Application of response surface methodology (RSM) for experimental optimization in biogenic silica extraction from rice husk and straw ash by Yigezu Temesgen Zewide, Temesgen Atnafu Yemata, Adane Adugna Ayalew, Hawi Jihad Kedir, Asab Alemneh Tadesse, Asmarech Yeshaneh Fekad, Alemayehu Keflu Shibesh, Fentahun Adamu Getie, Tegen Dagnew Tessema, Tessera Alemneh Wubieneh, Wondmagegn Wonago Kululo, Muluken Tilahun Mihiret

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