Aircraft measurements of the concentration and flux of agrochemicals

Article Abstract:

An aircraft-based air sampling method devised to measure concentration and flux of agrochemicals was shown to be effective not only in determining concentration and flux, but also in mapping out the relative concentrations of the agrochemicals. The air sampling tested atrazine and metolachlor and used the relaxed eddy-accumulation technique. The flights from Ottawa to southern Ontario showed a peak concentration of 4.6 ng/cu.m. for atrazine and 9.8ng/cu. m for metolachlor.

Agricultural Chemicals, Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing, Environmental aspects, Design and construction, Air sampling apparatus, Air sampling equipment, Agricultural pollution

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Evaluation of a high-purity and high-stability continuous generation system for nitrous acid

Article Abstract:

A portable generation system for nitrous acid is described in terms of gaseous hydrogen chloride activity from a low-pressure permeation instrument and sodium nitrite in a fluidized bed. Unitary HCl removal efficiency for HCl mass flow rates are achieved for specific humidity and operational flow levels. A desired nitrous acid mass flow rate can be established through proper assignment of temperature and flow rate values.

Nitric acid

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Evidence for the heterogeneous formation of nitrous acid from peroxynitric acid in environmental chambers

Article Abstract:

The heterogeneous formation of nitrous acid from peroxynitric acid was investigated. The results indicated that HO2NO2 formed from the HO2 + NO2 reaction could also produce HONO heterogeneously. This would in turn add to the excess formation of HO radicals. This contrasts with earlier assertions that background radical sources had an initial concentration of nitrous acid.

Peroxides

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