Rosalina Gonzalez

rosalina@udel.edu

June 28, 2011

University of Delaware

Welcome to Colombian Deans

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

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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

1

2

3

4

5

6

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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