Our BP-OA Organic Acid columns are used for determining the anions of weak organic and inorganic acids. Anions of organic acids include acetate, formate, oxalate and others. Anions of inorganic acids include fluoride, bicarbonate, borate, silicate and others. Acids are eluted usually in order of acid strength with the stronger acids eluting last(in order of increasing pKa values). Retention times of the organic acids may be controlled through adjustment of the eluent pH.