Composition of extractable organic matter of air particles from rural and urban Portuguese areas

Under a wheat-fallow system of farming practised on Brown, Dark Brown, and Black Chernozemic soils, on a Black Solodized Solonetz, and on Brown and Black Solods, organic C decreased by as much as 60%; the humic acid/fulvic acid ratio decreased little for the semiarid soils but up to 38% for the Black soils; ethanol/benzene-extractable organic matter increased by as much as 330%; chelating resin-extractable C increased by 27–115%; and total acidity of the extracted humic substances increased up to 36%. The ash contents of the humic substances from the Ah horizons were all less than 12%, whereas those of the Ap horizons varied between 20 and 28%. Apparent differences between the infrared spectra of the resin-extractable humic substances of the Ah and Ap horizons existed particularly near 2920 and 1550 cm−1 suggesting less aliphatic C-H and amide bonds. Anthropogenic pressures have wrought, therefore, distinct measurable qualitative changes, i.e., the general trend with cultivation was towards humic materials with a decreased proportion of side chain components, such as C-H and NH2 groups, but increased carboxyl group content.

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Genotoxic activity of extractable organic matter from urban airborne particles in Shanghai, China

Mutation Research/Genetic Toxicology and Environmental Mutagenesis ◽

10.1016/s1383-5718(01)00338-2 ◽

2002 ◽

Vol 514 (1-2) ◽

pp. 177-192 ◽

Cited By ~ 25

Author(s):

Xiansi Zhao ◽

Zhi Wan ◽

Gang Chen ◽

Huigang Zhu ◽

Shunhui Jiang ◽

...

Keyword(s):

Organic Matter ◽

Airborne Particles ◽

Genotoxic Activity ◽

Extractable Organic Matter

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Inhalable Particulate Matter and Extractable Organic Matter Receptor Source Apportionment Models for the ATEOS Urban Sites

Toxic Air Pollution ◽

10.1201/9781351077347-7 ◽

2018 ◽

pp. 195-249

Author(s):

Maria T. Morandi ◽

Joan M. Daisey ◽

Paul J. Lioy

Keyword(s):

Organic Matter ◽

Particulate Matter ◽

Source Apportionment ◽

Inhalable Particulate Matter ◽

Extractable Organic Matter ◽

Urban Sites

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Study on the distribution of extractable organic matter in pores of lacustrine shale: An example of Zhangjiatan Shale from the Upper Triassic Yanchang Formation, Ordos Basin, China

Interpretation ◽

10.1190/int-2016-0124.1 ◽

2017 ◽

Vol 5 (2) ◽

pp. SF109-SF126 ◽

Cited By ~ 7

Author(s):

Yuxi Yu ◽

Xiaorong Luo ◽

Ming Cheng ◽

Yuhong Lei ◽

Xiangzeng Wang ◽

...

Keyword(s):

Organic Matter ◽

Oil And Gas ◽

Storage Capacity ◽

Ordos Basin ◽

Organic Content ◽

Capacity Control ◽

Yanchang Formation ◽

Geochemical Characterization ◽

Extractable Organic Matter

Shale oil and gas have been discovered in the lacustrine Zhangjiatan Shale in the southern Ordos Basin, China. To study the distribution of extractable organic matter (EOM) in the Zhangjiatan Shale ([Formula: see text] ranges from 1.25% to 1.28%), geochemical characterization of core samples of different lithologies, scanning electron microscope observations, low-pressure [Formula: see text] and [Formula: see text] adsorption, and helium pycnometry were conducted. The content and saturation of the EOM in the pores were quantitatively characterized. The results show that the distribution of the EOM in the shale interval is heterogeneous. In general, the shale layers have a higher EOM content and saturation than siltstone layers. The total organic content and the original storage capacity control the EOM content in the shale layers. For the siltstone layers, the EOM content is mainly determined by the original storage capacity. On average, 75% of the EOM occurs in the mesopores, followed by 14% in the macropores, and 11% in the micropores. The EOM saturation in the pores decreases with the increase in pore diameter. The distribution of EOM in the shale pores is closely related to the pore type. Micropores and mesopores developed in the kerogens and pyrobitumens and the clay-mineral pores coated with organic matter are most favorable for EOM retention and charging.

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