1. Rosalina Gonzalez rosalina@udel.edu June 28, 2011 University of Delaware Welcome to Colombian Deans

2. Information Rosalina Gonzalez ● Faculty Member at La Salle University since 2003 Environmental Engineering Program. Researcher of Wastewater and Groundwater treatment of “Special Pollutants” ● Criminal Laboratory Investigator and Trainer at National Police of Colombia since 1994 ● Professor of seminars of different universities in Colombia 2

3. University of Delaware and Future Plans ● Summer Exchange Program 2008. Sorption Model of Cu and Ni in soils utilizando WHAM VI (Windermere Humic Aqueous Model WHAM VI) ● Doctoral Program 2009 – 2012 ● Senator of Civil & Environmental Engineering Program 2010-2011 ● Malcolm Pirnie, Inc. Outstanding Environmental Engineering Graduate Student Award. 2011 ● Thesis: Improving Understanding of the Fate and Transport of Munitions Constituents to Enhance Sustainability of Operational Ranges ● Comparative Study between Environmental Engineers of La Salle University and University of Delaware Undergrads ● Create a strong bridge to increase the mobility (Professors and Students) between La Salle University and University of Delaware ● Return to Colombia as soon as possible 3

4. Impact as a Professor 1. Access International Publications and contacts 2. Increase the role as Manager of Researcher 3. Break points into my way to teach  Reading Papers  “Freedom with compromise to students”  Try to improve the access to different resources  Improve the Colombian potential to assume everything in a dangerous situation, to increase the effectiveness 4. Different way to assume the research  Create the feeling of “Freedom” (responsibility) – Excessive controls.  Publications  Modeling 4

5. 5 Project More than 15 million acres containing elevated levels of explosives in the USA The estimated costs of remediation $8 billion to $141 billion (U.S. General Accounting Office, 2003). Need for developing effective technologies for predicting the fate and transport of MC Source: U.S. Army

6. Predict adsorption/desorption of MC to soils: RDX HMX TNT NG NQ 2,4 DNT 6 Technical Objective

7. 7 Soil solids Adsorption/Desorption Procedure Add Acetonitrile ACN centrifuge Soil (5 g) Add Saturation Volume 0.01M CaCl2 + 0.01 M NaN3 - 5 Days 1:1 soil:water Add 5 mL 6 conc. RDX, HMX, TNT, 2,4 DNT, NG, NQ Shaking 48 hr Adsorption (0 -5 mg/L) Filter. HPLC analysis. Adsorption – Solution Concentration Add fresh solution 0.01M CaCl2 + 0.01M NaN3 1:1 ratio (4 Times) Filter. HPLC analysis. Desorption – Solution Concentration Filter. HPLC analysis. Extraction Soil solids centrifuge

8. 8 After adsorption, samples are then desorbed sequentially in four steps: (D1  D2  D3  D4). Consecutive desorption allows extrapolation to infinite number of desorptions. This corresponds to the y- intercept, or the component of adsorption resistant to desorption. RDX, is fully reversible in Matapeake soil, while NG has a significant resistant component. Adsorption + 4 Desorptions 8

9. 9 Long-Term Desorption: Matapeake Soil

10. 10 q o Even when there’s nothing in solution Resistant component concentration, q 0 qxqx qxqx qxqx Reversible/Resistant Model

11. Resistance to Desorption of 4 MC in 3 Soils ● Soil OM: Utah - very low; Matapeake – average; Rhydtalog – very high; ● No relationship of extent of resistance with OM. What soil factors are responsible? Clay? Solvent/solute properties? ● What chemical properties are responsible for the extent of resistance? The resistance is not correlated to Kp. 11

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