When dissolved oxygen is to be measured in water samples, what should be observed during sampling and measurement? It is best to mix sample prior measurement to get a representative DO The container must not be filled to the brim to allow headspace Composite sampling is best used if sample is for dissolved oxygen analysis Water samples are best measured for dissolved oxygen immediately A certain manufacturing plant produces dairy products. Which of the following effluent parameters are considered significant for monitoring? Total Suspended Solids, Surfactants, Oil and Grease Total Suspended Solids, Nitrate, Oil and Grease Total Suspended Solids, Boron, Oil and Grease Total Suspended Solids, Phosphates, Oil and Grease

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