2.4. Preparation of dust extracts
All dust and materials contained in each cellulose thimble were
removed and weighed. The particulates were then sieved, first to
1500 μm, and then to 150 μm for analysis. The dust samples were
extracted using a method similar to that described in Starr et al. (2008).
Briefly, dust samples were each weighed to 0.5 g aliquots, spiked with