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Single-element and competitive metal mobility measured with column infiltration and batch tests.

Vasileios Antoniadis1, John D McKinley, Wan Y W Zuhairi

  • 1Dep. of Agricultural Development, Democritus Univ. of Thrace, Pantazidou 193, GR-682 00, Orestiada, Greece. vasilisrev@yahoo.com

Journal of Environmental Quality
|January 12, 2007
PubMed
Summary

Centrifuge infiltration tests provide reliable heavy metal mobility (Kd) values in clays. Competitive sorption increases mobility more for weakly bound metals like Nickel and Zinc than for strongly bound Copper.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Geochemistry

Background:

  • Heavy metal mobility in soils is crucial for environmental risk assessment.
  • The distribution coefficient (Kd) is a key parameter for quantifying metal mobility.
  • Traditional methods for measuring Kd, like batch sorption and column infiltration, have limitations, especially in clay soils.

Purpose of the Study:

  • To evaluate the effectiveness of centrifuge infiltration tests for measuring heavy metal mobility in clay.
  • To compare Kd values obtained from centrifuge infiltration tests with those from batch sorption tests.
  • To investigate the impact of competitive sorption on the mobility of copper (Cu), nickel (Ni), and zinc (Zn) in London Clay.

Main Methods:

  • Utilized centrifuge infiltration tests at 2600 gravities on London Clay columns.
  • Measured mobility of Cu, Ni, and Zn as single elements and in dual competition.
  • Determined single-element Kd values using conventional batch sorption tests for comparison.

Main Results:

  • Batch sorption Kd values varied significantly with metal concentration, while centrifuge tests yielded a single Kd value per metal.
  • Centrifuge infiltration Kd values were generally lower than batch test Kd values.
  • The order of mobility for all tests was Ni > Zn > Cu.
  • Competitive sorption increased metal mobility, with Ni and Zn showing greater increases than Cu.

Conclusions:

  • Centrifuge infiltration is a viable method for assessing heavy metal mobility in clay soils, overcoming limitations of traditional column tests.
  • Competitive sorption dynamics significantly influence heavy metal mobility, affecting less strongly bound metals more profoundly.
  • Understanding competitive sorption is essential for accurate environmental risk assessment of heavy metal contamination in soils.