International Organization for Standardization (ISO)
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ISO 11263:1994
Scope
Specifies an extraction method and analytical conditions to determine the content of soil phosphorus soluble in sodium hydrogen carbonate solution. Lays down colour development at room temperature and after heating to a high temperature. Applicable to all types of soils.
ISO 11263:1994 history
1994ISO 11263:1994 Soil quality - Determination of phosphorus - Spectrometric determination of phosphorus soluble in sodium hydrogen carbonate solution