Dataset: Durafet methods development: replicate spectrophotometric pH measurements

These data originate from methods development of UDA-Durafet pH electrodes. Briefly, pH electrodes are calibrated against spectrophotometric pH measurements prior to the experiment. A post-calibration spectrophotometric pH measurement is used to correct the time series to the same pH value at the time of sampling, at the end of the experiment. Upon conclusion of the experiment, spectrophotometric pH measurements are used to identify any change in electrode performance. The precision of pH measurements is 0.008 (Kapsenberg et al., 2017). Data are not corrected for any offset in post-experiment spectrophotometric pH measurement.

Sampling and analytical procedures (Spectrophotometric pH measurement using purified m-cresol) are Dickson et al. 2007.

References:

Dickson, A. G., Sabine, C. L., & Christian, J. R. (2007). Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, p. 191.
Available at http://cdiac.ess-dive.lbl.gov/ftp/oceans/Handbook_2007/Guide_all_in_one.pdf 

Kapsenberg, L., Bockmon, E. E., Bresnahan, P. J., Kroeker, K. J., Gattuso, J. P., & Martz, T. R. (2017). Advancing ocean acidification biology using Durafet® pH electrodes. Frontiers in Marine Science, 4, 321. doi:10.3389/fmars.2017.00321