Advisory Committee on Pesticides Annual Report 2001

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Section F: Other items considered during the year have been granted in a northern Member State, to ensure that the supporting field data were generated under similar climatic conditions to those prevailing in the United Kingdom. The conditions proposed broadly replicated the specified conditions of the existing scheme to recognise approvals for minor uses of products approved under the Control of Pesticides Regulations. The ACP agreed to advise Ministers to accept the proposed mutual recognition scheme for extension of use for plant protection products and to agree to its publication. Operator exposure in applying amenity herbicides by All-Terrain Vehicle (ATV) and Controlled Droplet Applicator (CDA) There are no published exposure data for amenity application of herbicides using spray booms front-mounted on ATVs or a separate lance and CDA. To inform risk assessments, HSE had commissioned research to enable the assessment of exposure during use of these methods of herbicide application. The <strong>Committee</strong> considered a report on the outcome of the research. This presented the results for the two types of application, by ATV with frontmounted spray bars, and CDA sprayer. The <strong>Committee</strong> noted the findings of the research and agreed that the following indicative values should inform exposure predictions and risk assessments for these types of application: 79 ATV: The potential dermal exposure to spray fluid (21 data points) ranged between 11 and 113 mg fluid per minute, median 32.7 mg/min, based on patch samplers. These data also indicated a median penetration of work wear at 11 percent. Exposure of hands as collected on cotton gloves (21 data points) ranged between 9.18 and 227 mg spray fluid per minute, median 49.9 mg/min. Exposure by inhalation to spray fluid was found in 85 percent of samples, range 6.51 to 36.5 mg/m 3 , median of non-zero values 15.5 mg/m 3 . CDA: The potential dermal exposure to spray fluid (12 data points) ranged between 0.05 and 13.8 mg fluid per minute, median 2.21 mg/min, based on patch samplers. There were no meaningful data for clothing penetration from this study. Exposure of hands as collected on cotton gloves inside protective gloves (12 data points) ranged between 0.003 and 0.98 mg spray fluid per minute, median 0.06 mg/min, and on socks (12 data points) ranged between 0.001 and 0.76 mg spray fluid per minute, median 0.02 mg/min. Exposure by
<strong>Advisory</strong> <strong>Committee</strong> on Pesticides Annual Report 2001 inhalation was low, occurring in just 33 percent of samples, range 0.02 to 0.61 mg/m 3 , median of non-zero values, 0.12 mg/m 3 . Papers to address re-entry time policy for certain wood preservatives When a liquid wood preservative product is used indoors by a professional operator, there is a specified exclusion period in which unprotected persons and animals should be kept away from the treated area. The time at which this exclusion finishes is known as the ‘re-entry time’. Previously, there were two label phrases regarding re-entry time. These stipulated either a 48-hour or an eight-hour re-entry time, depending upon the product. 80 A 48-hour re-entry time was required unless data demonstrated that the exposure of people re-entering treated areas after eight hours was acceptable. The <strong>Committee</strong> considered a review of the existing re-entry time policy, and the criteria used to identify appropriate re-entry times and reconsidered whether shorter exclusion periods might be acceptable for certain liquid wood preservatives. It compared the airborne concentrations over time of the active substances, with appropriate NOAELs, and of any solvents in the product formulation, with the occupational exposure standards (OES) or equivalent. The <strong>Committee</strong> agreed that the exposure of people to both the solvents and the active substances was consistently and acceptably low for a range of representative products. The <strong>Committee</strong> recognised that, historically, many products had contained volatile active substances and high concentrations of solvents, and evaporation of surface residues had been significant. However, the products used in these areas had, over a number of years, been reformulated as water-based products containing involatile active substances and low concentrations of solvents. As a consequence of this, the <strong>Committee</strong> agreed that there was no clear relationship between aerial concentrations of the solvent or active substance and surface wetness of treated timber. Therefore, it agreed that exclusion from the application area should be considered solely on the basis of the possibility of exposure to air concentrations, with a physical barrier to prevent access to the treated timber until it was dry. The <strong>Committee</strong> considered that it should be possible to allow certain liquid wood preservative products a one-hour re-entry time. However, for this, the applicant would need to demonstrate convincingly that the aerial concentrations of the active substance and solvent, for its individual products, were appropriately low within one hour of application at low levels of
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Advisory Committee on Pesticides Annual Report 2001

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