With regard to the regeneration of chitosan, it was found that sodium hydroxide is a
good agent for zinc and arsenic desorption, whereas ammonium sulphate and sodium
chloride were the most suitable for copper and mercury desorption, respectively. The
ability of chitosan to remove arsenic from natural water, and copper and zinc from
mining waste water was verified. The use of these results for designing purposes is a
subject for future work.