Hex High
hex chrome to tri-chrome problems? can you help!?!?
In a wastewater treatment scheme i am converting hex chrome to tri chrome using sodium bisulfite. when i lower the pH to 2.5, react with the bisulfite for 2 hours, i get the typical change from yellow to green/blue solution, showing the rection has taken place. i have calculated a 200% excess in the calculated stoichiometric equivalent based on the chromium concentration. however then when i raise the pH back to 7.5, the solution turns yellow and the atomic absorption reads a higher number than initally. Does anyone know what can be causing this? thanks for your help!
You may not be digesting the samples to the same extent in each case. Make sure you are using a full digestion with a microwave technique being better. You have also left out the step of filtering the high pH sample and also the pH should 8.0 or higher. A pH of 7.5 may not do it. In real systems, we go above 8.0.
Jonah Hex [ high quality | part 1/12 ]
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