From day 1 to day 7, the TPH release rate from the soil showed an increasing trend due to the effective presence of the surfactant and further release of contaminants over time.
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The release of petroleum hydrocarbons from a saline-sodic soil by the new biosurfactant-producing strain of Bacillus sp.
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The sentences
However, a further increase in the concentrations of the mentioned biosurfactant and bioemulsifier beyond CMC led to a decreasing trend in the TPH release from the soil.