DIN Standards Committee Food and Agricultural Products
Soil improvers and growing media - Extraction of aqua regia soluble elements
Abstract
This European Standard specifies a method for the routine extraction of aqua regia soluble elements (as listed in annex B) from soil improvers or growing media. Materials containing more than about 28 % (m/m) organic matter will require treatment with additional nitric acid. With high solute concentrations in extract solutions, spectral interference's and background enhancement should be expected. The method is not applicable to liming materials and preformed materials such as mineral wool slabs and foam slabs. NOTE 1 Aqua regia will not totally dissolve most soil improvers or growing media, and the efficiency of extraction for particular elements differs from element to element. Such efficiency might also differ for the same element in different matrices. Elements extractable in aqua regia cannot therefore, be described as "Totals"; conversely they cannot be regarded as the "bio-available" fraction, as the extraction procedure is too vigorous to represent any biological process. NOTE 2 The requirements of the standard may differ from the national legal requirements for the declaration of the products concerned.
Begin
2022-12-31
WI
00223101
Planned document number
prEN 13650 rev
Responsible national committee
NA 057-03-01 AA - Soil improvers and growing media
Responsible european committee
CEN/TC 223/WG 4 - Analytical methods
previous edition(s)
Soil improvers and growing media - Extraction of aqua regia soluble elements
2001-09
