STP875

    Determination of the Liquid Holding Capacity (LHC) or Sorptivity of Agricultural Carriers

    Published: Jan 1985


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    Abstract

    Carriers of interest and test methods for determining their ability to hold various concentrations of liquid technicals while remaining free flowing enough for handling and application are described. Discussions of property parameters pertinent to feasible impregnation cycles and adequate distribution include data on the effects of particle size distribution, heat treatment, moisture content, carrier type, rate of absorption, test temperature, and sorbate properties. Testing of both powdered and granular absorbent carriers derived from naturally occurring minerals and botanical sources are detailed. Feasible plant processing operations may not only depend on “one-step” impregnations of carriers but can involve such features as multiple impregnations with solvent removal steps or drying after each impregnation, and the test should be sufficiently flexible to cover such a possibility. Of primary importance in the in-plant processing of liquid materials on carriers to make dusts or granular pesticides is the rate of absorption, which is never instantaneous but can range from very rapid (minutes) to very slow (hours). Possible procedural variations must be featured in the testing techniques to allow for this difference in absorptive rates. The bottom line on all sorptivity tests is to supply the formulator with easy-to-obtain information telling him what he can accomplish in plant processing and to show him in advance the physical characteristics of resultant final products. Thus the aim of sorptivity testing is not only to characterize absorbents, but also to avoid surprises in processing.

    Keywords:

    agricultural carriers, impregnation sorptivity, absorbents, absorption tests, pesticides, liquid holding capacity, attapulgite, montmorillonite, corncobs


    Author Information:

    Sawyer, EW
    Manager of Clay Research, and Product and Process Development Engineer, Floridin Company, Division of Penn. Glass Sand Corp.-ITT, Berkeley Springs, WV

    Purcell, RJ
    Manager of Clay Research, and Product and Process Development Engineer, Floridin Company, Division of Penn. Glass Sand Corp.-ITT, Berkeley Springs, WV


    Paper ID: STP32872S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP32872S


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