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Atmospheric deposition chemistry in a Brazilian rural area: alkaline species behavior and agricultural inputs

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Abstract

Since 2000s, several studies have been reporting an increase of alkaline species in atmospheric deposition worldwide. This study aims to evaluate and give a better understanding about atmospheric deposition chemistry collected in Lavras, a Brazilian city with rural background. Bulk atmospheric deposition samples were collected from March 2018 to February 2019 and major ionic species were quantified. The pH values ranged from 5.52 to 8.29, with an average of 5.92 and most deposition samples (~ 94%) were alkaline (pH > 5.60). For the whole sampling campaign, the ions profile in volume weighted mean (VWM) was described as follows: Ca2+ (35.02) > NH4+ (11.26) > Cl (11.19) > Mg2+ (9.04) > NO3 (8.57) > Na+ (5.65) > K+ (2.61) > SO42− (2.43) > H+ (0.94) μmol L−1. We identified Ca2+ and NH4+ as the most predominant species accounting for 53% of the total ionic species distribution. In addition, all samples showed neutralization factor (NF) index greater than 1, with mean value of 6.4. Regarding regression analysis, acidity neutralization precursors such as calcium and ammonia accounted for 50% and 4%, respectively. In addition, samples alkaline pattern was mainly due to agricultural sources, including fertilizer production and application, and cement manufacturing inside the county air basin.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study has been supported by FAPEMIG, Fundação de Amparo à Pesquisa do Estado de Minas Gerais.

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Contributions

JNP had a contributor role in (i) data curation, (ii) formal analysis, (iii) investigation, (iv) software, (v) validation, (vi) visualization, and (vii) writing. AF had a contributor role in (i) methodology, (ii) resources, and (iii) writing. MVF had a contributor role in (i) conceptualization, (ii) formal analysis, (iii) project administration, (iv) resources, (v) supervision, and (vi) writing. The contributor role was defined following the CRediT taxonomy (https://casrai.org/credit/). All authors read and approved the final manuscript.

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Correspondence to Marcelo Vieira-Filho.

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The authors declare that they have no competing interests.

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Responsible Editor: Philippe Garrigues

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Pereira, J.N., Fornaro, A. & Vieira-Filho, M. Atmospheric deposition chemistry in a Brazilian rural area: alkaline species behavior and agricultural inputs. Environ Sci Pollut Res 28, 23448–23458 (2021). https://doi.org/10.1007/s11356-020-12317-3

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  • DOI: https://doi.org/10.1007/s11356-020-12317-3

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