatlon of calcmm m chlor-alkali brme,

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