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Correlation of Atmospheric Dust and Rainfall as Basalt Chemical Weathering Precursors

Published online by Cambridge University Press:  16 August 2012

M. Teutli León ,
L.A. Térrez Tufiño ,
G. Jiménez Suárez ,
E. León Hernández  and
L.M. Tenorio Téllez
M. Teutli León
Affiliation:
Facultad de Ingeniería, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico. e-mail: [email protected]
L.A. Térrez Tufiño
Affiliation:
Facultad de Ingeniería, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico. e-mail: [email protected]
G. Jiménez Suárez
Affiliation:
Facultad de Ingeniería, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico. e-mail: [email protected]
E. León Hernández
Affiliation:
Facultad de Arquitectura, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, Puebla, Puebla, CP 72570, Mexico.
L.M. Tenorio Téllez
Affiliation:
Facultad de Arquitectura, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria, Puebla, Puebla, CP 72570, Mexico.
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Abstract

Basalt chemical weathering can be related to chemical composition of both atmospheric dust and rainfall, in published works authors have shown that weathered basalt exhibits a raise in anions like sulfate, nitrate, phosphate, chloride and carbonate, and doing a follow up of rainfall chemistry during 2009 at downtown Puebla, it was shown that rainfall has not an acid pH because there is a strong contribution from atmospheric dust.

In this paper it is reported obtained results for dust samples collected during the dry season, collection was done in 3 places exposed to different environment, analysis of solid samples clearly reflect anthropogenic activities since the highest oil and grease content corresponds to a site with high population, also mineral carbonate amounts 30% in weight. An analytical sample was prepared and the filtrate used to measure pH which ranges from 6.3 to 7.84, and conductivity from 11.91-13.87 mS-cm-1. Main soluble ions range are as follow: sulfate 3.4-5.9 mg g-1, nitrate 0.19-0.54 mg g-1, chloride 0.7-8.91 mg g-1, sulfide 4-7 mg g-1, carbonate 304-364 mg g-1, this last correspond to 10% of the mineral content. Also, metals were determined as total (applying an acid digestion) and water soluble, obtained results allow to affirm that there are highly soluble metals like Ca, Pb (up to 97%), moderately soluble ones such as Cu and Mn (60% and 20% respectively) and non soluble ones like Al, Fe and Zn.

It was confirmed that atmospheric dust has all properties, which could produce an alkalinization of rainwater. Also, its water soluble ionic content can be a source for those ions causing basalt weathering.

Keywords

particulatesurface chemistrychemical composition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1374: Symposium S8 – Cultural Heritage and Archaeological Issues in Materials Science , 2012 , pp. 205 - 214
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

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