Rosalina Gonzalez [email protected] June 28, 2011 University of Delaware Welcome to Colombian Deans.
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Transcript of Rosalina Gonzalez [email protected] June 28, 2011 University of Delaware Welcome to Colombian Deans.
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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
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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
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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
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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
Predict adsorption/desorption of MC to soils:
• RDX• HMX• TNT• NG• NQ• 2,4 DNT
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Technical Objective
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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:waterAdd 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
centrifuge
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0.0 0.5 1.0 1.5 2.0 2.5 3.00.0
0.5
1.0
1.5
2.0
2.5
Resistance to Desorption in Matapeake Soil
C (mg/L)
q (
mg
/Kg
)
Adsorption NG
D1D2
D3D4 Adsorption RDX
D1
D2D3
D4
• 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
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Long-Term Desorption: Matapeake Soil
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0 0.5 1 1.5 2 2.50
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2
3
4
5
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C (mg/L)
q (u
g /g
)
qo Even when there’s nothing in solution
Resistant component concentration, q0
qxqxqx
Reversible/Resistant Model
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.
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Es un honor haberlos Tenido en este lugar
Gracias por Venir