Loss of pesticides from patches used in the field as pesticide collectors

Abstract

Patches of fabrics exposed to pesticide spray formulations lost substantial quantities of the chemicals within four to six hours. Fabrics were cotton or 1:1 cotton-polyester blends, knitted or woven, unfinished or finished. Pesticides used were parathion, malathion, and dicofol. Parathion loss following exposure to spray formulations was dependent on fabric type, finish and their interaction, while a less extensive loss of dicofol depended on none of these. Deposition and retention of pesticide-bearing particulates appeared to depend on mechanical restrictions related to fabric weave and on the electrokinetic potential of fabric surfaces.

A Laboratory Comparison of Two Media for Use in the Assessment of Dermal Exposure to Pesticides

“…(6) Investigators have also employed uorescent tracers mixed with the pesticide application and imaged with UV lamps to estimate exposure to pesticides. (11) Charcoal cloth has been investigated for use in the determination of fumigants, but the media is very fragile and its capacity is signi cantly compromised at higher relative humidity levels. (11) Charcoal cloth has been investigated for use in the determination of fumigants, but the media is very fragile and its capacity is signi cantly compromised at higher relative humidity levels.…”

Pesticide Barrier Performance of Selected Nonwoven Fabrics in Laboratory Capillary and Pressure Penetration Testing

“…Field testing can be costly and time consuming, however, and the opportunity to conduct field tests may be limited to a few months of the year. Furthermore, many factors that influence pesticide penetration are difficult to control or determine in the field, including weather, worker activity, and pesticide droplet size among others [ 11 ] . This level of complexity gives field trials their value, but it also makes scientific evaluation of fabric performance very difficult.…”