Determination of Biochemical Oxygen Demand (BOD5)
Sampler and Refrigerator Temperature should not exceed 4( C (and samples should not be frozen) pH calibration should be done with either a 4 and 7 buffer or a 7 and 10 buffer, depending on sample pH range. Once calibrated, one of the two buffers should be re-checked as if it was a sample. The measured pH should be within ( 0.1 pH unit of actual pH. ................
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