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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

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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


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS611-38 µm


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS611-PM10


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS611-PM 2.5


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS667-µm


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS667-PM10


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS646-38µm


Measurement of carbonate minerals in aerosol samples a preliminary study

X-ray Diffraction (XRD) Scan

RS646-PM10


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]


Measurement of carbonate minerals in aerosol samples a preliminary study

Chemical vs Mineralogical Ratios


Measurement of carbonate minerals in aerosol samples a preliminary study

Chemical vs Mineralogical Ratios


Measurement of carbonate minerals in aerosol samples a preliminary study

Soluble Ca vs Total Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

Carbonate vs Soluble Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

OC4 vs Soluble Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

Carbonate vs Total Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

OC3 vs Total Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

OC4 vs Total Ca


Measurement of carbonate minerals in aerosol samples a preliminary study

OC4 vs Carbonate


Measurement of carbonate minerals in aerosol samples a preliminary study

Chemical vs Mineralogical Ratios


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


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