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Spectrophotometic flow injection determination of lead in port wine using in-line ion-exchange concentration
Teresa I. M. S. Lopes, António O. S. S. Rangel, Raquel P. Sartini and Elias A. G. Zagatto
Analyst, 1996, 121, 1047 - 1050,
http://dx.doi.org/10.1039/AN9962101047