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Evaluating the Effect of Hydrofluoric Acid Etching on Quartz Grains using Microscope Image Analysis, Laser Diffraction and Weight Loss Particle Size Estimate

Grzegorz Poręba
Grzegorz Poręba
, 
Konrad Tudyka
Konrad Tudyka
, 
Agnieszka Szymak
Agnieszka Szymak
, 
Julia Pluta
Julia Pluta
, 
Joanna Rocznik
Joanna Rocznik
, 
Jakub Świątkowski
Jakub Świątkowski
, 
Rafał Osadnik
Rafał Osadnik
 e 
Piotr Moska
Piotr Moska
   | 10 mag 2022
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Pubblicato online: 10 mag 2022
Pagine: 1 - 8
Ricevuto: 13 mag 2021
Accettato: 24 gen 2022
DOI: https://doi.org/10.2478/geochr-2022-0001
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© 2022 Grzegorz Poręba et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Location of the sampling site (A) and material collection from an active sand pit (B).
Location of the sampling site (A) and material collection from an active sand pit (B).

Fig. 2

Random grains before (A) and after 40% HF etching for 60 min (B) and 180 min (C). Note smaller grains ranging from ca. 5 μm up to 100 μm detected after etching (B and C), marked with an arrow.
Random grains before (A) and after 40% HF etching for 60 min (B) and 180 min (C). Note smaller grains ranging from ca. 5 μm up to 100 μm detected after etching (B and C), marked with an arrow.

Fig. 3

Random grains before (A) and after 40% HF etching for 60 min (B) and 180 min (C). Note smaller grains ranging from ca. 5 μm up to 100 μm detected after etching (B and C), marked with an arrow. The microscope IA algorithm marks different grains with different colours and draws rectangles for visual validation.
Random grains before (A) and after 40% HF etching for 60 min (B) and 180 min (C). Note smaller grains ranging from ca. 5 μm up to 100 μm detected after etching (B and C), marked with an arrow. The microscope IA algorithm marks different grains with different colours and draws rectangles for visual validation.

Fig. 4

Laser volumetric grain size distributions (A) and grain size distributions (B). Microscope IA with volumetric grain size distributions (C) and grain size distributions (D). IA, Image analysis.
Laser volumetric grain size distributions (A) and grain size distributions (B). Microscope IA with volumetric grain size distributions (C) and grain size distributions (D). IA, Image analysis.

Fig. 5

Roundness distribution of quartz grains etched with 40% HF acid for microscope IA. Roundness is defined as 4πA/P2, where A is the area and P is the perimeter. IA, Image analysis..
Roundness distribution of quartz grains etched with 40% HF acid for microscope IA. Roundness is defined as 4πA/P2, where A is the area and P is the perimeter. IA, Image analysis..

Fig. 6

Roundness and equivalent diameter of quartz grains etched with 40% HF acid for microscope IA. Roundness is defined as 4πA/P2, where A is the area and P is the perimeter. IA, Image analysis.
Roundness and equivalent diameter of quartz grains etched with 40% HF acid for microscope IA. Roundness is defined as 4πA/P2, where A is the area and P is the perimeter. IA, Image analysis.

Fig. 7

Mass etching depth (δrm) vs. etching time (t) assessed from mass loss calculations. LD 1/2ΔDV, LD, 50 and microscope IA 1/2ΔDV, LD, 50 equivalent radius changes. Light blue and red areas correspond to LD 1/2ΔDV, LD, 10 – 1/2ΔDV, LD, 90 and microscope IA 1/2ΔD, IA, 10 – 1/2ΔDV, IA, 90 ranges. LD, Laser diffraction.
Mass etching depth (δrm) vs. etching time (t) assessed from mass loss calculations. LD 1/2ΔDV, LD, 50 and microscope IA 1/2ΔDV, LD, 50 equivalent radius changes. Light blue and red areas correspond to LD 1/2ΔDV, LD, 10 – 1/2ΔDV, LD, 90 and microscope IA 1/2ΔD, IA, 10 – 1/2ΔDV, IA, 90 ranges. LD, Laser diffraction.

Initial and final mass loss of etched quartz grains and estimated etched depth of the grains.

Time (min) Batch A Batch B Mean etching depth (μm)
Initial mass (g) Final mass (g) Initial mass (g) Final mass (g)
0* 3.5739 3.5661 3.5033 3.4977 0 ± N/A
30 3.5513 2.9595 3.5981 3.0251 5.1 ± 0.3
45 3.5161 2.7271 3.5524 2.7978 7.0 ± 0.4
60 3.5400 2.5144 3.5099 2.5116 9.5 ± 0.5
90 3.6021 2.2142 3.4692 2.0754 13.8 ± 0.8
120 3.5805 1.8717 3.4540 1.7820 17.6 ± 1.0
150 3.5299 1.5243 3.4676 1.5269 21.7 ± 1.2
180 3.4273 1.2808 3.5608 1.2963 25.2 ± 1.4
eISSN:
1897-1695
Lingua:
Inglese
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