Yuhui CH-IM is a premium grade macroporous iminodiacetic acid chelating resin based on styrene-divinylbenzene (DVB) copolymers with standard Gaussian particle size distribution. Due to its special iminodiacetic acid functional group, CH-IM has high selectivity to capture heavy metals such as cooper, nickel, cobalt, zinc. CH-IM is developed to be used for heavy metals removal from contaminated ground water or waste water and metals recovery in hydrometallurgy or electroplate industry. The selectivity of CH-IM should follow sequence as below.

Cu²⁺ > VO²⁺ > UO₂²⁺ > Pb^2+/4+ > > Ni²⁺ > Zn²⁺ > Cd²⁺ > Co²⁺ > Fe²⁺ > Be²⁺ > Mn²⁺ > Ca²⁺ > Mg²⁺ > Sr²⁺ > Ba²⁺ > Na⁺