The sucrose content of raw sugar , white sugar , some speciality sugars and plantation white sugar is determined by polarimetry in the visible (VIS) wavelength range (540 nm to 633 nm) and expressed in °Z of the international polarimetric sugar scale.
The international polarimetrical 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, .
Following this method, typical impurities are eliminated as far as possible by clarification using lead acetate.
The method is Officially adopted and may form the basis of sugar purchasing contracts.
The absolute difference between two results obtained under repeatability conditions should be not greater than 0.10 °Z.
The absolute difference between two results obtained under reproducibility conditions should be not greater than 0.25 °Z.
Precision data are determined and valid only for raw sugar in the range of 97.6 °Z to 99.98 °Z.
If a choice is available to the user for the determination of polarimetric sucrose content of white sugar, then ICUMSA recommends that Method GS2-1 is used preferentially.
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