Hello, I would like to ask what ions are in bleached kraft softwood pulp? The ions of bleached kraft softwood pulp include sulfate ion, barium ion, hydroxide ion and hydrogen ion. Bleached kraft softwood pulp is made from softwood by kraft cooking and bleaching. There is barium sulfate solution in kraft cooking, which contains sulfate ion, barium ion, hydroxide ion and hydrogen ion, so bleached kraft softwood pulp contains sulfate ion, barium ion, hydroxide ion and hydrogen ion.