THE SEDIMENTATION BEHAVIOURS OF AlPO4 AND Fe3(PO4)2 PRECIPITATES IN SOLUTIONS OF SODIUM CARBOXYMETHYLCELLULOSE AT DIFFERENT TEMPERATURES

To evaluate the sedimentation of aluminium phosphate [AlPO4] and ferrous [Fe3(PO4)2] precipitates in sodium carboxymethylcellulose (Na-CMC) biopolymer at different temperatures, batch-wise precipitation tests AlPO4 Fe3(PO4)2 solutions Na-CMC were carried out temperatures 30, 40 50oC. The objective was to determine On-set Sedimentation Rate (OSR) Volume Ratio (SVR) metal phosphates. Fixed volume concentrations mixed with constant known concentration ion precursor (disodium hydrogen solution) a measurement apparatus - PreSed Meter. resulting solution separately either or iron (II) (either chloride solution). settling precipitate so formed monitored recorded. Blank tests, without Na-CMC, also run. For every measurement, computed. It observed that absence readily dissolved into medium immediately after stirring. Also, OSR SVR increased directly temperatures. test results indicated suspension poorly influenced by biopolymer. Poor correlations (0.50 ≤ R2 ≥ 0.05) (0.49 0.005) indicating non-dependence concentration, implying no chemical interactions described for all investigated. suspension, good (R2 = 0.94) 0.93) dependence interaction obtained high temperature (50oC). observations imply would be stabilizing agent drug formulations containing AlPO4. However, need not stored conditions.