MSL - SAM and CHEMIN, Discussion of the science/results from these instruments |
MSL - SAM and CHEMIN, Discussion of the science/results from these instruments |
Nov 21 2012, 11:46 AM
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
ADMIN NOTE: Hi All, a new topic for the discussion of the science from the SAM and Chemin instruments.
There has been a very important amendment to Rule 1.3 which is explained here. Please remember Rule 1.3 at all times when discussing matters in this section. |
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Dec 4 2012, 04:43 PM
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#2
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Member Group: Members Posts: 507 Joined: 10-September 08 Member No.: 4338 |
For some context, we had the following results from the Viking GCMS.
Sample T Compound Abundance (ppb) VL1 Blank Test 500 CH3Cl Not Detected Sample 1 200 CH3Cl 15 VL-2 Blank Test 500 CH2Cl2 Not Detected Sample1 500 CH2Cl2 2-6 Sample2 500 CH2Cl2 20-40 For a discussion, see this paper: http://www.agu.org/pubs/crossref/2010/2010JE003599.shtml The original Viking GCMS results were published in this Ph.D. thesis: http://dspace.mit.edu/bitstream/handle/172...69/07517313.pdf See for example, Pages 203 and 204 for VL-1 and VL-2 chlorinated hydrocarbon results. (Methyl Chloride = Chloromethane, Methylene Chloride = Dichloromethane) Also chlorinated hydrocarbon results from Antarctic soils Pp 233,242,250,258. |
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Dec 5 2012, 04:03 PM
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Member Group: Members Posts: 507 Joined: 10-September 08 Member No.: 4338 |
Also chlorinated hydrocarbon results from Antarctic soils Pp 233,242,250,258. What I find fascinating is that chloromethanes were detected by tests of the Viking GCMS in Antarctic soils. Apparently these soils do also contain perchlorate: http://pubs.acs.org/doi/abs/10.1021/es9033606 If this hint had been followed up, we might have hypothesized the presence of perchlorate in Martian soils a lot earlier. |
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Dec 5 2012, 04:59 PM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
...If this hint had been followed up, we might have hypothesized the presence of perchlorate in Martian soils a lot earlier. Well... perchlorate was one of the options that was being discussed at the time of the original GCMS experiments on Viking. The phrasing I recall is that the time-release experiment data fit well with a Martian soil rich in "super-oxidants," and one of the super-oxidants that headed the list was perchlorate. I believe the presence of chlorine in some of the evolved gasses seen in the Viking results is what led to that speculation, 36 years ago. I don't have any articles of the time in front of me, but I am very confident of my memory of the "super-oxidant" reports. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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