Please browse literature on Geobotany where you will find literature on specific plants that absorb arsenic although there are species for all the elements. Plants accumulate unexpectedly high concentration despite not being involved in any physiological functions of them. Geobotanical explorations are still very popular in a few countries including the erstwhile Russia - it is indeed pretty economical compared to other modes of mineral exploration.
Bioremediation/ Phytoremediation/Phytobial remediation involving microbes and plants both can be employed for reclaiming arsenic. There is a lot of literature available on this aspect.
I would suggest Phytoextraction but the most suitable technique would depend on a lot of site factors. You can refer to US EPA Technology Screening Matrix. That's a great tool to help you pin down the right remedial technology.