Where does “arseniato” come from?

arseniato (Spanish) comes from Spanish arsénico, from Latin arsenicum, from Ancient Greek ἀρσενικόν, from Middle Persian zarnīk, from Avestan 𐬰𐬀𐬭𐬀𐬥𐬌𐬌𐬀, from Proto-Indo-European ǵʰelh₃i.

arseniato (Spanish): arsenate