The heterogeneous reactivity of gaseous nitric acid on authentic mineral dust samples, and on individual mineral and clay mineral components

2001 ◽  
Vol 3 (12) ◽  
pp. 2474-2482 ◽  
Author(s):  
Friedrich Hanisch ◽  
John N. Crowley
Keyword(s):  
Nitric Acid ◽  
Clay Mineral ◽  
Mineral Dust ◽  
Heterogeneous Reactivity ◽  
Mineral Components

A Knudsen Cell Study of the Heterogeneous Reactivity of Nitric Acid on Oxide and Mineral Dust Particles

2001 ◽  
Vol 105 (27) ◽  
pp. 6609-6620 ◽  
Author(s):  
G. M. Underwood ◽  
P. Li ◽  
H. Al-Abadleh ◽  
V. H. Grassian
Keyword(s):  
Nitric Acid ◽  
Mineral Dust ◽  
Knudsen Cell ◽  
Dust Particles ◽  
Heterogeneous Reactivity ◽  
Cell Study

Influence of parent material on clay minerals formation in Podzols of Trentino, Italy

Clay Minerals ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 699-707 ◽  
Author(s):  
A. Mirabella ◽  
M. Egli ◽  
S. Carnicelli ◽  
G. Sartori
Keyword(s):  
Organic Carbon ◽  
Clay Minerals ◽  
Clay Mineral ◽  
Parent Material ◽  
Soil Horizons ◽  
Parent Materials ◽  
Subalpine Belt ◽  
Mineral Assemblages ◽  
Mineral Components ◽  
Interstratified Mineral

AbstractThe formation of clay minerals was investigated in Spodosols developed in the subalpine belt, with similar exposure, climate and age, but deriving from different parent materials. All the soils were classified as Haplic Podzols and showed the characteristic eluviation and illuviation features of Fe, Al and organic carbon. However, varying parent material lithology led to different clay mineral assemblages in the soil. Smectite could be found in the E horizons of soils developed from granodiorite and tonalite materials. Its formation was strongly dependent on the presence of chlorite in the parent material. If nearly no other 2:1 mineral components, such as chlorite, are present in the lower soil horizons, then a residual micaceous mineral becomes the dominant clay mineral. The latter derives from a mica-vermiculite interstratified mineral.

Kinetics of the heterogeneous reaction of nitric acid with mineral dust particles: an aerosol flowtube study

2009 ◽  
Vol 11 (36) ◽  
pp. 7921 ◽  
Author(s):  
A. Vlasenko ◽  
T. Huthwelker ◽  
H. W. Gäggeler ◽  
M. Ammann
Keyword(s):  
Nitric Acid ◽  
Mineral Dust ◽  
Heterogeneous Reaction ◽  
Dust Particles ◽  
Kinetics Of

scholarly journals DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO<sub>2</sub> and NO<sub>2</sub> on mineral dust

2003 ◽  
Vol 3 (6) ◽  
pp. 2043-2051 ◽  
Author(s):  
M. Ullerstam ◽  
M. S. Johnson ◽  
R. Vogt ◽  
E. Ljungström
Keyword(s):  
Gas Phase ◽  
Loss Rate ◽  
Mineral Dust ◽  
Knudsen Cell ◽  
Heterogeneous Oxidation ◽  
Heterogeneous Reactivity ◽  
Significant Difference ◽  
Phase Loss ◽  
Diffuse Reflectance Infrared ◽  
Cell Study

Abstract. The heterogeneous oxidation of SO2 by NO2 on mineral dust was studied using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and a Knudsen cell. This made it possible to characterise, kinetically, both the formation of sulfate and nitrate as surface products and the gas phase loss of the reactive species. The gas phase loss rate was determined to be first order in both SO2 and NO2. From the DRIFTS experiment the uptake coefficient, g, for the formation of sulfate was determined to be of the order of 10-10 using the BET area as the reactive surface area. No significant formation of sulfate was seen in the absence of NO2. The Knudsen cell study gave uptake coefficients of the order of 10-6 and 10-7 for SO2 and NO2 respectively. There was no significant difference in uptake when SO2 or NO2 were introduced individually compared to experiments in which SO2 and NO2 were present at the same time.

SOME PODZOL SOILS OF ALBERTA

1960 ◽  
Vol 40 (1) ◽  
pp. 1-14 ◽  
Author(s):  
S. Pawluk
Keyword(s):  
Clay Minerals ◽  
Clay Mineral ◽  
Diffraction Data ◽  
Strong Evidence ◽  
Clay Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mineral Components ◽  
Mixed Layering ◽  
Podzol Soils

Recent exploratory surveys in the northern sections of Alberta revealed many soils morphologically similar to podzols. A laboratory study was carried out to obtain a better understanding of the genesis and morphology of these soils.Chemical analyses showed the percentage base saturation and pH to be higher than for typical podzols.Physical analyses showed slight increases in clay content in the B horizons and decreases in the A horizons when compared to the parent material.From mineralogical studies of the profiles, the following weathering sequences were established: feldspars>quartz; chlorite>biotite>muscovite; [Formula: see text]. X-ray diffraction data showed illite, montmorillonite-illite mixed layering, montmorillonite, and kaolinite as being the principal clay minerals present in the A and C horizons. The clay mineral components of the B horizons were primarily chlorite-like with lesser amounts of kaolinite. Analyses indicated that the chlorite-like mineral lacked properties attributed to well crystallized chlorites and provided strong evidence in favour of authigenic origin.Data obtained in this study showed the genesis of these soils to be somewhat different from that reported for podzols elsewhere although the process of formation evidently was primarily chemical.

scholarly journals DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO<sub>2</sub> and NO<sub>2</sub> on mineral dust

2003 ◽  
Vol 3 (4) ◽  
pp. 4069-4096
Author(s):  
M. Ullerstam ◽  
M. S. Johnson ◽  
R. Vogt ◽  
E. Ljungström
Keyword(s):  
Gas Phase ◽  
Loss Rate ◽  
Mineral Dust ◽  
Knudsen Cell ◽  
Heterogeneous Oxidation ◽  
Heterogeneous Reactivity ◽  
Significant Difference ◽  
Phase Loss ◽  
Diffuse Reflectance Infrared ◽  
Cell Study

Abstract. The heterogeneous oxidation of SO2 by NO2 on mineral dust was studied using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and a Knudsen cell. This made it possible to characterise, kinetically, both the formation of sulfate and nitrate as surface products and the gas phase loss of the reactive species. The gas phase loss rate was determined to be first order in both SO2 and NO2. From the DRIFTS experiment the uptake coefficient, γ, for the formation of sulfate was determined to be of the order of 10−10 using the BET area as the reactive surface area. No significant formation of sulfate was seen in the absence of  NO2. The Knudsen cell study gave uptake coefficients of the order of 10−6 and 10-7 for SO2 and NO2, respectively. There was no significant difference in uptake when SO2 or NO2 were introduced individually compared to experiments in which SO2 and NO2 were present at the same time.

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