Aerosol sampling

Lab Note #9
Jan 24, 2014

In addition to collecting snow, we are also collecting aerosols using a High Volume Aerosol Sampler (Hi Vol) pictured below.

The Hi Vol pumps air through a filter, where the aerosols are collected. The image below shows the Hi Vol with the lid open. The lid is only open when we are changing the filters.

This is what it looks like inside. In the image below, you can see the filter in the filter holder.

Below is an image of the filter stored in a ziplock bag. You can see how dirty the filters are after sample collection!

We collect aerosols for 24 hours per sample. The filters are brought back to the lab for analysis. We will be analyzing the concentration of anions (nitrate, sulfate, etc) and eventually the isotopic composition of nitrate. The latter tells us the relative importance of human emissions of nitrogen oxides (NOx) compared to that emitted (recycled) by chemical reactions in the snow.

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