Pesticide water dispersible granule

Pesticide Dispersants. Modified ligaosulfates are used ia the formulatioa of pesticides, la wettable powders, suspeasioa coaceatrates, and water dispersible granules, they act as dispersants and prevent sedimentation. They also act as biaders ia the productioa of granular pesticides. Typical usage levels ia these types of products range from 2—10%. 

The main purpose of pesticide formulation is to manufacture a product that has optimum biological efficiency, is convenient to use, and minimizes environmental impacts. The active ingredients are mixed with solvents, adjuvants (boosters), and fillers as necessary to achieve the desired formulation. The types of formulations include wettable powders, soluble concentrates, emulsion concentrates, oil-in-water emulsions, suspension concentrates, suspoemulsions, water-dispersible granules, dry granules, and controlled release, in which the active ingredient is released into the environment from a polymeric carrier, binder, absorbent, or encapsulant at a slow and effective rate. The formulation steps may generate air emissions, liquid effluents, and solid wastes. 

Formulation is the form in which the pesticide is delivered to the pest. Some types of triazine formulations are flow-able formulation (FF), emulsifiable concentrate (EC), and water-dispersible granule (WDG). 

Hovde, D. A. "Laboratory Development and Evaluation of Water Dispersible Granules" Pesticide Formulation and Application Systems, 3rd Conference STP 828, American Society of Testing and Materials Philadelphia PA. December, 1983. 

Utz, C.G., J.M. Sekmistrz, R.P. Hollis, Effects of nonionic surfactants on properties of water dispersible granule formulations, in RR. Hall, RD. Berger, and H.M. Collins (eds.). Pesticide Formulations and Application Systems, STP 1234 ASTM, American Society for Testing and Materials, Philadelphia, PA, 1995, pp. 190-200. 

If the pesticide constituent is a solid that is not soluble in oil or water, dien either a suspension concentrate (SC) or a water dispersible granule (WG, WDG) can be evaluated. A suspension concentrate is a dispersion of active ingredient in a continuous aqueous phase. The concentrated suspension is then diluted in the spray tank prior to application. If the solid has to be dispersed in an oil phase, then the oil flowable (OD) has to spontaneously enuilsify if it is to be diluted into an aqueous spray tank. 

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