Distribution of 2,4-D in Air and on Surfaces inside Residences after Lawn Applications

 

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Subject:   Distribution of 2,4-D in Air and on Surfaces inside Residences after Lawn Applications....
 Date:      Fri, 30 Nov 2001 15:17:23 -0500
From:        Stephen Tvedten <steve@getipm.com>
Organization:     Get Set Inc. (www.getipm.com)

To:     Paul Helliker <phelliker@cdpr.ca.gov>
          Director, State of California, Department of Pesticide Regulation 

cc:    Christine Whitman whitman.christine@epa.gov

Dear Mr. Helliker,  I thought you might like to read the following:

http://ehpnet1.niehs.nih.gov/docs/2001/109p1185-1191nishioka/abstract.html

Environmental Health Perspectives Volume 109, Number 11, November 2001 Distribution of 2,4-D in Air and on Surfaces inside Residences after Lawn Applications: Comparing Exposure Estimates from Various Media for Young Children

Abstract

We collected indoor air, surface wipes (floors, table tops, and window sills), and floor dust samples at multiple locations within 11 occupied and two unoccupied homes both before and after lawn application of the herbicide 2,4-D. We measured residues 1 week before and after application. We used collected samples to determine transport routes of 2,4-D from the lawn into the homes, its subsequent distribution between the indoor surfaces, and air concentration as a function of airborne particle size. We used residue measurements to estimate potential exposures within these homes. After lawn application, 2,4-D was detected in indoor air and on all surfaces throughout all homes. Track-in by an active dog and by the homeowner applicator were the most significant factors for intrusion. Resuspension of floor dust was the major source of 2,4-D in indoor air, with highest levels of 2,4-D found in the particle size range of 2.5-10 µm. Resuspended floor dust was also a major source of 2,4-D on tables and window sills. Estimated postapplication indoor exposure levels for young children from nondietary ingestion may be 1-10 µg/day from contact with floors, and 0.2-30 µg/day from contact with table tops. These are estimated to be about 10 times higher than the preapplication exposures. By comparison, dietary ingestion of 2,4-D is approximately 1.3 µg/day. Key words: 2,4-D, indoor air, particle size, pesticide exposure, pesticide transport, residential exposure. Environ Health Perspect 109:1185-1191 (2001). [Online 6 November 2001]

Well Mr. Helliker, Your "registered" POISONS certainly "get around", it is very obvious these "registered" toxins of yours, do not stay where you spray them.

Respectfully,  Stephen L. Tvedten

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