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RTI International RTI International is a trade name of Research Triangle Institute. www.rti.org Ion Analysis 2014 IMPROVE Steering Committee Meeting Cape.

Published byBritton Hensley Modified over 9 years ago

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Presentation on theme: "RTI International RTI International is a trade name of Research Triangle Institute. www.rti.org Ion Analysis 2014 IMPROVE Steering Committee Meeting Cape."— Presentation transcript:

1 RTI International RTI International is a trade name of Research Triangle Institute. www.rti.org Ion Analysis 2014 IMPROVE Steering Committee Meeting Cape Romain National Wildlife Refuge, SC October 15-16, 2014 Tracy Dombek Eva Hardison, David Hardison

2 RTI International Since the last meeting the RTI Ions Lab…  Received and analyzed ~21,000 nylon filters for anions.  Performed expedited analyses to support UC-Davis in the investigation of the substantially low 3S/SO 4 = ratios at the BYIS1 site.  Evaluating two new ion chromatographs for potential increased efficiency in the RTI Ions Lab.  Participated in the experimental inter-comparison of speciation laboratories conducted by NAREL in Feb/Mar 2014.  Performed research evaluating trends on 3S/SO 4 -2 ratios in CSN data from 2003 through 2014.

3 RTI International Nylon Filters Received 10/7/13 – 10/3/14

4 RTI International Ion Data Reporting  RTI currently reports ion loadings, in µg, to UC-Davis by quarter (Excel.xlsx file; ).  Ion data for the A14 Quarter (Mar, Apr, May 2014) were reported on 9/3/14.  Going forward, RTI will report according to a schedule agreed upon with UC-Davis

5 RTI International Evaluation of Metrohm IC system

6 RTI International Evaluation of Thermo Cap IC system

7 RTI International NAREL Experimental Inter-comparison of Speciation Laboratories - Study #9

8 RTI International NAREL Experimental Inter-comparison of Speciation Laboratories - Study #9

9 RTI International NAREL Experimental Inter-comparison of Speciation Laboratories - Study #9

10 RTI International NAREL Experimental Inter-comparison of Speciation Laboratories - Study #9

11 RTI International Chemical Speciation Network: Sulfur/Sulfate ratio Evaluation  Ratios are highly correlated.  Higher ratios were observed in the summer months.

12 RTI International Summer Distribution of Median Ratios - July

13 RTI International Winter Distribution of Median Ratios- December

14 RTI International  115 samples where 80% or less of the sulfur was attributed to sulfate were reanalyzed with and without an oxidation step.  These results shows that only samples from Alaska during the winter months showed some recoverable sulfate, likely due to wood and oil burning for heating.

15 RTI International Thanks to RTI/ECD Staff

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