ĐÁNH GIÁ ẢNH HƯỞNG CỦA MỘT SỐ DUNG MÔI HỮU CƠ ĐẾN QUÁ TRÌNH PHÂN LY CỦA AXIT ASENIC (H3AsO4), AXIT ASENƠ (H3AsO3) Phần 2: Ảnh hưởng của dung môi axeton – nước

Tóm tắt

In this paper, we show the results of drawing constituents distributing diagram of arsenic acide (H3AsO4) and arsenous (H3AsO3) depend on pH data that have taken from titration H3AsO4 0,1M and H3AsO3 0,1M solutions by NaOH 0,1M solution in aceton - aqua solvents. The ion strenght are fixed by NaCl 0,1M solution in the same aceton - aqua solvent of each acide solution. The pH data were measured by using automatic potential titratration system with a glass electrode. The ACD/pKa DB software was used to calculate all pKi value and all the graphs that were built on these value indicated that in all solutions at pH ≤ 8 H3AsO3 not solvent, when H3AsO4 existed mainly in H2AsO4- and HAsO42-. Base on result, we chose the slovent with 30% aceton (vol/vol) in aqua to examine extracting inorganic As(III) from water containing inorganic As(V) by using anion exchange columns.