# Experimental unified pH scale in 1,2-dichloroethane


====== General Information ======

This dataset comprises of open-circuit potential values recorded between two metal solid-contact glass electrode half-cells, which contain equimolar buffer solutions prepared in low-polarity solvent 1,2-dichloroethane (1,2-DCE). It includes 213 differential potential measurements from 1,2-DCE solutions of 19 compounds, as well as two bridging solutions (10 mM ammonium formate in absolute ethanol and a 60:40 acetonitrile/pH 4 formate solution) and standard aqueous buffer solutions at pH 4.01, 7.00, and 10.01. Additionally, the dataset provides processed data and the assigned pHabs values for the compounds in 1,2-DCE.


====== Author(s) Information ======

John Paulo Samin*, Agnes Heering, Jaan Saame, Agnes Kütt, Ivo Leito*
Institute of Chemistry, University of Tartu
Ravila 14a, 50411 Tartu, Estonia
*Email: john.paulo.aquino.samin@ut.ee; ivo.leito@ut.ee


====== Methodological Information ======

Instrument:	Keysight B2987A Electrometer/High Resistance Meter
Software:	Keysight Quick IV Measurement Software

----- Measurement Settings ---------------------------------------------------
	Source Function:	OPEN
	Voltage Range:		Fixed 2V
	Hold:			0 s		
	Interval:		10 s
	Sampling points:	361 - 1801 (depending on measurement duration)
	Measure Speed:		Long (Number of Power line cycles, NPLC = 10)

Files are saved in .csv format.
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====== Dataset File Information ======

----- Raw_Data.zip -----

This compressed folder contains 213 raw potentiometric measurement data files in .csv format.

Each .csv file is formatted in a single column with the following data structure:

Repeat;Point;CH1 Voltage;CH1 Time
1;1;-2,41475E+000;0,00000E+000
1;2;-2,41476E+000;10,00000E+000

"Repeat" is the number of repetitions and is always 1.
"Point" is the data point number.
"CH1 Voltage" is the OCP in volts given in scientific format, with a comma as the decimal separator.
"Time" is the data sampling time in seconds.

----- Processed_Data.xlsx -----

This spreadsheet (.xlsx) file contains the following sheets:

--- Measurement Data ---

This sheet presents the measurement data with the following columns:

Date (dd-mm-yyyy): Date of measurement
Inclusion: Indicates whether the measurement is included or excluded from the minimization process
Pairing Code: specifies the solutions used in the measurement
Sample solution (Left): Solution in ion-selective electrode 1 (ISE1)
Sample solution (Right): Solution in ion-selective electrode 2 (ISE2)
Salt bridge: Ionic liquid used
ISE1/ISE2: Serial numbers of ion-selective electrode 1 and 2
Data Points/s: Time interval range used for the measurement
∆Eavg/mV: Mean values of measurement data points
Stdev/mV: Standard deviation of the measurement data points
Drift/ mV/h: Drift of the measurement result
Slope/mV: Slope of the calibrated electrodes
∆pHavg: pH difference result of the measurement
Potentiostat: Instrument used for the measurement
Electrochemical Setup: Salt bridge setup used for the measurement
				
--- Minimization ---

This sheet includes the assigned pHabs values of the compounds in 1,2-DCE derived from the minimization results, along with the number of measurements and the consistency standard deviation.


====== Funding Information ======

This research was funded by the Estonian Ministry of Education and Research (TK210) and by the Estonian Research Council grant PRG690. This work was carried out using the instrumentation at the Estonian Center of Analytical Chemistry (TT4, https://www.akki.ee).


====== License ======

This dataset is licensed under the Creative Commons Attribution 4.0 International License [CC-BY 4.0]. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/