The filter wool traps large debris and particles, and the activated carbon adsorbs smaller impurities. Sodium ethyl xanthate easily adsorbs on the surface of solid sulfides. The negatively charged polymer backbone adsorbs on the positively charged colloidal particles. Dicofol is practically insoluble in water and adsorbs very strongly to soil particles. Carbon dioxide adsorbs in appreciable quantities onto many porous materials through van der Waals interactions. Activated carbon adsorbs toxins on the extended porous surface of the carbon. One is when arsenate is reduced to arsenite which adsorbs to iron oxides less strongly. MDP adsorbs onto the crystalline hydroxyapatite mineral of bone. Reductive dissolution does not necessarily occur at the site where the reductant adsorbs. This often happens when the eluent adsorbs onto the stationary phase, displacing the analyte. As a surfactant, 2-butoxyethanol adsorbs at the oil-water interface of the fracture. Finally, C5 is unique in that it readily adsorbs in native form to unsensitized erythrocytes. Traps are gradually poisoned by SO which adsorbs more strongly than .