Snow wrote:Well it looks quite interesting to me, I'd like to see such data, and would answer some of the questions brought up in this thread. Some things to think about:
for the wind data I'd want to know the local wind velocity, how and how long the sample was collected, and the height above the ground (idealy a few heights). I've never sampled airborn dust, I'm not sure what sampling equipment this would take.
Care must be taken not to contaminate samples with windblown dust.
Sample multiple locations and samples for each type at each location.
I'd like to see a gradation curve below the standard geotech 200 sieve (assuming you have such sieves avail. to you)
Will you be testing for raver sweat or hippie tears in any of the samples?
Well, I was already planning for multiple sample sites (located by GPS and marked on each little baggy with standard sampling sharpie) all around the playa, probably 50 sites for air (I doubt they would all make it back with me, thus the high number), 10 sites X surface, near surface, deep, so 80 max samples.
I hadn't considered multiple heights for wind blown dust. I assumed I could just find camps all around the city and ask to stick a 10' wooden pole with an opened zip-lock bag someplace in the camp. Each pole would have a ziplock bag on the end that's forced to stay open. I would just collect the bag at the end of the week. My only real concern would be with having the wind blown samples either grossly contaminated by people messing with them, or having them not make it back to me for some reason.
What would the geologic significance be for raver sweat and hippy tears. Good idea anyway!!
I'm not sure what sized sieves are on hand but I'm pretty confident I could get my hands on what I need with a little begging to the rock sampling gods.
And with regard to contamination... yes. I would plan to use zillions of ziplock bags each labeled with their location. I am pretty confident that the samples I collect won't be contaminated but I would want as many air samples as possible since I'm relying on 1) plenty of dust, 2) people not messing with them all week, 3) getting enough dust to be useful, 4) I could use that to create two curves, one of samples people dicked with and one with real samples.