Field Analysis Flashcards
Examples of field measurements
- temp
- pH
- EC
- DO
- turbidity
- residual chlorine
- hydrocarbon vapour
- immunoassays
Field quality control
-collecting representative samples
-using appropriate equipment
-proper handling and preservation
-proper chain of custody
-proper QA/QC
Field equipment must be:
Calibrated
Documented:
Name, model, serial number, method of calibration, date and time, results of qc
What is an immunoassay field test
Uses natural response of an organism to a foreign material as the mechanism of detection and measurement
Immunoassay process
- sample is added to tube coated with enzyme catalyze antibody
- the antigen (environmental pollutant test is designed to detect) is added
- the pollutant and antigen fight for antibody sites on the walls of the container
- Chem’s are added that react with the antigen/antibody to produce colour
- concentration of pollutant is inversely proportional to the intensity of the colour
Dissolved oxygen
Required for the process of photosynthesis and respiration
Typical levels are between 6-14
DO goes up and water temp goes down
Oxygen sag summary
1) clean zone- icy and bac levels are normal, no pollutant added
2) decomposition zone- pollutants released to water way, DO begins to decline as bac begin to decompose the organic pollutant
3) septic zone- lowest [] of DO observed, bac popn reaches maximum
4) recovery zone- DO begins to increase due to aeration, bac popn decline w/ lack of food
5) clean zone
