Description
The sucrose content of raw sugar, white sugar and some speciality sugars is determined by polarimetry in the near infrared (NIR) wavelength range (here typically 800 nm to 900 nm) and expressed in °Z of the international polarimetric sugar scale.
The international polarimetric sugar scale is exactly valid only for solutions of pure sucrose in water.
Deviations from the true sucrose content depend on the amount and kind of impurities.
Measurement in the NIR-range is nearly independent of coloured impurities, optically active impurities, however, will cause deviations.
The method is Officially adopted and may form the basis of sugar purchasing contracts, results, however, should be reported accompanied by a statement that “polarimetric measurement has been carried out without wet lead clarification”.
The absolute difference between two results obtained under repeatability conditions should be not greater than 0.16 °Z.
The absolute difference between two results obtained under reproducibility conditions should be not greater than 0.27 °Z.
Precision data are determined and valid only for raw sugar in the range of 97.5 °Z to 99.9 °Z.
If a choice is available to the user for the determination of polarimetric sucrose content of raw sugar, then ICUMSA® recommends that Method GS1-1 is used preferentially.
For further information, please visit the homepage of this product.
Conditions of Use
Single ICUMSA® Methods are only offered digitally. The subscription license includes two year access to the method, which can be read on sugarindustry.info.
The Method cannot be downloaded, shared or duplicated. Please note the Copyright, Licensing and Trademark Policy of ICUMSA© and Bartens.
Access to Method
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Method Abstract
Please click here to open ICUMSA Method GS1-2 (2022).