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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1047-1056 (2005)
DOI: 10.2136/sssaj2004.0207
© 2005 Soil Science Society of America
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Origin of Talc, Iron Phosphates, and Other Minerals in Biosolids

W. F. Jaynes* and R. E. Zartman

Plant and Soil Science Dep., Texas Tech Univ., Lubbock, TX 79409



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  		Fig. 1. Petrographic micrographs of sand (mostly very fine sand) separated from biosolid H2O2 residues: (a) brown isotropic fiber in June 1999 biosolid residue, much of background is quartz grains; (b) colorless, isotropic glass shard and green pyroxene grain in July 1994 biosolid residue.

 


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  		Fig. 2. X-ray diffraction powder-mount patterns of silt fractions of biosolid H2O2 residues compared with silt fraction of MERCO site soil from Casby-Horton (1997): (a) June 1999; (b) July 1994; (c) August 1992; (d) Pit 4, A horizon silt.

 


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  		Fig. 3. X-ray diffraction patterns of oriented, Mg 25°C-treated clay fractions of biosolid H2O2 residues. The patterns are compared to soil clay from the MERCO site from Casby-Horton (1997): (a) June 1999; (b) July 1994; (c) August 1992; (d) Pit 4, A-horizon clay.

 


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  		Fig. 4. X-ray diffraction patterns of oriented, Mg-25°C-treated clay fractions of biosolid H2O2 residues after Ox-D extraction: (a) June 1999, (b) July 1994, and (c) August 1992.

 


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  		Fig. 5. Scanning transmission electron micrograph of July 1993 biosolid H2O2 residue clay fraction: (a) common aggregate of clay particles with Fe phosphates; (b) chemical analysis of clay aggregate.

 


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  		Fig. 6. Scanning transmission electron micrograph of July 1993 biosolid H2O2 residue clay fraction after Ox-D extraction: (a) uncommon talc particle; (b) chemical analysis of talc particle.

 




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