U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Breadcrumb

  1. Home

Mass spectra of sulfonephthalein pH indicator dyes and their impurities

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.

About this Dataset

Updated: 2024-02-22
Metadata Last Updated: 2015-11-25 00:00:00
Date Created: N/A
Views:
Data Provided by:
pH indicators
Dataset Owner: N/A

Access this data

Contact dataset owner Landing Page URL
Download URL
Table representation of structured data
Title Mass spectra of sulfonephthalein pH indicator dyes and their impurities
Description 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.
Modified 2015-11-25 00:00:00
Publisher Name National Institute of Standards and Technology
Contact mailto:benjamin.place@nist.gov
Keywords pH indicators , mass spectrometry , seawater pH
{
    "identifier": "3DF9EB5C7EEFBBE3E0531A570681B5811503",
    "accessLevel": "public",
    "references": [
        "https:\/\/doi.org\/10.6028\/jres.122.021"
    ],
    "contactPoint": {
        "hasEmail": "mailto:benjamin.place@nist.gov",
        "fn": "Benjamin Place"
    },
    "programCode": [
        "006:045"
    ],
    "@type": "dcat:Dataset",
    "landingPage": "https:\/\/data.nist.gov\/od\/id\/3DF9EB5C7EEFBBE3E0531A570681B5811503",
    "description": "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.",
    "language": [
        "en"
    ],
    "title": "Mass spectra of sulfonephthalein pH indicator dyes and their impurities",
    "distribution": [
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_2.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_3.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_1.cdf.sha256",
            "mediaType": "text\/plain"
        },
        {
            "accessURL": "https:\/\/doi.org\/doi:10.18434\/M3JP40"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BTB_LG1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_1.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_PR_AA1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_TB_AC1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCP_AA1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_BCG_AA1_2.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_CR_AA1_3.cdf",
            "mediaType": "text\/plain"
        },
        {
            "downloadURL": "https:\/\/opendata.nist.gov\/1503_MCP_PB1_1.cdf",
            "mediaType": "text\/plain"
        }
    ],
    "license": "https:\/\/www.nist.gov\/open\/license",
    "bureauCode": [
        "006:55"
    ],
    "modified": "2015-11-25 00:00:00",
    "publisher": {
        "@type": "org:Organization",
        "name": "National Institute of Standards and Technology"
    },
    "accrualPeriodicity": "irregular",
    "theme": [
        "Environment:Air \/ water \/ soil quality",
        "Chemistry:Analytical chemistry",
        "Environment:Environmental health"
    ],
    "keyword": [
        "pH indicators",
        "mass spectrometry",
        "seawater pH"
    ]
}

Was this page helpful?