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The authors would like to thank Andy Doklovic, Adam Clark, Barry Nudd, Brian Phouthavong, and Eve Painter for their technical and laboratory work support, and Adam J. Barlow from John Deere Des Moines Works for providing ASP (R) 602. The authors express their appreciation to the Association of Equipment Manufacturers for their support for this project. This research was supported by USDA-ARS in-house project 5082-21620-001-00D.

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EVALUATING KAOLIN CLAY AS A POTENTIAL SUBSTANCE FOR ISO SPRAYER CLEANING SYSTEM TESTS

Publicated to:Applied Engineering In Agriculture. 39 (3): 347-358 - 2023-01-01 39(3), DOI: 10.13031/aea.15466347

Authors: Roman, Carla; Jeon, Hongyoung; Zhu, Heping; Ozkan, Erdal

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Abstract

ASP (R) 602 (kaolin clay) was evaluated as an alternate material for performing ISO 22368-1 sprayer clean out test standard. Recommendations for sample homogenization, measurement temperature and sample sizes to address poten-tial concerns or technical challenges in assaying ASP (R) 602 samples were provided under relevant conditions. Linear re-gression models for predicting ASP (R) 602 concentrations from 0 to 100 ppm (mg.L-1) in sample mixtures were developed using outputs from a spectrophotometer and two different turbidimeters. Test results showed that the three instruments could measure ASP (R) 602 concentrations as low as 2 ppm. Validations of the developed models showed approximation errors were 0.9% to 24.6% and 0.1% to 18.4% for the spectrophotometer and the turbidimeters, respectively. However, their maximum absolute errors were less than 3.7 ppm for the spectrophotometer and 2.3 ppm for the turbidimeters within the validation range. Two agitation and cleaning systems of a sprayer were evaluated with ASP (R) 602 following the ISO 22368-1 clean out procedure. Residue reduction factors from the initial mixture concentration were 163 for one system which did not meet ISO 16119-2 environmental requirement (factor over 400) and 819 for the other system which exceeded the requirement. Analysis results of ASP (R) 602 samples from ISO 22368-1 clean out tests showed that ASP (R) 602 could be used as a potential testing substance to evaluate and differentiate the performance of agitation and cleaning systems of sprayers.

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