https://wicri-demo.istex.fr/Wicri/SolsUrbains/en/index.php?action=history&feed=atom&title=Sulphidic_material_%28WRB%29 2026-04-27T11:04:45Z Revision history for this page on the wiki MediaWiki 1.31.10 https://wicri-demo.istex.fr/Wicri/SolsUrbains/en/index.php?title=Sulphidic_material_(WRB)&diff=3393&oldid=prev 2017-06-28T17:36:10Z

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imported>Jacques Ducloy https://wicri-demo.istex.fr/Wicri/SolsUrbains/en/index.php?title=Sulphidic_material_(WRB)&diff=3392&oldid=prev 2011-07-25T08:51:46Z

<p></p> <p><b>New page</b></p><div>'''Sulphidic material''' is one of the diagnostic materials used, in the WRB system, to discriminate some soils from others.<br /> <br /> ==Description==<br /> Sulphidic material (from English ''sulphide'') is a waterlogged deposit containing S, mostly in the form of sulphides, and only moderate amounts of calcium carbonate.<br /> <br /> ==Diagnostic criteria==<br /> Sulphidic material has :<br /> * a pH (1:1 in water) of 4.0 or more and 0.75 percent or more S (dry mass) and less than three times as much calcium carbonate equivalent as S<br /> or :<br /> * a pH (1:1 in water) of 4.0 or more that, if the material is incubated as a layer 1 cm thick, at field capacity at room temperature, drops 0.5 or more units to a pH of 4.0 or less (1:1 in water) within 8 weeks.<br /> <br /> ==Field identification==<br /> In moist or wet conditions, deposits containing sulphides often show a golden shine, the colour of pyrite. Forced oxidation with a 30-percent hydrogen peroxide solution lowers the pH to 2.5 or less, the reaction may be vigorous in sunlight or on heating. Munsell colours range: hues of N, 5 Y, 5 GY, 5 BG, or 5 G; values of 2, 3 or 4; chroma always 1. The colour is usually unstable, and blackens upon exposure. Sulphidic clay is usually practically unripe. If the soil is disturbed, a whiff of rotten eggs may be noticed. This is accentuated by application of 1 ''M'' HCl.<br /> <br /> ==RSG in which sulphidic material can be observed==<br /> <br /> {{#ask: [[Has for diagnostic material::{{PAGENAME}}]]<br /> | format=ul<br /> }}<br /> <br /> ==See also==<br /> <br /> * The [http://www.fao.org/ag/agl/agll/wrb/doc/wrb2007_corr.pdf FAO reference text], (2007 version)<br /> <br /> [[Category:Diagnostic materials (WRB)]]</div>

imported>Thierry Daunois