Ambient air concentrations of pesticides in California

Article Abstract:

Twenty-two pesticides were monitored in different parts of California to assess general population exposure. Additional sampling was also performed adjacent to agricultural use to assess maximum short-term concentrations to which the public may be exposed. The ambient air monitoring was conducted by the California Air Resources Board under the state's Dept. of Pesticide Regulation toxic air contaminant program. Results for three soil fumigants sparked the suspension of permits for the use of one and were used in developing use modifications and buffer zones for the other two.

Administration of Air and Water Resource and Solid Waste Management Programs, State Pesticide Regulaion, Laws, regulations and rules, California, Environmental policy, Pesticides, Pesticides regulation, California. Air Resources Board

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Quantification of ambient nitrodibenzopyranones: further evidence for atmospheric mutagen formation

Article Abstract:

The contribution of nitrodibenzopyranones to ambient mutagenicity is discussed. 2-and 4-nitrodibenzopyranones found in collected particle- and gas-phase samples were subjected to quantitative analyses. An environmental chamber was used to study the formation of the same compounds from the gas- phase OH radical-initiated reaction of phenanthrene. Ambient air observations were compared with environmental chamber data. Results indicate that these isomers are formed in the atmosphere.

Mutagenicity testing, Mutagenicity tests, Atmosphere

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Fundamental study of an ambient temperature ferrite process in the treatment of acid mine drainage

Article Abstract:

Ferrites are heavy metals that have been suggested as a solution to the problem of acid mine drainage (AMD) in the mining industry owing to its ferromagnetic behavior. Although effective in solving AMD, miners face the problem of forming ferrite at ambient temperatures. A study investigating the relationship between an ambient temperature ferrite process and AMD identified the molar ratio of Fe3+ to Fe2+ as the critical parameter of ferrite formation.

Research, Mining industry, Acid mine drainage, Ferrites (Magnetic materials)

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