New Kaskus: Penutun Praktikum

<div dir="ltr" style="text-align: left;" trbidi="on"><div class="separator" style="clear: both; text-align: center;"><a href="http://i1160.photobucket.com/albums/q488/edhorima/3154993_ph212_zps32fb5068.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://i1160.photobucket.com/albums/q488/edhorima/3154993_ph212_zps32fb5068.jpg" /></a></div><br /> <br /><div class="MsoNormal"></div><div class="MsoNormal">Dasar penetapan </div><div class="MsoNormal"><span style="mso-tab-count: 1;">            </span>Nilai ph menunjukkan konsentrasi ino H<sup>+</sup>_ dalam larutan tanah, yang dinyatakan sebagai –log[H<sup>+</sup>]. Peningkatan konsentrasi H menaikkan potensial larutan yang diukur oleh alat dan dikonversi dalam skala pH. Electrode gelas merupakan electrode selektif khusus H, hingga memnungkinkan hanya mengukur potensial yang disebabkan kenaikan konsentrasi H. potensial yang timbul diukur berdasarkan potensial elektrode pembanding (kalomel atau AgCl). Biasanya digunakan satu elektrode yang sudah terdiri atas elektrode pembanding dan electrode gelas (elektrode kombinasi) </div><div class="MsoNormal">Peralatan</div><div class="MsoListParagraphCxSpFirst" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">         -</span></span></span>Neraca analitik ketelitian dua decimal</div><div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>-Botol kocok 100 ml</div><div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>Dispenser 50 ml gelas ukur</div><div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>Mesin pengocok</div><div class="MsoListParagraphCxSpMiddle" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>Labu semprot 500 ml</div><div class="MsoListParagraphCxSpLast" style="mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>pH meter</div><div class="MsoNormal">pereaksi</div><div class="MsoNoSpacing" style="margin-left: 36.0pt; mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>air bebas ion</div><div class="MsoNoSpacing" style="margin-left: 36.0pt; mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>larutan buffer pH 7,0 dan pH 4,0</div><div class="MsoNoSpacing" style="margin-left: 36.0pt; mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>KCl 1 M</div><div class="MsoNoSpacing" style="margin-left: 36.0pt;">Larutkan 74,5 g KCl p.a. dengan air bebas ion hingga 11.</div><div class="MsoNoSpacing"><br /></div><div class="MsoNoSpacing">Cara kerja</div><div class="MsoNoSpacing"><span style="mso-tab-count: 1;">            </span>Timbang 10 g contoh tanah sebanyak dua kali, masing-masing dimasukkan ke dalam botol kocok, ditambah 50 ml air bebas ion ke botol yang satu (pH H<sub>2</sub>O) dan 50 ml KCl 1 M ke dalam botol lainnya (pH KCl). Kocok dengan mesin pengocok selama 30 menit. Suspense tanah diukur dengan pH meter yang telah dikalibrasi menggunakan larutan buffer pH 7,0 dan pH 4,0. Nilai pH dilaporkan dalam 1 desimal.</div><div class="MsoNoSpacing">Catatan : </div><div class="MsoNoSpacing" style="margin-left: 36.0pt; mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>Prosedur tersebut menggunakan rasio 1:5</div><div class="MsoNoSpacing" style="margin-left: 36.0pt; mso-list: l0 level1 lfo1; text-indent: -18.0pt;"><span style="mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><span style="mso-list: Ignore;">-<span style="font: 7.0pt "Times New Roman";">          </span></span></span>Rasio dapat berubah sesuai jenis contoh dan permintaan<br /><br /><div class="separator" style="clear: both; text-align: center;"></div><br /><div class="separator" style="clear: both; text-align: center;"><a href="http://i1160.photobucket.com/albums/q488/edhorima/1_zpsed8ee522.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="264" src="http://i1160.photobucket.com/albums/q488/edhorima/1_zpsed8ee522.jpg" width="320" /></a></div></div><div class="MsoNoSpacing"><br /></div><div class="MsoNoSpacing">Daftar acuan</div><div class="MsoNoSpacing">ISRIC.1993.Procedures for Siol Analysis. In van Reeuwijk, L.P. (Ed.). Technical Paper, International Soil Reference and Information Centre. Wageningen, The Netherlands. 4<sup>th</sup> edition. p.100</div><div class="MsoNoSpacing"><br /></div><div class="MsoNoSpacing">Rayment, G.E. and F.R. Higginson. 1992. Australian laboratory handbook of soil and water chemicals methods. Australian soil and land survey handbook. Inkata Press, Melbourne, Sydney.p.330<br /><br /><br /> <br /><div class="MsoNormal"><br /></div><div class="MsoNormal"><br /></div><div class="MsoNormal">Sumber :</div><div class="MsoNormal">Penuntun praktikum analisis tanah, tanaman, air dan pupuk</div><div class="MsoNormal">Laboratorium Kesuburan Tanah dan Nutrisi Tanaman, Jurusan Ilmu Tanah dan Sumberdaya Lahan Fakultas Pertanian, Universitas Padjajaran, 2006</div>   </div></div>

Penetapan pH Tanah

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