Californian Office of Environmental Health Hazard Assessment increases the No Significant Risk Level for chlorothalonil to 41 micrograms per day
The OEHHA previously published a proposed NSRL of 27 micrograms per day in March 2011, but has now amended this to 41 micrograms per day. The OEHHA states the change has been made following a more current calculation to convert estimates of animal cancer potency to estimates of human cancer potency.
Written comments on the proposed amendment should be received by 20 January 2012.
Chlorothalonil
Chlorothalonil is commercially available in many different formulations and delivery methods. It is applied as a dust, dry or water-soluble grains, a wettable powder, a liquid spray, a fog, and a dip. According to the United States Environmental Protection Agency, chlorothalonil is a Toxicity Category I eye irritant, producing severe eye irritation. It is in Toxicity Category II, "moderately toxic," if inhaled (inhaled LD50 0.094 mg/L in rats.) For skin contact and ingestion, chlorothalonil is rated Toxicity Category IV, "practically non-toxic," meaning the oral and dermal LD50 is greater than 10,000 mg/kg.
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This news item was sourced with the help of Chemical Watch.