Method Modifications. Mentoring Session Technical Assistance Committee. TNI Training Disclaimer.
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Technical Assistance Committee
The primary objective of method
modifications is to enhance precision and
accuracy for each analysis.
Such as commercial and private (including municipalities) must prove that their method modification to any approved standard analytical method is valid.
The information and supporting data, required during the validation, must be sufficient to allow an independent reviewer (EPA, state or contractor) to verify each determination and calculation performed by the laboratory.
When using 1000 mL sample, the pipet used in the method is a 25 mL wide bore, this would take an analyst 40 separate measurements to deliver the volme
Standard Methods 2540 D.
Total Suspended Solids
3 (b) states to stir the sample and pipet an aliquot from the midpoint of the container
Modification: Using a graduated cylinder (1000 ml) instead of the 25mL pipet, reduces analyst time and handling of the sample