Schedule B3 - COAG Standing Council on Environment and Water
Schedule B3 - COAG Standing Council on Environment and Water
Schedule B3 - COAG Standing Council on Environment and Water
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10.3.2 Principle<br />
The sample is shaken in a 1:5 soil:water extract, or in some cases a calcium phosphate soluti<strong>on</strong><br />
(Tabatabai 1982) (500 mg phosphorus/L) <strong>and</strong> the resulting extractant subsequently analysed<br />
(APHA Method 4110). In the latter, phosphate i<strong>on</strong>s displace adsorbed sulfate while calcium i<strong>on</strong>s<br />
depress extracti<strong>on</strong> of soil organic matter <strong>and</strong> thus eliminate interference from extractable<br />
organic sulphur.<br />
10.4 Sulfide<br />
10.4.1 Scope <strong>and</strong> applicati<strong>on</strong><br />
This method (US EPA SW-846, Method 9030B) is suitable for soil samples c<strong>on</strong>taining 0.2<br />
mg/kg–50 mg/kg of sulfide. It measures ’total‘ sulphide, usually defined as acid-soluble<br />
sulfide. For soils with significant metal sulfides, total sulfide is defined as both the acid-soluble<br />
<strong>and</strong> acid-insoluble fracti<strong>on</strong>s, <strong>and</strong> both procedures must be employed.<br />
10.4.2 Principle<br />
For acid-soluble sulfides, sulfide is separated out by adding sulfuric acid to a heated sample. For<br />
acid-insoluble sulfides (for example, metal sulfides such as CuS, SnS 2 ) sulfide is separated by<br />
suspending the sample in c<strong>on</strong>centrated hydrochloric acid with vigorous agitati<strong>on</strong>.<br />
<str<strong>on</strong>g>Schedule</str<strong>on</strong>g> <str<strong>on</strong>g>B3</str<strong>on</strong>g> - Guideline <strong>on</strong> laboratory analysis of potentially c<strong>on</strong>taminated soils 31
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