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Phosphates, phosphites, and phosphides in environmental samples.

Siyuan C Morton1, Dietmar Glindemann, Marc A Edwards

  • 1Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University, 407 Durham Hall, Mail Code 0246, Blacksburg, Virginia 24061-0246, USA.

Environmental Science & Technology
|April 12, 2003
PubMed
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Reduced phosphorus compounds, not just phosphates, exist in the environment. Standard tests misclassify these compounds, impacting environmental phosphorus analysis and understanding.

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Geochemistry

Background:

  • The prevailing assumption is that phosphorus exists solely as phosphate in environmental samples.
  • Standard analytical methods may misclassify phosphorus compounds, particularly reduced forms.
  • Reduced phosphorus compounds can significantly impact environmental assessments.

Purpose of the Study:

  • To investigate the presence and detection of reduced phosphorus compounds in environmental samples.
  • To evaluate the accuracy of standard phosphorus determination methods when reduced phosphorus is present.
  • To understand the behavior and stability of hydrogen phosphide (PH3) in various solution compositions.

Main Methods:

  • Analysis of phosphorus compounds using standard determination techniques.

Related Experiment Videos

  • Investigation of hydrogen phosphide (PH3) evolution and stability under different chemical conditions.
  • Assessment of reduced phosphorus leaching from cast iron and its presence in rust.

    • Main Results:

    • Standard phosphorus determination methods incorrectly classify reduced phosphorus compounds, often as organic P.
    • The stability and removal of hydrogen phosphide (PH3) are influenced by solution composition, including acids and metals.
    • Existing extraction methods fail to detect significant amounts of reduced phosphorus, especially recalcitrant iron phosphides.
    • Reduced phosphorus compounds were found to leach from cast iron into water and are present in metal scale (rust).

    Conclusions:

    • The assumption of phosphorus existing exclusively as phosphate requires re-evaluation.
    • Analytical challenges exist in accurately quantifying reduced phosphorus compounds in environmental matrices.
    • Reduced phosphorus represents a potentially overlooked component in environmental phosphorus cycling and metal corrosion processes.