Samples of heated virgin olive oils collected from a fryer every two hours up to 94 h were analyzed to study their excitation emission matrix (EEM) and the evolution of the fluorescent composition during the thermoxidation process.
V the volume of essential oils collected (ml).
In contrast, alkylphenols, represented here by p-cresol, are severely depleted in all the oils collected, and the total C0 C3 alkylphenols concentrations in the eluted oils reach only 10% of initial oil concentrations by the end of the experiment.
Based on results from preliminary testing, 1 200 to 1 1,600 dilutions were used for essential oils collected at 78°C (Fractions I-III), and a wider range of dilutions (1 600 1 2,700) was used for Fraction IV essential oil.
For example, when essential oils collected from 0 2 h (Fraction I), 8 10 h (Fraction II), and 11 12 h (Fraction III) at 78°C were compared, longer distillation produced higher percentages of sesquiterpenes, between alpha-copaene and caryophyllene oxide (Table 1).
All around them, thousands of workers are doing the same – digging for oil, drilling for oil, collecting the oil, and selling it off to local refineries – in unregulated, artisanal pits which they claim can fetch up to 300 barrels of crude oil a day, worth $3,000 £2,0000) at local market prices.
"The pollution will harm our business for a long time," a fisherman grumbles as he loads up jars of oil collected from the beach onto his boat to be taken to the collection point for recycling.
Oil collects behind the plugs and the bacteria thrive, setting up conditions for acne.
For every 10,000 gallons of cooking oil collected, the county could save about $25,000 in diesel fuel costs, Mr. Spano said.
