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Perchlorate in milk.

Andrea B Kirk1, Ernest E Smith, Kang Tian

  • 1The Institute of Environmental and Human Health, MS 1163, USA.

Environmental Science & Technology
|November 19, 2003
PubMed
Summary
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Perchlorate contamination was found in all tested supermarket milk samples in Lubbock, TX. This study details the detection and quantification of perchlorate in milk using advanced analytical methods.

Area of Science:

  • Environmental Chemistry
  • Food Safety Analysis
  • Analytical Chemistry

Background:

  • Perchlorate is an environmental contaminant with potential health implications.
  • Milk is a widely consumed food product, making its safety a public health concern.
  • Previous studies have investigated perchlorate in various food matrices, but milk analysis requires specific methods.

Purpose of the Study:

  • To detect and quantify perchlorate in commercially available milk samples.
  • To establish a reliable analytical method for perchlorate determination in milk.
  • To assess the potential dietary exposure to perchlorate through milk consumption.

Main Methods:

  • Ion chromatography-suppressed conductivity (IC-CD) and ion chromatography-electrospray mass spectrometry (IC-MS) were employed for perchlorate detection.

Related Experiment Videos

  • A robust sample cleanup procedure involving protein removal (ethanol) and solid-phase extraction (activated alumina, C-18 silica) was developed.
  • A preconcentration-preelution technique was utilized to enhance sensitivity.

    • Main Results:

    • Perchlorate was unambiguously detected in all seven tested supermarket milk samples.
    • Quantitation using IC-MS and IC-CD yielded comparable results.
    • The limit of detection for perchlorate in milk was established at 0.5 microg/L.
    • Detected perchlorate levels in liquid milk samples ranged from 1.7 to 6.4 microg/L.
    • Evaporated milk showed a perchlorate level of 1.1 +/- 0.6 microg/L; no perchlorate was detected in reconstituted powdered milk.

    Conclusions:

    • Commercially available milk in Lubbock, TX, is a source of perchlorate exposure.
    • The developed analytical method is effective for sensitive and accurate perchlorate determination in milk.
    • Further research is warranted to understand the sources of perchlorate in milk and its long-term health effects.