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Related Experiment Videos

Hair--metal binding.

T A Hinners, W J Terrill, J L Kent

    Environmental Health Perspectives
    |August 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Human hair analysis reveals varying metal extraction efficiencies, impacting interpretations of metal binding and incorporation. This study quantifies metal levels for assessing intoxications and deficiencies.

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    Area of Science:

    • Environmental Science
    • Biochemistry
    • Analytical Chemistry

    Background:

    • Human hair metal concentrations are valuable biomarkers for detecting metal intoxications and deficiencies.
    • Understanding metal binding and biochemical incorporation into hair is crucial for accurate interpretation.
    • Ambient extraction methods can influence assumptions about metal-hair interactions.

    Purpose of the Study:

    • To investigate the efficiency of ambient extraction for various metals from human scalp hair.
    • To evaluate the impact of extraction methods on understanding metal binding and biochemical incorporation.
    • To provide data for accurate mass screening and interpretation of hair metal analysis.

    Main Methods:

    • Hair samples of diverse characteristics (color, sex, age, geography) were collected and meticulously washed.

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  • A 1% nitric acid solution was used for extensive ambient extraction of metals over 21 hours.
  • Flame atomic absorption spectroscopy (FAAS) was employed for metal quantitation, with investigation of potential interferences.

    • Main Results:

    • Extraction efficiency varied significantly by metal, with 82–100% removal for Na, Mg, K, Ca, Mn, Zn, Cd, and Pb.
    • Lower extraction rates (33–54%) were observed for Fe, Ni, and Cu, indicating differential binding or incorporation.
    • The study discussed anatomical location, binding chemistry, and biochemical incorporation in relation to extraction yields.

    Conclusions:

    • Extensive ambient extraction significantly affects assumptions about metal binding and biochemical incorporation in human hair.
    • Differential extraction efficiencies highlight the complexity of metal-hair relationships.
    • Accurate interpretation of hair metal analysis requires consideration of extraction methodology and metal-specific behavior.