Ionics Instruments 2004 C-8 DLM 30007-08 Rev. A
dilute 2 ppm standard by transferring 5 mL of the 400 ppm stock with a
calibrated pipette into a 1 L flask. Fill the flask to volume using water from the
same source characterized earlier. Calculate the value of the dilute standard
in the same way shown in the Calibration chapter.
Place the analyzer in turbo mode, then perform a TC channel calibration
according to the instructions in the Calibration chapter. Use the preset flow
rates of ACID = 2.0 and OXID = 0.5. Once the readings have stabilized, stop
the analyzer by pressing ENTER and then selecting STOP TOC. Use
HISTORY to view the data, then average the last five TC values to determine
an accurate TC value for the 2 ppm standard.
If necessary, access the TURBO TC CALIB. CONSTANT by selecting TURBO
TOC CALIB. from the CALIBRATE sub-menu, then choosing TC CALIB.
CONSTANT. Calculate and enter the new TURBO TC CALIB. CONSTANT as
instructed in the calibration chapter.
Turbo Mode IC Channel Calibration
Prepare a nominal 2 ppm Na
2
CO
3
standard instead of the 25 ppm standard
indicated in the Calibration chapter. This may easily be accomplished by
preparing the stock solution in a 250 mL volumetric flask rather than a 100 mL
flask. This will produce a nominal 200 ppm stock when 0.441 grams of
Na
2
CO
3
are used to prepare the stock. Make the dilute 2 ppm standard by
transferring 10 mL of the 200 ppm stock with a calibrated pipette into a 1 L
flask. Fill the flask to volume using water from the same source characterized
earlier. Calculate the value of the dilute standard in the same way shown in
the Calibration chapter.
Place the analyzer in Turbo mode, then perform an IC channel calibration
according to the instructions in the calibration chapter. Use the preset flows of
ACID = 2.0 and OXID = 0.5. Once the readings have stabilized, stop the
analyzer by pressing ENTER, then selecting STOP TOC. Use HISTORY to
view the data, then average the last five IC and TC values to determine
accurate IC and TC values for the 2 ppm standard.
Access the TURBO IC CALIB. CONSTANT by selecting TURBO TOC CALIB.
from the CALIBRATE sub-menu, then choosing IC CALIB. CONSTANT.
Calculate and enter the new TURBO IC CALIB. CONSTANT as instructed in
the calibration chapter.
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