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•Non-redox sensitive sorbents leach arsenic to an equal or greater extent than a ferric sorbent.•Fe, Ti, Zr and La sorbents leach arsenic exceeding the Toxicity Characteristic.•Arsenic solid retention increases along a decreasing reduction activity gradient.•La retained a greater fractional proportion of its initial arsenic load than other sorbents due to a higher pHpzc.
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