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Mass spectra of sulfonephthalein pH indicator dyes and their impurities

Metadata Updated: July 29, 2022

Sulfonephthalein pH indicator dyes have historically been noted for impurities originating from the synthesis process which lead to batch to batch differences in pH measurements. Uncertainties up to 0.1 pH units have been attributed to impurities in these reagents. In an effort to understand the extent of impurities in these dyes and the potential impact on the expanded uncertainty of pH measured by this technique, we have examined seven commercially available sulfonephthalein pH indicators using liquid chromatography-mass spectrometry (LC-MS): bromocresol green (BCG), bromocresol purple (BCP), bromothymol blue (BTB), cresol red (CR), meta-cresol purple (MCP), phenol red (PR), and thymol blue (TB). Peaks eluting from the LC (Figure 1) were subjected to fragmentation by mass spectrometry. The resulting dataset will aid in efforts to improve the synthesis or purification of these dyes.

Access & Use Information

Public: This dataset is intended for public access and use. License: See this page for license information.

Downloads & Resources

References

https://doi.org/10.6028/jres.122.021

Dates

Metadata Created Date March 11, 2021
Metadata Updated Date July 29, 2022
Data Update Frequency irregular

Metadata Source

Harvested from NIST

Additional Metadata

Resource Type Dataset
Metadata Created Date March 11, 2021
Metadata Updated Date July 29, 2022
Publisher National Institute of Standards and Technology
Maintainer
Identifier 3DF9EB5C7EEFBBE3E0531A570681B5811503
Language en
Data Last Modified 2015-11-25 00:00:00
Category Environment:Air / water / soil quality, Chemistry:Analytical chemistry, Environment:Environmental health
Public Access Level public
Data Update Frequency irregular
Bureau Code 006:55
Metadata Context https://project-open-data.cio.gov/v1.1/schema/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id b6d727c1-5e73-46b7-ab79-6d886e578cf0
Harvest Source Id 74e175d9-66b3-4323-ac98-e2a90eeb93c0
Harvest Source Title NIST
Homepage URL https://data.nist.gov/od/id/3DF9EB5C7EEFBBE3E0531A570681B5811503
License https://www.nist.gov/open/license
Program Code 006:045
Related Documents https://doi.org/10.6028/jres.122.021
Source Datajson Identifier True
Source Hash 5348d4aafdd4e763b9281ada12b9f50b15fd344d
Source Schema Version 1.1

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