Reports
Understanding Control Charts

Understanding Control Charts

What are control charts? Control charts are a visual depiction of ongoing data points that various statistics are applied to.  The EPA used to require a laboratory to adjust its spike acceptance recovery percentage based upon how spikes were recovered over time...

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The Argument on “Total” Metals

The Argument on “Total” Metals

Why is there still an argument about which digestion method should be reported as “total” metals? When you’re looking at an old QAPP, permit or analytical report, you might have noticed that there were different listings for how the metals were to be identified and...

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