Some aspects of calcium phosphate chemistry in sugarcane clarification
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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|Item Type:||Journal Article|
|Keywords:||absorbance, calcium phosphate, clarification chemistry, colorimetric method, liming|
|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) > OTHER CHEMICAL SCIENCES (039900) > Industrial Chemistry (039903)
|Divisions:||Current > Research Centres > Centre for Tropical Crops and Biocommodities|
Past > QUT Faculties & Divisions > Faculty of Science and Technology
|Copyright Owner:||Copyright 2008 William O.S. Doherty and Darryn W. Rackemann|
|Deposited On:||06 Sep 2010 12:14|
|Last Modified:||23 Oct 2013 11:45|
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