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A sedimentation method for the determination of the effective particle size distribution of DDT dispersible powders

W. D. E. Thomas

Open publisher page 6 citations

Abstract

Abstract A modified Andreasen sedimentation method is described for the analysis of the DDT and carrier constituents of DDT dispersible powders. As an illustration of the use of the method, a 1% (w/v) aqueous suspension of the powder is sampled with a pipette at four different times from the commencement of settling. Variation of concentration of dispersible powder in the suspension within the range 0.2–2.0% (w/v) is without effect on the results. The method is shown to be suitable for use at any temperature (±0.05°) within the range 10–30°.

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What this paper is about

Abstract A modified Andreasen sedimentation method is described for the analysis of the DDT and carrier constituents of DDT dispersible powders. As an illustration of the use of the method, a 1% (w/v) aqueous suspension of the powder is sampled with a pipette at four different times from the commencement of settling. Variation of concentration of dispersible powder in the suspension within the range 0.2–2.0% (w/v) is without effect on the results. The method is shown to be suitable for use at any temperature (±0.05°) within the range 10–30°.

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Available abstract

Abstract A modified Andreasen sedimentation method is described for the analysis of the DDT and carrier constituents of DDT dispersible powders. As an illustration of the use of the method, a 1% (w/v) aqueous suspension of the powder is sampled with a pipette at four different times from the commencement of settling. Variation of concentration of dispersible powder in the suspension within the range 0.2–2.0% (w/v) is without effect on the results. The method is shown to be suitable for use at any temperature (±0.05°) within the range 10–30°.

Key concepts: Sedimentation, Settling, Suspension (topology), Aqueous suspension, Pipette, Particle size, Particle-size distribution, Materials science

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