Determination of atmospheric hydroxyl radical by HPLC coupled withelectrochemical detection
LIU Bin , WANG Hui-xiang
DOI:
Received March 05, 2007,Revised April 24, 2007, Accepted , Available online
Volume 20,2008,Pages 28-32
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The hydroxyl radical (·OH) plays a central role in the oxidation and removal of many atmospheric compounds. Measurement
of atmospheric .OH is very di cult because of its high reactivity and low atmospheric abundance. In this article, a simple and
highly sensitive method, high performance liquid chromatography coupled with coulometric detection (HPLC-CD), was developed
to determine .OH indirectly by determining its reaction products with salicylic acid (SAL), 2,3-dihydroxybenzoic acid (2,3-DHBA),
and 2,5-dihydroxybenzoic acid (2,5-DHBA). Under the optimum conditions for its determination, 2,3-DHBA and 2,5-DHBA could be
well separated and the detection limits for 2,3-DHBA were 3 10??10 mol/L and for 2,5-DHBA were 1.5 10??10 mol/L, which were
lower than most previous reports. This method was also applied to measure atmospheric hydroxyl radical levels and demonstrated the
feasibility in clean and polluted air.
