I am developing a model of dissolved oxygen (DO) consumption by yeast in the fermentation process. I would like to use a solution that will predictably take up DO over the course of 1 or 2 hours so that I can test a more basic model with the laboratory equipment I have. This would prove I have the means to test a model of the more complex fermentation process. The DO will be bubbled up through the solution in a fermentation tank. I am a senior Bioengineering undergraduate student, and I do not have much experience with or knowledge of useful chemicals so I need your help. What cost effective chemicals will take up DO over the course of 1 to 2 hours, much the way yeast consumes DO in the fermentation process?