This European Standard specifies a method forThe routine extractioannex B) from soil improvers or growing media. Materials containingwill require treatment with additional nitric acid. With high soluteinterference's and background enhancement should be expected.n of aqua regia soluble elements (as listed inmore than about 28%(m/m) organic matterconcentrations in extract solutions, spectralThe method is not applicable to liming materials and preformed materials such as mineral wool slabs and foamslabs.NOTE 1 Aqua regia will not totally dissolve most soil improvers or growing media, andThe efficiency of extraction forparticular elements differs from element to element. Such efficiency might also differ forThe same element in different matricesElements extractable in aqua regia cannotTherefore, be described as "Totals"; converselyThey cannot be regarded asThe "bio-available" fraction, asThe extraction procedure is too vigorous to represent any biological processNOTE 2 The requirements of the standard may differ fromThe national legal requirements forThe declaration of the productsconcerned.
EN 13650:2001 history
2001EN 13650:2001 Soil improvers and growing media - Extraction of aqua regia soluble elements