New P01 for pH data [BODCNVS-2030] about emodnetchemvocabs HOT 5 CLOSED

sorry, code 3 as follows:
pH (NBS scale) of the water body by potentiometric glass electrode

to remove: {pH[T]}

from emodnetchemvocabs.

Dear colleagues,

I would like to provide you with some additional information that our chemist has given us:
Three types of pH sensors are installed on the OGS buoys: potentiometric glass electrodes (SeaBird SBE18), ISFET potentiometric sensors (Sea-Brid SeaFET) and spectrophotometric sensors (Sunburst SAMIpH).

The first two parameters requested by Marina are proposed as an alternative to the definitions listed below, which in the opinion of our chemist are not appropriate (incorrect):
PHXXSP03: pH (total scale) {pH[T]} of the water body by spectrophotometry (internal electrode) and manufacturer's calibration applied
PHX XSP04: pH (total scale) {pH[T]} of the water body by spectrophotometry (external electrode) and manufacturer's calibration applied
PHXXSP05: pH (total scale{pH[T]}) of the water body by spectrophotometry (external electrode) and manufacturer's calibration and correction against independent temperature and salinity measurements
PHXXSP06: pH (total scale) {pH[T]} of the water body by spectrophotometry (internal electrode) and manufacturer's calibration and correction against independent temperature and salinity measurements
PHXXSP07: pH (total scale) {pH[T]} of the water body by spectrophotometry (external electrode) and manufacturer's calibration and laboratory calibration against TRIS-buffer applied
The reason why these definitions are not applicable is that no spectrophotometric measurement is performed by the Seafet sensor, on which only ISFET sensors and electrochemical reference electrodes are installed.

The third parameter requested by Marina is proposed as an alternative to PHNBWCAL: pH (NBS scale) of the water body by computation, which is not appropriate for us.
In fact, the definition states: “Carbonate system parameter calculated from two of pCO2, DIC, TA and pH that have been directly measured in a sample collected from a water body”, while in our case the pH is not calculated from two variables of the carbonate system, but measured directly with the glass electrode.

I hope this can help to improve the coherence of the pH vocabulary.
With kind regards,
Alessandra

from emodnetchemvocabs.

Created two new P01 terms in response to the first two of the three requested. Analytical method requires further clarification and has been queried by Sam.

PHXXFE02 - pH (total scale) {pH[T]} of the water body by ion sensitive field-effect transistor (ISFET) sensor (internal counter electrode) and manufacturer's calibration applied
https://vocab.nerc.ac.uk/collection/P01/current/PHXXFE02/

PHXXFE03 - pH (total scale) {pH[T]} of the water body by ion sensitive field-effect transistor (ISFET) sensor (external counter electrode) and manufacturer's calibration applied
https://vocab.nerc.ac.uk/collection/P01/current/PHXXFE03/

from emodnetchemvocabs.

Please notice that the definition of:
https://vocab.nerc.ac.uk/collection/P01/current/PHNBISGE/
is NOT CORRECT! It is the same as: https://vocab.nerc.ac.uk/collection/P01/current/PHNBWCAL/
and it should be: The concentration of hydrogen ions directly measured by the glass electrode

from emodnetchemvocabs.

Thankyou for your feedback, please find:
PHNBISGE - pH (NBS scale) {pH[NBS]} of the water body by in-situ glass electrode
https://vocab.nerc.ac.uk/collection/P01/current/PHNBISGE/

The description has been amended in our system and will be updated online by tomorrow.

from emodnetchemvocabs.