Simultaneous Spectrophotometric Determination of Silicate and Phosphate by Flow Injection Analysis
F. Mas; J. M. Estela ; V. Cerda
International Journal of Environmental Analytical Chemistry, Volume 43, Issue 2 & 3 February 1991 , pages 71 - 78
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http://dx.doi.org/10.1080/03067319108026967Заранее спасибо!