Methods selection
Frequently there are multiple test methods that can be used to measure a given parameter. You need to meet specific quality and detection limit objectives. You may not be sure of the possible matrix effects specific to your samples. You need to control costs and maintain quality. It seems there is a never ending maze of EPA Method numbers for analytical procedures as well as various preparative and clean-up methods. What about holding times, container requirements, and preservation?
The more specific you are about protocols the better the chances that your project will meet your quality objectives and budget constraints.
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