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El-Sayed, AA.Y., Hussein, Y.Z. & Mohammed, M.A. Simultaneous Determination of Phosphate and Silicate by First-Derivative Spectrophotometry. ANAL. SCI. 17, 1461–1464 (2001). https://doi.org/10.2116/analsci.17.1461
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DOI: https://doi.org/10.2116/analsci.17.1461