Pesticides, liquid impregnation

Agricultural pesticides exist in a variety of forms gases, liquids, emulsions, granules, powders, pellets, aerosols, encapsulates, and even impregnated... 

The more usual way of preparing reversed phase papers is by impregnation with silicones, rubber, or liquid ion exchangers [15]. These papers, only some of which are available commercially, can be used to separate hydrophobic substances such as amines, fatty acids, sterols, triglycerides, vitamins and pesticides. 

The mixture of glycerin and PVC emulsion is completely absorbed by sponge cubes, which are further tumbled to achieve uniform distribution of liquid. ITie impregnated cubes are exposed to 100"C for 30 min and at 127"C for 40 min, which is sufficient to sinter particles of PVC. Glycerin is washed out by water in the next step and cubes are dried. Cubes have a PVC/cellulose ratio of 3.41/1 and they have a microporous structure. The cubes are used to remove toxic organic species from water such as polychlorinated biphenyls, dioxins, polyaromatie hydrocarbons, nitroaromatics, pesticides, herbieides, and volatile halocarbons. 

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