Indirect cathodic-stripping voltammetric determination of ceftazidime as a mercury salt
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Elsevier B.V.
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At accumulation potentials close to +0.1 V at a hanging mercury drop electrode, ceftazidime is accumulated at pH 9.5, probably in a hydrolysed or otherwise chemically altered form, in an anodic process to give an adsorbed mercury salt. The accumulation of this mercury salt allows the indirect cathodic-stripping voltammetric determination of ceftazidime using the reduction peak of the mercury salt at -0.70 V. The high sensitivity of the method coupled with high sample dilution allows ceftazidime to be determined in milk samples at the 28 mu g ml(-1) level without prior separation. In order to determine lower levels of ceftazidime in milk (ca. 10 ng ml(-1)) a separation process would be required. (C) 1998 Elsevier B.V. B.V. All rights reserved.
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ceftazidime, cathodic-stripping voltammetry, milk, mercury salt
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Inglês
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Analytica Chimica Acta. Amsterdam: Elsevier B.V., v. 367, n. 1-3, p. 255-259, 1998.
