Some Aspects of Calcium Phosphate Chemistry in Sugarcane Clarification

Doherty, William O.S. & Rackemann, Darryn (2008) Some Aspects of Calcium Phosphate Chemistry in Sugarcane Clarification. In Bruce, R.C. (Ed.) 30th Australian Society of Sugar Cane Technologists Conference, 29 April to 2 may 2008, Townsville.

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THIS PAPER reviews some aspects of calcium phosphate chemistry since phosphate in juice is an important parameter in all sugar juice clarification systems. It uses basic concepts to try and explain the observed differences in clarification performance obtained with various liming techniques. The paper also examines the current colorimetric method used for the determination of phosphate in sugar juice. In this method, a phosphomolybdate blue complex formed due to the addition of a dye is measured at 660 nm. Unfortunately, at this wavelength there is interference of the colour arising from within the juice and results in the underestimation of the amount of soluble inorganic phosphate content of juice. It is suggested that phosphate analysis be conducted at the higher wavelength of 875 nm where the interference of the juice colour is minimised.

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ID Code: 15520
Item Type: Conference Paper
Refereed: Yes
Additional Information: Self-archiving of the author-version is not yet supported by this publisher.
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ISSN: 0726-0822
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100) > Separation Science (030108)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 Australian Society of Sugar Cane Technologists (ASSCT)
Deposited On: 07 Nov 2008 00:00
Last Modified: 29 Feb 2012 13:42

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