EFFECTS OF METAL-IONS AND PH ON THE STABILITY OF LINOLEIC-ACID HYDROPEROXIDE IN THE WATER PHASE

We examined linoleic acid hydroperoxide (hydroperoxyoctadecadienoic ac id; HPOD) decomposition kinetically with or without various metal ions and at various pHs as effective factors on the stability of hydropero xides, HPOD decomposition in the reaction system of this experiment wa s a first-order reaction. Manganese, copper, and especially iron accel erated the decomposition of HPOD, while lithium, sodium, potassium, ma gnesium, calcium, and aluminium stabilized HPOD. Besides, HPOD was com paratively stable at pH 3, 7, and 8, and unstable at pH 2, 4-6, and 9. According to activation energy, however, it was estimated that only i n the reaction system with iron or at pH 2 and 9 the HPOD decompositio n mechanism was different from that in water.