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Round Robin Evaluation Of Astm Standard Test Method E2798 For Spray Drift Reduction Adjuvants
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Book Synopsis Round-Robin Evaluation of ASTM Standard Test Method E2798 for Spray Drift Reduction Adjuvants by : Curtis M. Elsik
Download or read book Round-Robin Evaluation of ASTM Standard Test Method E2798 for Spray Drift Reduction Adjuvants written by Curtis M. Elsik and published by . This book was released on 2011 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drift Reduction Agent has been defined in ASTM Standard E1519 Terminology Relating to Agricultural Tank Mix Adjuvants as "a material used in liquid spray mixtures to reduce spray drift." ASTM Standard E609 Terminology Relating to Pesticides defines drift as "the physical movement of an agrochemical through the air at the time of application or soon thereafter to any non- or off-target site. Drift shall not include movement to non- or off-target sites caused by erosion, migration, volatility or wind blown soil particles that occur after application unless specifically advertised on the label." Because there are many commercial tank mix adjuvants designed to reduce spray drift, there is a need to establish an ASTM Standard Test Method to evaluate their effectiveness. ASTM Standard E2798 is the new test method developed for the Characterization of Performance of Pesticide Spray Drift Reduction Adjuvants for Ground Application. This paper presents the data generated from the round-robin testing of this method. The method provides guidelines for the measurement of parameters pertaining to the performance of drift reduction adjuvants under simulated field application conditions. The measurements can be made in a wind tunnel or a spray chamber. The method describes the preparation, composition, and test/application conditions for droplet size, spray pattern measurements, and fines reduction. The exact selection of application conditions such as nozzle type and tank mix partner may vary according to the intended use conditions.
Book Synopsis Novel Lipophilic Surfactant Adjuvants for Spray-Drift Reduction by : Tammy M. Schweiner
Download or read book Novel Lipophilic Surfactant Adjuvants for Spray-Drift Reduction written by Tammy M. Schweiner and published by . This book was released on 2013 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are several types of drift-reduction technology (DRT) adjuvants commercially available. Natural and synthetic water-soluble polymers function by increasing extensional or shear viscosity. These polymers do a very good job reducing fines, but they can significantly increase volume median diameter (VMD) and broaden the particle-size distribution (PSD). Oil-based products produce emulsions that function to keep small spray drops from forming during the atomization process. A novel DRT adjuvant chemistry has been discovered that reduces fines without increasing VMD or broadening PSD significantly. This novel chemistry is lipophilic surfactants. These surfactants were tank mixed with a glyphosate dilution and their spray PSD was measured using a Sympatec HELOS/KF laser diffraction particle-size analyzer. The experimental procedure followed ASTM Standard Test Method E2798-11 ["Characterization of Performance of Spray Drift Reduction Adjuvants for Ground Application," Annual Book of ASTM Standards, Volume 11.05, ASTM International, West Conshohocken, PA, 2011]. The standard uses measurements of particle-size distribution generated when the spray-tank mixture includes the pesticide formulation. The lipophilic surfactant used in this study was an alcohol alkoxylate. This surfactant significantly reduced fines by 40 % to 50 %, and it narrowed the particle-size distribution.
Book Synopsis Spray Drift Reduction Technology Adjuvant Evaluation by : Curtis M. Elsik
Download or read book Spray Drift Reduction Technology Adjuvant Evaluation written by Curtis M. Elsik and published by . This book was released on 2010 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twelve commercial drift reduction agents were evaluated for their characteristics in the three most commonly accepted parameters for spray droplet size formation--extensional viscosity, dynamic surface tension, and kinematic viscosity. Samples were sprayed in both water and in the presence of a commercial herbicide formulation. The spray droplet spectra for these agents were then determined under rigorous control, in still-air conditions, using a Sympatec HELOS/KF laser diffraction particle size analyzer. Spraying an actual pesticide formulation that contains a wetting agent is important because the surfactant present reduces dynamic surface tension and can significantly reduce spray droplet diameter. The aerosol particle size distributions were measured using an electronic actuator that moved the nozzle spray pattern through the laser in a reproducible manner. There are multiple mechanisms that can influence both volume mean diameter and percent fines below 105 microns. There are natural and synthetic water-soluble polymers that function by increasing extensional viscosity. There are oil products that produce emulsions that keep small spray drops from forming. The droplet spectra for the different commercial products were grouped according to their specific drift reduction mechanism in order to see if a better correlation could be made on how they individually affected the resulting droplet particle size distribution.
Download or read book Liquid Atomization written by L.P. Bayvel and published by Routledge. This book was released on 2019-01-22 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the basics of liquid atomization, this book familiarizes readers with the physical processes of liquid atomization, the main types of atomizers and their design, measurements of spray characteristics, experimental investigations of atomizers, and application of atomizers. It demonstrates how to calculate and design atomizers and how to mea
