Ionics Instruments 2004 Page E - 7 DLM 30007-08 Rev. A
Concentration of
=
Weight of Na
2
CO
3
in grams * 12.01 g C/mol * 1000
stock IC standard (0.1 L) * (105.99 g/mol)
Conc. of stock IC standard (ppm C) ____________________________
Part 2 – Prepare a Dilute IC Standard:
Use a volumetric pipette to transfer 50 mL of the stock IC standard to a 1 liter
volumetric flask and dilute with low TOC, deionized water. Calculate and
record the concentration of the dilute standard (~25 ppm C) using the formula:
Concentration of = Conc. of stock IC standard * 0.05
dilute IC standard
Conc. of dilute IC standard (ppm C) ___________________________
(If using Ionics Instruments-prepared standard, the concentration value is on
the vial.)
WARNING
Measure the dilute IC standard immediately after preparation. If exposed to air
for more than an hour, the standard will absorb atmospheric CO
2
and have a
higher IC concentration than calculated.
Use the dilute IC standard immediately. The stock IC standard may be stored
in a sealed, dark bottle under refrigeration for 1 week.
Proceed to Calibration chapter to perform Calibration procedure.
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