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首页> 外文期刊>Atmospheric environment >Investigation of the use of filter packs to measure the sulphur isotopic composition of volcanic sulphur dioxide and the sulphur and oxygen isotopic composition of volcanic sulphate aerosol
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Investigation of the use of filter packs to measure the sulphur isotopic composition of volcanic sulphur dioxide and the sulphur and oxygen isotopic composition of volcanic sulphate aerosol

机译：关于使用过滤器包测量火山二氧化硫的硫同位素组成以及火山硫酸盐气溶胶的硫和氧同位素组成的研究

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Filter packs have been used to collect sulphur and oxygen from air for isotope analysis from many areas of the world. Here we discuss their use to determine the sulphur isotope systematics of SO_2 and the sulphur and oxygen systematics of sulphate particles from volcanic vents. Our field data suggest that fractionation of sulphur isotopes occurs during the collection of SO_2 from concentrated volcanic gas plumes on alkali-impregnated filter papers. The collection of volcanogenic HCl on the same filters may play a role in this fractionation. Comparison with previous studies, which sampled areas of cleaner atmosphere, suggests that isotopic fractionation only becomes significant where elevated filter loadings occur (e.g., when sampling gas streams with SO_2 concentrations greater than ～ 1 μmol m~(-3)), although this requires further investigation. Previous studies also suggest that for volcanic sulphate particle samples collected at the same time, oxygen isotopes are fractionated while sulphur isotopes are not. Minimising the filter loading reduces these effects, but there is a trade-off with the amount of SO_2 or SO_4~(2-) required for isotopic measurements. Despite the convenience of the filter pack technique these fractionation effects limit the use of filter packs for determining δ~(34)S for SO_2 in volcanic gases and δ~(18)O and δ~(17)O for the sulphate in volcanic particles, and they will certainly not be useful for determining small variations in the source isotopic signature of the sulphur in the SO_2 or the oxygen in the SO_4~(2-) being measured. This highlights the importance of collecting SO_2 quantitatively for isotopic analysis. These effects may also have implications if using similar methods to collect SO_2 in other environments, especially where concentrations are high.
机译：滤袋已用于从空气中收集硫和氧，以用于世界许多地区的同位素分析。在这里，我们讨论了它们用于确定SO_2的硫同位素系统以及火山喷口中硫酸盐颗粒的硫和氧系统的作用。我们的现场数据表明，在碱浸滤纸上从浓缩的火山气柱中收集SO_2时，会发生硫同位素的分馏。在相同的过滤器上收集火山氯化氢可能在这种分馏中起作用。与以前的研究比较，该研究对更清洁的大气区域进行了采样，结果表明，只有在过滤器负荷升高的情况下，同位素分馏才变得有意义（例如，当采样的SO_2浓度大于〜1μmolm〜（-3）的气流时），进一步的调查。先前的研究还表明，对于同时采集的火山硫酸盐颗粒样品，氧同位素是分馏的，而硫同位素不是。使过滤器负载最小化可减少这些影响，但需要进行同位素测量所需的SO_2或SO_4〜（2-）量之间的权衡。尽管使用了过滤器组技术很方便，但这些分馏效应仍限制了使用过滤器组确定火山气体中SO_2的δ〜（34）S和确定火山岩中硫酸盐的δ〜（18）O和δ〜（17）O ，对于确定被测SO_2中的硫或SO_4〜（2-）中的氧的源同位素特征的微小变化，它们无疑将是无用的。这突出了定量收集SO_2进行同位素分析的重要性。如果在其他环境中，尤其是在高浓度环境中使用类似的方法来收集SO_2，这些影响也可能会产生影响。

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