Hnojiva

This document specifies a method for the determination of hexavalent chromium (CrVI) in soil improvers and growing media.

The method described is suitable to quantify the Cr(VI) content in soil improvers and growing media down to 1 mg/kg dry matter.

NOTE          Samples with a low dry matter content can have an influence on the achievable limit of quantification as defined in the scope.

The results obtained from this method are strictly dependent on the extraction conditions. Results obtained by using other extraction procedures (extraction solution, pH of the extraction solution, extraction time, extraction temperature, etc.) are not comparable with the results produced by the procedure described in this document.

This document specifies a method for the determination of nitrogen in soil improvers and growing media. The dry combustion method was developed originally as a manual method by Dumas [4]. Its application is improved greatly due to the use of modern automated equipment and is applicable to all forms of nitrogen.

This document specifies a method for the determination of hexavalent chromium (CrVI) in soil improvers and growing media.

The method described is suitable to quantify the Cr(VI) content in soil improvers and growing media down to 1 mg/kg dry matter.

NOTE          Samples with a low dry matter content can have an influence on the achievable limit of quantification as defined in the scope.

The results obtained from this method are strictly dependent on the extraction conditions. Results obtained by using other extraction procedures (extraction solution, pH of the extraction solution, extraction time, extraction temperature, etc.) are not comparable with the results produced by the procedure described in this document.

This document specifies a method for the determination of elements in soil improvers or growing media extracts using inductively coupled plasma-atomic emission spectrometry (ICP-AES).

NOTE 1       Alternatively, other suitable analytical techniques, e.g. inductively coupled plasma mass spectrometry (ICP-MS) or atomic absorption spectrometry (AAS), are suitable for the measurement if the user proves that the method gives the same results.

This method is applicable to aqua regia extracts prepared according to prEN 13650:2025.

NOTE 2       The method is suitable for the determination of other elements, provided the user has verified the applicability.

This document specifies a method for the determination of elements in soil improvers or growing media extracts using inductively coupled plasma-atomic emission spectrometry (ICP-AES).

NOTE 1       Alternatively, other suitable analytical techniques, e.g. inductively coupled plasma mass spectrometry (ICP-MS) or atomic absorption spectrometry (AAS), are suitable for the measurement if the user proves that the method gives the same results.

This method is applicable to aqua regia extracts prepared according to prEN 13650:2025.

NOTE 2       The method is suitable for the determination of other elements, provided the user has verified the applicability.