List of Articles Soil-washing Open Access Article Abstract Page Full-Text 1 - The assessment of efficiency of saponin as bio-surfactant in removal of nickel and vanadium from soil contaminated by petroleum, Case study: Ahwaz oil pumping unit Behnoush Khoshmanesh Rasoul Ghadami Ali Akbar Ghafourinejad 10.22034/ap.2018.538374