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Measurement of Carbonate Minerals in Aerosol Samples- A Preliminary Study. Johann Engelbrecht Desert Research Institute. X-ray Diffraction (XRD). XRD measures the presence and concentration of crystalline compounds (phases) such as minerals It does not record chemical concentrations.

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measurement of carbonate minerals in aerosol samples a preliminary study

Measurement of Carbonate Minerals in Aerosol Samples- A Preliminary Study

Johann Engelbrecht

Desert Research Institute

x ray diffraction xrd
X-ray Diffraction (XRD)
  • XRD measures the presence and concentration of crystalline compounds (phases) such as minerals
  • It does not record chemical concentrations
minerals identified in 20 re suspended aerosol filter samples
Minerals Identified in 20Re-suspended Aerosol Filter Samples
  • Quartz [SiO2] (common)
  • Carbonate Minerals
    • Calcite [CaCO3]
    • Aragonite [CaCO3]
    • Dolomite [CaMg(CO3)2]
  • Layered Silicates
    • Micas such as Muscovite
    • Vermiculite
    • Clays such as Dickite, Kaolinite & Montmorillonite
    • Chlorite
minerals identified in 20 re suspended aerosol filter samples1
Minerals Identified in 20 Re-suspended Aerosol Filter Samples
  • Feldspar Minerals
    • Anorthite
    • Microcline
  • Oxides
    • Rutile
  • Gypsum [CaSO4.2H2O]
mineralogical reactions
Mineralogical Reactions

CaCO3 + SiO2 = CaSiO2 + CO2

calcite + quartz wollastonite

490 – 550 oC

mineralogical reactions1
Mineralogical Reactions

CaMg(CO3)2 + 4SiO2 + H20 =

dolomite + quartz + water

Mg3SiO4O10(OH)2 + 3CaCO3 + CO2

talc + calcite

150 – 250 oC

question
Question
  • With the current TOR method, are we quantitatively measuring all the carbonate in the aerosol samples?
conclusions
Conclusions
  • Minerals can play an important role in aerosol samples which contain a significant amount of soil dust
  • XRD is an appropriate analytical tool for identifying & quantifying minerals on filter samples, but does require research
  • The TOR method for the measurement of mineral carbonate should be reviewed