ICUMSA Method GS6-5 (2007)

α-Amino Nitrogen in Sugar Beet by the Copper Method (‘Blue Number’) after Defecation with Aluminium Sulphate – Official

ICUMSA Method GS6-5 (2007)
Method Technique:

This method is used for the determination of α-amino nitrogen in sugar beet brei. The method is applicable to aluminium sulphate filtrates. Defecation with aluminium sulphate is possible, providing a double beam photometer for measurement of absorbancy is utilised. The inherent colour of the aluminium clarified sample liquid is compensated by measuring its corresponding absorbancy in the reference cell of the double beam photometer. Statistical data on the repeatability and reproducibility of the method were determined as follows:

Average nitrogen content in mmol/kg beet Repeatability r mmol/kg Reproducibility R mmol/kg
15.83 1.33 3.32

Online Access to ICUMSA Method GS6-5 (2007)

Access to the online Version of ICUMSA Method GS6-5 (2007) can be obtained from the Sugar Industry Website, operated by Bartens. The online access for two years costs EUR30 (+ 19 % VAT for German and EU citizens without EU VAT No.).