Measurement of carbonate minerals in aerosol samples a preliminary study
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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) Preliminary Study

  • XRD measures the presence and concentration of crystalline compounds (phases) such as minerals

  • It does not record chemical concentrations


X-ray Diffraction (XRD) Scan Preliminary Study

RS611-38 µm


X-ray Diffraction (XRD) Scan Preliminary Study

RS611-PM10


X-ray Diffraction (XRD) Scan Preliminary Study

RS611-PM 2.5


X-ray Diffraction (XRD) Scan Preliminary Study

RS667-µm


X-ray Diffraction (XRD) Scan Preliminary Study

RS667-PM10


X-ray Diffraction (XRD) Scan Preliminary Study

RS646-38µm


X-ray Diffraction (XRD) Scan Preliminary Study

RS646-PM10


Minerals identified in 20 re suspended aerosol filter samples
Minerals Identified in 20 Preliminary StudyRe-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 Preliminary Study Re-suspended Aerosol Filter Samples

  • Feldspar Minerals

    • Anorthite

    • Microcline

  • Oxides

    • Rutile

  • Gypsum [CaSO4.2H2O]


Chemical Preliminary Studyvs Mineralogical Ratios


Chemical Preliminary Studyvs Mineralogical Ratios


Soluble Ca Preliminary Study vs Total Ca


Carbonate Preliminary Studyvs Soluble Ca


OC4 Preliminary Studyvs Soluble Ca


Carbonate Preliminary Studyvs Total Ca


OC3 Preliminary Studyvs Total Ca


OC4 Preliminary Studyvs Total Ca


OC4 Preliminary Studyvs Carbonate


Chemical Preliminary Studyvs Mineralogical Ratios


Mineralogical reactions
Mineralogical Reactions Preliminary Study

CaCO3 + SiO2 = CaSiO2 + CO2

calcite + quartz wollastonite

490 – 550 oC


Mineralogical reactions1
Mineralogical Reactions Preliminary Study

CaMg(CO3)2 + 4SiO2 + H20 =

dolomite + quartz + water

Mg3SiO4O10(OH)2 + 3CaCO3 + CO2

talc + calcite

150 – 250 oC


Question
Question Preliminary Study

  • With the current TOR method, are we quantitatively measuring all the carbonate in the aerosol samples?


Conclusions
Conclusions Preliminary Study

  • 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


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