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OBSP Data Assessment Tools

The Branch of Quality Systems (BQS) operates an Organic Blind Sample Project (OBSP). One of the goals of the project is to document bias and variability for the National Water Quality Laboratory (NWQL) through the use of blind quality assurance (QA) samples. From these summaries, data users can be informed of the NWQL's performance on QA samples that parallel their own environmental samples.

All data is provisional and may change if the OBSP deems necessary.

A red analyte name is an indication of a permanently estimated compound .

Time Series Charts
False Positive and False Negative Charts
Recovery vs Concentration Charts
Box Plots of Analyte Recovery Over Time
One Graph Box Plot of an Entire Method
Analytes in Multiple Methods
OBSP Products by Analyte

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Page Last Modified: March 26, 2018