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The determination of hydroxyl radical concentrations in environmental chambers using electron spin resonance.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>1994
Issue number5
Number of pages10
Pages (from-to)999-1008
<mark>Original language</mark>English


A simple sampling and analytical method for the determination of OH radical concentrations in air is described, as applied to the characterization of air in closed environmental chambers. High-volume sampling through a filter paper impregnated with α-(4-pyridyl 1-oxide)-N-tert-butylnitrone leads to the formation of an OH-spin adduct. After extraction into toluene the adduct is analysed by electron spin resonance spectroscopy. Unambiquous identification and quantification of OH radical concentrations is achieved, giving a detection limit of 5 × 104 radicals cm−3 of air and a precision of ± 25%.