Optical properties of humic-like substances
نویسندگان
چکیده
Optical properties of humic-like substances (HULIS) in biomass-burning aerosols A. Hoffer, A. Gelencsér, P. Guyon, G. Kiss, O. Schmid, G. Frank, P. Artaxo, and M. O. Andreae Max Planck Institute for Chemistry, Department of Biogeochemistry, Mainz, Germany Air Chemistry Group of the Hungarian Academy of Sciences, Veszprém, Hungary Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, Brazil Received: 1 July 2005 – Accepted: 28 July 2005 – Published: 23 August 2005 Correspondence to: A. Hoffer ([email protected]) © 2005 Author(s). This work is licensed under a Creative Commons License.
منابع مشابه
The density of humic acids and humic like substances (HULIS) from fresh and aged wood burning and pollution aerosol particles
Atmospheric aerosols play significant roles in climatic related phenomena. Size, density and shape of particles affect their fluid-dynamic parameters which in turn dictate their transport and lifecycle. Moreover, density and shape are also related to particles’ optical properties, influencing their regional and global radiative effects. In the present study we have measured and compared the eff...
متن کاملPhotooxidation-induced changes in optical, electrochemical, and photochemical properties of humic substances.
Two aquatic fulvic acids and one soil humic acid were irradiated to examine the resulting changes in the redox and photochemical properties of the humic substances (HS), the relationship between these changes, and their relationship to changes in the optical properties. For all HS, irradiation caused photooxidation, as shown by decreasing electron donating capacities. Photooxidation was accompa...
متن کاملThe role of humic substances in mitigating the harmful effects of soil salinity and improve plant productivity
The environmental, social and economical reasons indicate that the conventional agriculture constitute a continuous pressure contributing to the progressive worsening of environmental conditions, especially by an increasing apply high level of inputs. In this matter, the increasing use of saline irrigation water is one of the main factors resulting in salt accumulation in the plant rhizosp...
متن کاملNatural carbon-based dots from humic substances
For the first time, abundant natural carbon-based dots were found and studied in humic substances (HS). Four soluble HS including three humic acids (HA) from different sources and one fulvic acids (FA) were synthetically studied. Investigation results indicate that all the four HS contain large quantities of Carbon-based dots. Carbon-based dots are mainly small-sized graphene oxide nano-sheets ...
متن کاملAtmospheric HULIS: How humic-like are they? A comprehensive and critical review
A class of organic molecules extracted from atmospheric aerosol particles and isolated from fog and cloud water has been termed HUmic-LIke Substances (HULIS) due to a certain resemblance to terrestrial and aquatic humic and fulvic acids. In light of the interest that this class of atmospheric compounds currently attracts, we comprehensively review HULIS properties, as well as laboratory and fie...
متن کامل