True" Welcome to the fifth video in a series of tutorials on EPA Method 3/3 4.0 for public water systems in Pennsylvania. In this video, we will cover the initial calibration verification for the grab method in detail, including the requirements for primary standard analysis as well as documentation using the DEP form. The purpose of the initial calibration verification procedure is to verify the accuracy of the factory programmed calibration curve in each instrument. Each meter or titrate used for the collection of regulatory data or comparative grab sampling must successfully complete this procedure. The initial calibration verification needs to be completed for each analysis range that is used for data collection or comparative sampling. Each analysis range uses its own calibration curve, so each range must be verified. The initial verification only needs to be completed once per meter and range, with the exception being any time the meter is serviced or recalibrated, then the initial verification must be repeated. The initial calibration verification requires aqueous primary check standards at a minimum of three concentrations. There are a few additional requirements of the method for the standard concentrations. The standard with the lowest concentration must be less than or equal to 0.2 milligrams per liter. The remaining concentrations should span the analysis range of the method to ensure accuracy across the entire calibration curve. The measured concentration of each standard must be within plus or minus 15% of the reference concentration or the true value of the prepared standard. This table shows how you would plan your three primary standard dilutions for a method with a range up to 2.00 milligrams per liter. The first standard must be less than or equal to 0.20 milligrams per liter. You may want the second standard concentration to be in the middle of the range...
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Video instructions and help with filling out and completing Dd 1750
