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ABSTRACT
Palm oil (PO) was bought in an open market in Ekosodin, Ovia North East Local Government Area of Edo State and it was stored in opaque plastic container at room temperature and the peroxide value (PV), iodine value (IV), UV absorbance at 762nm (A762nm) and the electrical conductivity (EC) was determined every two days over a one-month period. The peroxide value and iodine value were determined using standard AOAC method. The absorbance values were determined with a UV/Vis. spectrophotometer and the electrical conductivity with a conductivity / DO meter. The peroxide value, absorbance and electrical conductivity increased while the iodine values decreased during storage. The changes in properties before and after storage for palm oil were PV(4.1 – 8.80meq/kg), IV(52.9 - 49.0gI2/g), A762nm(0.630-1.350) and EC(6.42- 10.00s/m). With respect to the relationship between the parameters, the graphs of IV/PV, IV/A762nm and IV/EC showed strong negative correlations, while the graphs of EC/A762nm, EC/PV and PV/A762nm showed strong positive correlations. The strongest correlation was obtained for the graph of EC/PV for PO with r = 0.989 (p < 0.05). The strong r values obtained for all the plotted graphs means that the chemical parameters used in the study are highly associated. The corresponding regression equations can be used to predict the value of one parameter when the other is known. This might be useful in routine industrial quality control.
