ICUMSA Method GS1/3-7 (2011)
Material: Speciality Sugar, Raw Sugar
Analytes: Colour in solution
Method Technique: Spectrophotometry
Abstract:
This method is suitable for the determination of the solution colour of raw sugars, brown sugars and coloured syrups having a colour greater than 250 ICUMSA Units (IU).
The absorbancy of a filtered solution at pH 7.0 is measured at 420 nm in a spectrophotometer.
The method has Official Status but if a choice of method is available then ICUMSA recommends that Method GS9/1/2/3-8 is used preferentially.
For raw sugar the absolute difference between two results obtained under repeatability conditions should not be greater than 110 IU (for sugars between 500 IU and 2000 IU) and 300 IU (for sugars between 2000 IU and 7000 IU) and under reproducibility conditions 380 IU (500 IU to 2000 IU) and 960 IU (2000 IU to 7000 IU).
For brown sugars and coloured syrups the absolute difference between two results obtained under repeatability conditions should not be greater than 130 IU (for samples between 2200 IU and 2600 IU), 190 IU (for samples between 4300 IU and 5600 IU) and 1900 IU (for samples between 34000 IU and 42000 IU) and under reproducibility conditions 370 IU (2200 IU to 2600 IU), 1350 IU (4300 IU to 5600 IU) and 5230 IU (34000 IU to 42000 IU).
Online Access to ICUMSA Method GS1/3-7 (2011)
Access to the online Version of ICUMSA Method GS1/3-7 (2011) can be obtained from the Sugar Industry Website, operated by Bartens. The online access for two years costs EUR35 (+ 19 % VAT for German and EU citizens without EU VAT No.).