Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

104695 A Simple, Simultaneous Gravimetric Determination of Calcite and Dolomite in Calcareous Soils.

Poster Number 919

See more from this Division: SSSA Division: Nutrient Management and Soil and Plant Analysis
See more from this Session: Nutrient Management and Soil and Plant Analysis General Poster

Monday, October 23, 2017
Tampa Convention Center, East Exhibit Hall

Juan Rodriguez, USDA-ARS, Auburn, AL
Poster Presentation
  • Poster Preparation for Tampa FL (pdf better for uploading)10 04 2017.pdf (97.2 kB)
  • Abstract:

     

                 Literature pertaining to determination of calcite and dolomite is not modern, in general describes slow methods that require expensive specialized apparatus.  The objective of this paper is to describe a new method that requires no specialized equipment.  The separation of calcite and dolomite was done placing 0.2000 ± 0.0200 g. of calcareous soil, 6-mL glass vial with 4.0 mL of 4 mol L-1 HCl-3% FeCl2 .4H2O in a 50-mL Erlenmeyer flask.  The Erlenmeyer was capped with the tubed rubber stopper and the carbonate meter (CM) initial weight recorded to the accuracy of 4 decimals.  A second weight was recorded after 30 s of reaction, a third weight was recorded after 30 min of reaction, and the last weight was taken after 22-24h.  Linear regressions and correlation coefficients for calcite and dolomite in calcite-dolomite-soil mixtures, with the modified carbonate meter (MCM) calcite and dolomite results were excellent.  Precision for calcite was <5% in 92.6% of samples, precision for dolomite was <10% in 98.8% of samples.  Recovery for calcite was 100 ± 10% in 86.4% of samples, recovery for dolomite was 100 ± 10% in 97.5% of samples.  The MCM technique efficiently separated calcite and dolomite in calcareous soils.  This procedure is recommended for routine analysis of calcite and dolomite concentrations up to 450 g kg-1.  The MCM is easy to follow with good precision and recovery.

     

     

    See more from this Division: SSSA Division: Nutrient Management and Soil and Plant Analysis
    See more from this Session: Nutrient Management and Soil and Plant Analysis General Poster