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Systematic changes of bone hydroxyapatite along a charring temperature gradient: An integrative study with

Partha Pratim Biswas1, Biqing Liang1, Gordon Turner-Walker2

  • 1Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan.

The Science of the Total Environment
|October 19, 2020
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Summary

Bone char produced at lower temperatures is a valuable phosphorus source for soil fertility. Higher charring temperatures enhance stability and resistance to acidic dissolution, making bone char a promising fertilizer and liming agent.

Keywords:
Bone charBone hydroxyapatite (HAp)Carbonated hydroxyapatite (CHAp)Mineral transformationPhosphorus dissolutionSoil fertility

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Area of Science:

  • Materials Science
  • Environmental Science
  • Soil Science

Background:

  • Bone char is a potential long-term phosphorus nutrient source.
  • Understanding its mineral transformation and dissolution is crucial for its application.

Purpose of the Study:

  • To assess bone char's applicability as a phosphorus nutrient source.
  • To investigate the effects of charring temperature on bone char properties and dissolution.

Main Methods:

  • Synchrotron-based techniques (FTIR, XRD, TXM) were used to analyze bone and bone char physicochemical changes.
  • Lab incubation experiments studied bone char dissolution behavior across a range of pH levels.

Main Results:

  • Increasing charring temperatures caused mineral transformation and increased stability.
  • Bone char exhibited enhanced pH buffering capacity and resistance to acidic dissolution at higher temperatures.
  • Bone char produced at 500°C showed high pH buffering, while 700°C char acted as a liming agent.

Conclusions:

  • Bone char produced at low to intermediate temperatures is a viable phosphorus source for soil fertility.
  • Charring temperature significantly influences bone char's chemical properties and dissolution behavior.
  • This study provides a scientific basis for utilizing bone char as a P-fertilizer and soil amendment.