The ionic exchange behavior of silver ions on sulphydryl cotton has been studied. Silver ion is adsorbed from HN03 solution and eluted very easily with HCl or HBr solution. The rate of adsorption and elution are rapid The detection limit is estimated to be 0.06 ppm (1g sample) and the relative standard deviation of very low content (0.1-0.2 ppm) of silver ions is about 20% and that of moderate low content (1-3ppm) is about 6%