PMID- 19199811
OWN - NLM
STAT- MEDLINE
DCOM- 20100810
LR  - 20131121
IS  - 1520-6882 (Electronic)
IS  - 0003-2700 (Linking)
VI  - 81
IP  - 5
DP  - 2009 Mar 1
TI  - Development of a coupled diffusion denuder system combined with gas 
      chromatography/mass spectrometry for the separation and quantification of 
      molecular iodine and the activated iodine compounds iodine monochloride and 
      hypoiodous acid in the marine atmosphere.
PG  - 1777-83
LID - 10.1021/ac801839v [doi]
AB  - This study concerns the development of a coupled diffusion denuder system capable 
      of separating and quantifying gaseous molecular iodine (I(2)) and two other 
      highly reactive iodine species, ICl and HOI, which are collectively named 
      activated iodine compounds (AIC). Both I(2) and AIC are key species in the 
      atmospheric chemistry of iodine. 1,3,5-Trimethoxybenzene (1,3,5-TMB)- and 
      alpha-cyclodextrin/(129)I(-) (alpha-CD/(129)I(-))-coated denuders proved to be 
      suitable for the collection of gaseous AIC and I(2), respectively. The 
      experimental collection efficiencies for AIC (tested as ICl) and I(2) agreed well 
      with the theoretical values for gas flow rates in the range between 300 and 1800 
      mL min(-1). The coupled denuder system (1,3,5-TMB-coated denuder as front-denuder 
      coupled upstream of an alpha-CD/(129)I(-)-coated denuder) was applied 
      successfully to separate test gas mixtures of ICl and I(2) at various mixing 
      ratios in the laboratory. The operation of both denuder systems was demonstrated 
      to be independent of relative humidity (0-100%) and storage period (at least 2 
      weeks prior to and after sampling). Detection limits were achieved at 
      sub-parts-per-trillion-by-volume (sub-pptv) level. The presented method provides 
      a reliable and practical approach for the speciation of gaseous iodine compounds. 
      In addition, we report for the first time ambient air measurements of AIC mixing 
      ratios, carried out at the atmospheric research station in Mace Head, Ireland. A 
      maximum concentration of AIC of 30.2 pptv was observed for nighttime measurements 
      and 6.0 pptv for daytime measurements. A similar diurnal pattern was found for 
      I(2) with an average concentration level of 23.2 pptv during daytime and 85.1 
      pptv during nighttime, indicating a strong correlation with AIC.
FAU - Huang, Ru-Jin
AU  - Huang RJ
AD  - Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of 
      Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
FAU - Hoffmann, Thorsten
AU  - Hoffmann T
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Anal Chem
JT  - Analytical chemistry
JID - 0370536
RN  - 0 (Air Pollutants)
RN  - 0 (Chlorides)
RN  - 0 (Gases)
RN  - 0 (Iodides)
RN  - 0 (Iodine Compounds)
RN  - 0 (alpha-Cyclodextrins)
RN  - 0SMG5NLU45 (iodine monochloride)
RN  - 2PYC923C5W (hypoiodous acid)
RN  - 9679TC07X4 (Iodine)
RN  - Z1LH97KTRM (alpha-cyclodextrin)
SB  - IM
MH  - Air Pollutants/chemistry
MH  - Atmosphere/*analysis/chemistry
MH  - Chlorides/*analysis
MH  - Diffusion
MH  - Equipment Design/methods
MH  - Gas Chromatography-Mass Spectrometry/*methods
MH  - Gases
MH  - Iodides/*analysis/chemistry
MH  - Iodine/*chemistry
MH  - Iodine Compounds/*analysis
MH  - Ireland
MH  - Limit of Detection
MH  - Particle Size
MH  - Volatilization
MH  - alpha-Cyclodextrins
EDAT- 2009/02/10 09:00
MHDA- 2010/08/11 06:00
CRDT- 2009/02/10 09:00
PHST- 2009/02/10 09:00 [entrez]
PHST- 2009/02/10 09:00 [pubmed]
PHST- 2010/08/11 06:00 [medline]
AID - 10.1021/ac801839v [pii]
AID - 10.1021/ac801839v [doi]
PST - ppublish
SO  - Anal Chem. 2009 Mar 1;81(5):1777-83. doi: 10.1021/ac801839v.