Dataset: Durafet methods development: replicate spectrophotometric pH measurements

Name: Average pH from replicate spectrophotometric measurements during laboratory experiments using a Durafet pH sensor in February of 2017 (pHVAR project)
Published: 2018-01-16
Keywords: oceans

Cite This Dataset

Project:

OCE PRF: Track 2 (International) Indirect effects in a changing ocean: a case study of seagrass photosynthesis and mussel physiology (pHVAR)

Principal Investigator:

Lydia Kapsenberg (Université Pierre et Marie Curie (Paris 6), UPMC)

Contact:

Lydia Kapsenberg (Université Pierre et Marie Curie (Paris 6), UPMC)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2018-01-16

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Average pH from replicate spectrophotometric measurements during laboratory experiments using a Durafet pH sensor in February of 2017 (pHVAR project)

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Description

Average pH from replicate spectrophotometric measurements during a laboratory experiment using Durafet pH sensors. This experiment was conducted at Villefranche-sur-Mer, France on Feb. 27th, 2017.

The pH time series from Durafet sensors collected during this experiment are available in a separate dataset:
Durafet methods development: pH time series
https://www.bco-dmo.org/dataset/723336

These data are presented in the following publication:

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

Methods & Sampling

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

Data Processing Description

BCO-DMO data manager processing notes:
* Added ISO format timestamp (UTC)
* two different timestamp formats in the originally named "Time" column. Changed the format of the numeric values to match the rest of the dataset (Timestamp_local, dd-mm-yy HH:MM)

Data Files

File
phAvs.csv (Comma Separated Values (.csv), 496 bytes) MD5:a95cc4b2043b54c08eb32430d47e27ca Primary data file for dataset ID 723785

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1521597

Deployments

None available yet

Instruments

pH Sensor

Supplied Name: Honeywell UDA2182 and Honeywell Durafet III pH electrodes

Supplied Description:

Instrument Type

Generic Name: pH Sensor

Generic Description:

An instrument that measures the hydrogen ion activity in solutions.

The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Timestamp_local	Local Date and Time (France CET/CEST) in format yyyy-mm-dd HH:MM	unitless	DateTime
ISO_DateTime_UTC	ISO timestamp based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MMZ (UTC)	unitless	ISO_DateTime_UTC
Spec_pH_AVG	Average pH over 3 replicate spectrophotometric pH measurements	total hydrogen ion scale	pH

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Database

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Dataset: Durafet methods development: replicate spectrophotometric pH measurements