Table 6 Solution pH at different biosurfactant concentrations (0.006, 0.015, and 0.024 g/mL) at 25 °C on day 5.

From: Eco-friendly removal of strontium from produced water of an oilfield in western Iran using biosurfactant derived from Malva sylvestris leaves

Concentration (g/mL)

Final pH

pH reduction

0.024

6.31

0.19

0.015

6.4

0.1

0.006

6.46

0.04

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