Summary
A system was developed which allowed the determination of four different atmospheric iodine species by preparing glass microfibre filters, which were arranged in consecutive order, in a specific way. Particulate iodine was collected by a particle filter, HI and I2 by a NaOH impregnated filter, HOI was adsorbed on a TBAH impregnated filter and organoiodine was adsorbed on a filter loaded with activated charcoal. These behaviours were checked by extensive model experiments. Two or more filters of the same type were used in series to show the degree of collection of one iodine species. Two European samples, one of continental and one of marine origin, and two Antarctic samples were analysed by this filter system using isotope dilution mass spectrometry (IDMS) for quantification. The distribution pattern for the different iodine species is similar for the two European samples. Organoiodine is found to be the most abundant species whereas in Antarctica the HI/I2 fraction is up to nearly 50% of the total iodine. The particulate iodine fraction is higher in Europe than in Antarctica, which is due to the low particle concentration in the remote area of Antarctica. The higher HI/I2 and HOI fractions found at the North Sea compared with the continental sample indicate that the ocean is a primary source of these species. Concentrations in the range of (0.3–3.1) ng I/m3 were analysed for particulate iodine, (0.4–1.3) ng I/m3 for HI/I2, (0.2–1.8) ng I/m3 for HOI and (0.4–7.6) ng I/m3 for organoiodine. The detection limits varied with the variances of the blank values of the different filters and lay between 0.02 ng I/m3 and 0.24 ng I/m3 using sample volumes of 70 m3 air.
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Gäbler, HE., Heumann, K.G. Determination of atmospheric iodine species using a system of specifically prepared filters and IDMS. Fresenius J Anal Chem 345, 53–59 (1993). https://doi.org/10.1007/BF00323326
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DOI: https://doi.org/10.1007/BF00323326