The weight method: a new screening method for estimating pesticide deposition from knapsack sprayers in developing...

Area of Science:

• Environmental Science
• Occupational Health
• Agrochemistry

Background:

• Agrochemical use poses occupational and environmental risks, necessitating monitoring of pesticide contamination.
• Developing countries face challenges in monitoring pesticide residues due to limited resources and high analytical costs.
• Existing methods are often inaccessible or too expensive for widespread use in resource-limited settings.

Purpose of the Study:

• To present a new, simple, and low-cost method for estimating pesticide deposition in humans and soil.
• To provide a rapid screening tool to assess occupational and environmental exposure from agrochemical applications.
• To address the need for accessible monitoring methods in developing countries lacking analytical instrumentation.

Main Methods:

• The study introduces the 'weight method,' which estimates pesticide deposition based on water mass balance.
• High absorbent papers are used under controlled low evaporative conditions and unsaturated atmospheres.
• The method was validated by measuring drift deposition on fields and applicators' clothing using a tracer.

Main Results:

• The 'weight method' was tested in a potato production area in Colombia using knapsack sprayers.
• Results were confirmed by experimental data using a tracer, demonstrating the method's reliability.
• The weight method successfully explained 86% of the airborne drift and deposition variance.

Conclusions:

• The 'weight method' is a suitable, rapid, and low-cost screening tool for estimating pesticide deposition.
• It serves as a valuable complement to toxicological tests, especially where analytical instruments are scarce.
• This method can significantly aid in assessing occupational and environmental exposure risks associated with agrochemical use.