Influence of amendments on soil arsenic fractionation and phytoavailability by Pteris vittata L.

► Addition of PR, SPA, EDTA or compost to soils significantly increased NaHCO3-extractable As. ► Using PR or SPA could significantly increase As accumulation by Pteris vittata L. ► Adding PR and SPA in soil could increased the activities of urease and neutral phosphatase. ► Both PR and SPA were effective additives for improving phytoremediation efficiency of P. vittata.