Off-white beads with a macroporous resin structure and a general affinity for polyvalent metal cations which may be employed for special techniques (e.g. 90Sr++ determination).Styrene-DVB matrix with aminomethylphosphonic acid groups. Sodium form. The total capacity, expressed in g Cu/l is 45. Maximum working temperature: 65 °C (145 °F). Complete desorption can be effected by 5 volumes of 2N HCl.