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Within a glass flask, titrate 201 mL in the sample with sodium thiosulfate to some pale straw color. Titrate by slowly dropping titrant Resolution from a calibrated pipette into your flask and constantly stirring or swirling the sample drinking water.Should the sample DO is larger than saturation stage if the bottles are placed while in the incubat
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Just after draining, this valve (the second off on the system) is shut. If on the following day or begin-up from the operation the main valve off of your circulating system is opened, then the non-sterile air remaining from the pipe after drainage would contaminate the system. The solution will be to pro-vide for operational methods that present fo