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wool <br /> _____ <br /> UVEnvironmental <br /> 6. Place electrode in sample and stir moderately. Allow reading to stabilize. <br /> 7. Record the sample pH value displayed on the field data sheet or in the bound <br /> logbook, as applicable. <br /> NOTE: :If the sample temperature differs significantly (by one degree or more) from the <br /> buffer temperature used to calibrate the meter, make an adjustment. Raise or lower the <br /> °C/slope control from its current setting by the difference between the current °C/slope <br /> setting and the sample temperature. <br /> DISSOLVED OXYGEN MEASUREMENTS <br /> Dissolved oxygen measurements are taken using ORION Model 97-08 oxygen electrode shown <br /> on Figure D-2 and ORION SA-210 meter set to the pH mode. The reading is displayed in parts <br /> per million (ppm). If another dissolved oxygen meter or electrode is used, refer to <br /> manufacturer's directions. <br /> Calibration Procedure <br /> 1. Connect electrode to the Orion SA-210 meter. <br /> 2. Assemble the components for the test setup, shown on Figure D-2 as follows: <br /> Insert the funnel into a Biological Oxygen Demand (BOD) sample bottle <br /> containing enough sample water to just cover the bottom. <br /> CO2118 <br />