This test measures Dissolved Oxygen (DO) and Biochemical Oxygen Demand (BOD). It's important to note that there are different directions depending on what you're testing. The dissolved oxygen test takes about 10 minutes (4-5 minutes for the tablets to dissolve and another 5 for the color to develop). The biochemical oxygen demand test takes 5 days. During this time you must cover the vial with aluminum foil and keep it in a dark place. For both, compare the color to the table to determine ppm, but only 0, 4 and 8ppm are shown for both. Exams. I wish it had more than 2 glass vials but that's just for my needs. I think there is an idea for DO and one for BOD.
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