The Role and Mechanism of PAM in Phytoremediation of Heavy Metal Polluted Soil: A Review

doi:10.11924/j.issn.1000-6850.casb17050116

Abstract

Abstract: As a kind of high-molecular polymer with fine performance, polyacrylamide (PAM) is widely applied to soil and water conservation and soil reclamation in agriculture in recent years. The potential of its application in phytoremediation of heavy metals polluted soils was analyzed based on summarizing the roles and mechanisms of PAM to heavy metals in soil via the literature research: (1) PAM and its modified products could absorb specific metal ions and alleviate the toxicity of heavy metals to plants, but its efficiency is affected by pH, temperature, etc. (2) PAM could improve physicochemical properties of soils and reduce the bioavailability of heavy metals through adsorption, chelation and complexation, so that improve the growing conditions of phytoremediation plants. Although acrylamide (AMD) as one of the degradation product of PAM exhibits neurotoxic effect, it could avoid the negative influence from the PAM degradation by adjusting the application way and adding degradation microorganism to maintain the health risk in a safe range. Thus, PAM is an environment-friendly accelerant for phytoremediation of heavy metal contaminated soils and its environmental risk could be controlled.

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References

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