Recently, the peanut oil MQL has revealed its cooling and lubrication roles in hard turning process. In this on going research, the post supercritical-fluid-mixed solutions was evaluated in order to determine the remaining CO2 gas in relevant aqueous electrolyte. The mixtures of 30 vol.% of carbon dioxide at supercritical state with different peanut oil concentrations were first formed with a duration of 30min. then exposed to the atmosphere and the release of CO2 from these correlative mixtures were measured accordingly. As a result, the maximum released CO2 concentration was up to 7% then gradually decreased to 0.04% within an hour under the condition of 500 rpm agitation. Those maintained supercritical gaseous substance in the aqueous cutting solution promises the high penetrating potential in the minimum quantity lubrication (MQL) as the green cooling and lubricant technique.