Transporters belonging to the NIP subfamily of aquaporins in rice are permeable to arsenite but not to arsenate. 亞砷酸鹽是稻田土壤中砷的主要存在形式，而木質部把營養從根部運輸到植株。
The arsenate is usually formed in oxidation zones in contact with the atmosphere and free oxygen, and arsenic will precipitate with ferric hydroxide. 在與大氣和游離氧接觸的氧化帶中，常形成砷酸鹽，而且砷與氫氧化鐵一起沉淀。