10.1021/acsearthspacechem.8b00082.s001
Lauren
E. McGraw
Lauren
E.
McGraw
Nina D. S. McCollom
Nina D. S.
McCollom
Charity M. Phillips-Lander
Charity M.
Phillips-Lander
Megan E. Elwood Madden
Megan E.
Elwood Madden
Measuring Perchlorate and Sulfate in Planetary Brines
Using Raman Spectroscopy
American Chemical Society
2018
water peaks
measure solutes
Quantitative solute analyses
ultrapure water
show evidence
Raman spectroscopic method
sample preparation
Raman peak height ratios
target anion
surface
geochemical conditions
OH
peak area ratios
Raman Spectroscopy Liquid water
Planetary Brines
2018-09-11 00:00:00
Dataset
https://acs.figshare.com/articles/dataset/Measuring_Perchlorate_and_Sulfate_in_Planetary_Brines_Using_Raman_Spectroscopy/7128452
Liquid water likely
exists on the surface of Mars and below the
icy crusts of Europa, Enceladus, and Titan. Pluto, Ceres, and Ganymede
also show evidence of liquid water at or near the surface. Quantitative
solute analyses would provide critical data needed to understand geochemical
conditions throughout our solar system, including potential habitability
of planetary bodies. We have developed and tested a Raman spectroscopic
method for measuring perchlorate and sulfate in brines and dilute
waters that utilizes simple Raman peak height ratios rather than peak
area ratios. Ratios of the target anion and OH- bending water peaks
yield linear fits with positive slopes and r<sup>2</sup> values >0.99.
Calibration fits for each solute–brine combination and ultrapure
water yield similar linear equations, suggesting this method can detect
and quantitatively measure solutes in complex aqueous solutions. No
sample preparation or physical contact with the sample is required.
Therefore, this method can be employed without contaminating the fluid
or the spacecraft.