EN 16206:2012

Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus and equipment
6 Procedure
7 Calculation
8 Precision
9 Test report
Annex A (informative) - Results of the inter-laboratory test
Annex B (informative) - Flowchart - Determination of arsenic
        by hydride generation atomic absorption spectrometry
        (HGAAS) after microwave pressure digestion
        (digestion with 65% nitric acid and 30% hydrogen peroxide
Annex C (informative) - Alternative digestion procedure with the
        same digestion efficiency to ensure complete mineralization
        of all organic and inorganic arsenic species for HGAAS
        measurement: dry ashing with magnesium oxide and magnesium
        nitrate as ashing reagents
Bibliography

This European Standard specifies a method for the determination of total arsenic in animal feeding stuffs by hydride generation atomic absorption spectrometry (HGAAS) after microwave pressure digestion. The limit of quantification is 0,5 µg/l of the test solution. Using a test portion of 0,5 g, a volume of the test solution of 25 ml and an aliquot of 5 ml for pre-reduction the limit of quantification is 0,125 mg/kg in the feed material.NOTEFor feed materials containing organic arsenic species from compounds of marine origin (i.e. arsenobetaine and tetramethylarsine oxide) a higher digestion temperature of the microwave system up to 300 °C may be necessary in order to enable the hydridisation of these arsenic compounds and in order to determine all different kinds of arsenic species in the corresponding feeding stuffs. Alternatively, the digestion procedure of Annex D can be used if the microwave system does not reach higher temperatures up to 300 °C to ensure complete mineralization for HGAAS determination.