TCE CONTAMINATION AND CLEANUP CURRICULUM OXIDATION OF TCE WITH

15A NCAC 02L 0411 ESTABLISHING MAXIMUM SOIL CONTAMINATION CONCENTRATIONS
A COLLABORATIVE APPROACH REQUIRED TO END PERIODIC VEGETABLE CONTAMINATION
APPENDIX 4 DECONTAMINATION GUIDANCE FOR SPECIFIC EQUIPMENT CLEAN EQUIPMENT

CHAPITRE II CONTAMINATION PAR LES AGENTS PATHOGENES ET
CHLORINE CONTAMINATION DIFFUSION IN SILICONES PAGE 5 OF 5
CHROMIUM CONTAMINATION OF THE LJUBLJANSKO POLJE AQUIFER MITJA


TCE CONTAMINATION AND CLEANUP CURRICULUM OXIDATION OF TCE WITH

TCE CONTAMINATION AND CLEANUP CURRICULUM OXIDATION OF TCE WITH

TCE Contamination and Cleanup Curriculum




Oxidation of TCE with Potassium Permanganate


Written by Christopher Martin

Editor: Stephanie Nardei


Time:

2 class period

Preparation Time:  

1 hour to make solutions

Materials:

Acidified ferrous sulfate 0.0025M

FeSO4·7H2O (0.7g /1000 ml.) + 25ml. of 2M H2SO4


Potassium permanganate 0.01M

KMnO4 (0.4g per 250ml)


ATCE CONTAMINATION AND CLEANUP CURRICULUM OXIDATION OF TCE WITH bstract

Students consider the threat posed by TCE in the ground water. They learn how TCE is removed by treating the water with potassium permanganate. Students learn how electron transfer takes place in this oxidation/ reduction reaction.


Objectives

Students will be able to explain how:


National Science Education Standards:
The Designed World

B. Materials and Manufacturing

Waste management includes considerations of quantity, safety, degradability, and cost. It requires social and technological innovations, because waste-disposal problems are political and economic as well as technical.


Arizona Science Standards

Strand5

Physical Science

Concept 4: Chemical Reactions; Investigate relationships between reactants and products in chemical reactions.

PO.13

Determine the transfer of electrons in oxidation/reduction reactions.

gical innovations, because waste-disposal problems are political and economic as well as technical


Teacher Background


Chlorinated ethylenes, especially trichloroethylene (TCE) and tetrachloroethylene (PCE), are some of the most frequently detected groundwater contaminants in the US, especially in Tucson, and have been identified as priority pollutants by the EPA. Oxidation of chlorinated ethylenes using potassium permanganate has been demonstrated to be a rapid and effective technique for remediation. As with other degradation processes affecting these contaminants, stable isotope analysis has the potential to qualify and/or quantify the efficacy of permanganate oxidation as a remediation technique.


Many contaminants in groundwater can be treated using redox reactions. Redox (oxidation and reduction) is a natural process and often used in chemistry.


Related and Resource Websites

Chemical Oxidation In Depth: Potassium Permanganate Oxidation http://www.terratechnik.ca/Current-Environmental-Issues-Articles/potassium-permanganate.html

EPA EIMS Metadata Report – Document http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=23249

Reduction and Oxidation Reactions http://www.chemtutor.com/redox.htm


Activity






  1. Assign oxidation states to the elements and ions

  2. Balance the electron transfer. It is important that the same number of electrons are used for the oxidation and reduction reactions

  3. Without changing the electron transfer, balance the equation

Solution

KMnO4 + C2Cl3H CO2 + K+ + Cl- + H+ + MnO2

+1 +7 -2 +1 -1 +1 +4 -2 +1 -1 +1 +4 -2

The Manganese and carbon atoms change oxidation state. All others remain unchanged. We must balance the Manganese and Carbons. There are two carbons on the left side and 1 on the right side. Therefore;

KMnO4 + C2Cl3H 2CO2 + K+ + Cl- + H+ + MnO2

The Manganese is reduced (gains 3 electrons) and the two Carbons are oxidized each (lose 3 electrons). Therefore, we have 6 electrons lost and 3 electrons gained. So, we need two manganese;

2KMnO4 + C2Cl3H 2CO2 + K+ + Cl- + H+ + 2MnO2

The electron transfer can be added to the equation, but they should cancel each other out;

6e- + 2 KMnO4 + C2Cl3H 2 CO2 + K+ + Cl- + H+ + 2 MnO2 + 6e-



Finally, the other elements/ ions should be balanced without affecting the electron transfer.


6e- + 2 KMnO4 + C2Cl3H 2 CO2 + 2K+ + 3Cl- + H+ + 2 MnO2 + 6e-

To assess student knowledge, students can balance the redox reaction between PCE and KMnO4. PCE (tetrachloroethylene) C2Cl4 is another contaminant found in ground water that can be treated with potassium permanganate. Students should write a balanced equation for this reaction. A redox lab is available at: http://www.sas.upenn.edu/~tloschia/AP/labs/iron-redox.htm.

Extension Using this equation, the students can calculate the mass of potassium permanganate required to treat a million liters of water with 26 parts per billion of TCE. The solution can be found on a power point presentation by Tucson students Kris Bjelk and Matt Johnson.

Embedded Assessment

Successful balancing of the PCE oxidation with potassium permanganate will demonstrate understanding of the concept. Further examples of redox reactions can be found at; http://dbhs.wvusd.k12.ca.us/webdocs/Redox/Redox.html

Homework

n/a






CONTAMINATION ASSESSMENT SCREENING ASSESSMENT FORM (VERSION 52)
CONTAMINATION BY METALLIC ELEMENTS RELEASED FROM JOINT PROSTHESES E
CROSS CONTAMINATION BACKGROUND OUR HOMES MAY BE AN IDEAL


Tags: cleanup curriculum, curriculum, contamination, cleanup, oxidation