Dataset: Calcium carbonate dissolution experiment Phase 1: Effect of elevated pCO2 on sediment dissolution.

Effect of elevated pCO2 on sediment dissolution. Data are results of Phase 1 of the sediment dissolution experiment described in:

Lantz, C. A., Carpenter, R. C. and Edmunds, P. J.: Calcium carbonate (CaCO3) sediment dissolution under elevated concentrations of carbon dioxide (CO2) and nitrate (NO3−). (2017) J. Exp. Mar. Bio. Ecol., 495, May, 48–56. doi: http://doi.org/10.1016/j.jembe.2017.05.014

The alkalinity anomaly technique was employed to measure changes in seawater total alkalinity inside of stirred benthic chambers. Water samples (75 mL) were taken at the beginning and end of each incubation from 0.6 cm diameter polyvinyl chloride in-line tubes connected to the side of the chamber, and these were used to measure seawater temperature, salinity, pH, and total alkalinity (TA). Temperature was recorded with a thermometer (± 0.05 oC; ThermoFisher Traceable®) and salinity was measured with a bench-top conductivity meter (± 0.1 psu, YSI® 3100). TA and pH were measured within one hour of sample collection. Seawater collected for TA was filtered (0.45 µm; Chanson and Millero, 2007) and analyzed using potentiometric titrations with 0.1-N HCl using an automatic titrator (Mettler Toledo T50) (Dickson et al., 2007). Seawater pH was measured as mV and temperature with a potentiometric electrode (Orion ROSS pH/ATC Triode) and converted to the total scale (pHT) using a calibration relationship prepared using Tris-buffers (Nemzer and Dickson, 2005).

See the publication for a detailed overview of the methodology.