Wastewater Analysis Flashcards
What is one milligram per liter (mg/L) equivalent to?
One part per million (1.0 ppm).
What is the lowest value an analytical balance can normally measure?
0.1 mg or 0.0001g.
What is the minimum pH allowed in the effluent as specified in the NPDES permit?
pH of 6.0.
What is a neutral pH?
pH of 7.0.
Where is the ideal location to collect samples to test for NPDES permit limits compliance?
The location where the water leaves the treatment pond or facilities (outfall location).
I collected samples for total suspended solids. How long can I keep them and how?
The samples can be kept seven days if refrigerated at 4 degrees Celsius.
How long can I store an oil and grease sample and how should it be stored?
It can be stored 28 days if the sample pH is lowered to less than 2.0 with -SULFURIC ACID- (H2SO4) and stored at 4 degrees Celsius.
How long can a sample for iron analysis be stored and how should it be stored?
It can be kept 6 months if the sample pH is lowered to less than 2.0 with -NITRIC ACID- before storage.
How long can I hold a sample for pH analysis and how should I store it?
You should run a pH test immediately after sampling. No storage is allowed since the pH may change during storage.
Other than testing for pH immediately, what is the next important item one should be aware of for measurement of pH?
The pH meter needs to be calibrated before the measurement, using known pH standards.
How many pH standards should be used to calibrate a pH meter?
Two pH standards should be used to bracket the antipated sample pH. For example, if the sample pH is expected approximately 7.5, pH standards of 7.0 and 10.0 should be used to calibrate the pH meter probe.
How long can I keep the pH standard solution?
IDEM recommends replacing the pH standard solution after six months.
