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Once the sample is placed in the reaction vial, acid is added to release CO2 gas. This gas is carried through the coulometer cell and into the titration cell, where the sample is titrated by the coulometer automatically and the software plots µg carbon vs. time. The software evaluates the slope of the plot against a drift threshold and then compares the slope against $Threshold_slope (method-determined value equivalent to 29% transmittance) to determine when the titration is complete. When the threshold is reached, titration halts and the final result is expressed in µg C, from which weight percent (wt%) CaCO3 can be calculated.
Running Samples
Prepare the coulometer cell, place it in the coulometer and connect the leads before turning on power.
- Turn on the heating unit and power to the main coulometer unit.
- Choose Emulation Mode on the screen.
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