Sampling techniques Flashcards
Explain and demonstrate how to handle the Ruttner? Are there any drawbacks or advantages with the equipment?
The ruttner is a water sampler.
Could be cross contamination. Can’t be used in flowing water
Explain and demonstrate how to handle the Ekman grabber? Are there any drawbacks or advantages with the equipment?
You open up the metal edges and fasten them so when you put the grabber in the water and drop a weight on it it will close and get the sediment sample. Negative that you don’t get the layers of the sediments.
Explain and demonstrate how to handle the corer? Are there any drawbacks or advantages with the equipment?
You drop a pipe into the sediments to get the sample. Doesn’t work with all types of sediment, for example very soft sediment. Perks that you get to see layers of the sediments
Explain and demonstrate how to handle the peristaltic pump? Are there any drawbacks or advantages with the equipment?
Peristaltic pump gives groundwater samples. 7 meter depth limit due to it depending on gravity. Has the advantage of being able to change tube after every sample – there will be no cross contamination (the pump itself is up at ground level). No exposure to oxygen. It’s not suitable for volatile substances.
Explain and demonstrate how to handle the bailer? Are there any drawbacks or advantages with the equipment?
Bailer is dropped down in groundwater hole and a weight is dropped to close the bailer. Problem with oxygen coming into the sample. Cheap so it could be used and discarded.
Explain and demonstrate how to handle the riffle splitter? Are there any drawbacks or advantages with the equipment?
Divides your sample into to halves. A good way to decrease the sample size.
Explain and demonstrate how to handle the pH meter calibration and measurements? Are there any drawbacks or advantages with the equipment?
You have to calibrate the pH-meter with two fluids that have a known pH (7 & 4) and then pH is measured in sample until there’s a stable value.
