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Weighing the Sample

1. Log into the Dual Balance system for the  Cahn Balance. Answer Yes or OK on all prompts that appear during the log-in process. The user's  software. The log-in ID must be is the same as the LIMS database ID.
2. Click Test Option, and enter a number (usually >100 Select Coulometer. Set Measurement count to based on sea state; see the technician for guidance). Click Save/Exit to return to the main window. Scan the Text ID of the sample into the Text ID field. Enter the number of the vial into the Container number field.
3. Fold a small piece of wax weighing paper (~0.5 ~3 cm x 0.5 2 cm) on opposite edges to create a U-shaped wax paper sample boatweighing "boat". Place the wax paper boat on the left weighing pan. Place a similar size of paper boat on the tare pan (right). Close the door , and click Tare, and then Start on the plot screen. The current mass shown in the software between the left and tare (right) weighing pan should be no more than 1.0 mg..
4. Once the tare is finished, add the sample on the weighing pan (~11–13 mg) using a scoop. Observe the weight on the display on the balance, taking the tare value into account, until the weight is acceptable.
5. Press Weigh on the screen. 
6. Once the measurement is finished and the value is acceptable, click Get Mass. The tare value will be changed and the display will clear.
7. Put the sample on the weighing pan (~7–13 mg) using the scoop.
8. Press Weigh on the screen and then Start on the plot panel. The Weigh measurement will not begin if you do not press Start.
9. Once the measurement is done and the value is acceptable, click Get Mass. Final mass value (under the weigh button) will be changed and the display will clear.
10. Select Objective from the list and enter a part of the text ID or label ID of the sample, then click Search.
11. Select a sample from the list, then click Assign to return to the main window.
12. Enter a container number, and click Save to save the mass value into the LIMS. Write down on a piece of paper the mass, container number, text_id, and core information (ie. expedition, site, hole, section, and interval if applicable)., write the mass in the coulometer notebook and click Save. 

Preparing Acidification Module and Coulometer Cell

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