Elliot Chang Princeton University Class of 2016 Civil and Environmental Engineering SmithNewton Research Scholar Measuring Techniques Wellestablished Technology IRMS Isotope Ratio Mass Spectrometry ID: 554768
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The Use of Alginate and Chitosan to Purify Tree Distillates of Organic Contaminants
Elliot ChangPrinceton UniversityClass of 2016Civil and Environmental Engineering Smith-Newton Research ScholarSlide2
Measuring Techniques
Well-established TechnologyIRMS: Isotope Ratio Mass SpectrometryChromium Reduction D/H readings.CO2 bubbling 18
O/16O readings.-----------------------------------------------------------------------------------
New Technology
IRIS: Isotope Ratio Infrared Spectroscopy
Picarro
Inc.’s Cavity Ring Down Spectroscopy.
MCM: Micro-Combustion Module.Slide3
The Problem
Assumption of ‘true’ value for tree water:“The true isotope ratio of extracted plant and soil water was represented by samples cleaned using activated charcoal and measured by IRMS.” (West and Dawson, 2010).This assumption basis of several decades’ worth of environmental studies.This assumption is false.Slide4
My Proposed Solution: Pre-treatment
In addition to post-processing softwares, such as Picarro’s ChemCorrect:Eliminate alcohol contamination through the use of different adsorbent (activated carbon is NOT effective):USE ALGINATE BIOSORBENT TO REDUCE CONTAMINATION.Slide5
Results: d18OSlide6
Results: dDSlide7
Conclusions
Alginate looks to be a promising pre-treatment process.Beats the standard of using Activated Carbon.Statistical significance: Alginate makes a difference.Alginate in combination with IRISmore
accurate than IRMS.Important note: Precision dictated by application.Slide8
Questions & Comments?
Thank you.