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Laboratory Certification

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    BOD troubleshooting

    What's causing bias? Contamination? Calibration?

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    BOD Toxicity

    Sample toxicity Often referred to as "sliding" BODs BOD decreases as sample volume increases (i.e., less dilute) Occurs frequently in systems receiving industrial waste Amounts to killing off (or severe shock to) "the bugs" Results in under-…

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    BOD seed

    Seed preparation and addition De-ionized water kills - Adding a seed capsule to deionized water causes an osmotic imbalance that will kill seed organisms. The purified water —containing no salts— rushes across the bacterial cell walls. The bacteria…

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    Sampling and sample handling for BOD

    Water and wastewater samples are biologically active, and the BOD will quickly deteriorate. Minimize the time between sampling and analysis to obtain the best BOD results. Take the following precautions when sampling and handling BOD samples.…

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    BOD resources

    Websites Field Training Manual for Laboratory Analysts: Chapter 7 - BOD Biochemical Oxygen Demand Source: http://home.windstream.net/mikeric/Chap1to9/Chap7%20Biochemical%20Oxygen%20Demand.htm-->

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    BOD quality control

    Limit of detection (LOD) BOD detection limits are theoretically based. A key assumption which the concept of detection for BOD is based is that the LEAST amount of depletion allowable is 2 mg/L. The LOD is also based on the highest volume of sample…

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    BOD sample pre-treatment

    Because the BOD test is a bioassay, it is critical to maintain optimal conditions for the "bugs" (bacteria and other microorganisms) to remain viable. Temperature, pH, oxygen levels and the presence of disinfectants can all influence the outcome of…

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    cBOD

    Nitrogenous Oxygen Demand (NOD) cBOD v. BOD - If you have Nitrogenous Oxygen Demand (NOD) you should consider analyzing cBOD vs. BOD

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    Method Details

    The following are the critical steps in preparing and analyzing samples for BOD testing. The BOD test is a method-defined (empirical) technique. Consequently, the method must be followed carefully, and must be performed consistently from day to day…

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    BOD equipment and supplies

    BOD Incubator Thermostatically controlled at 20± 1°C.

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