Results 21 to 30 of about 93,276 (264)

Seasonal variations in the concentration and solubility of elements in atmospheric particulate matter: a case study in Northern Italy

E3S Web of Conferences, 2013
Atmospheric particulate matter is characterized by a variety of chemical components, generally produced by different sources. Chemical fractionation of elements, namely the determination of their extractable and residual fractions, may reliably increase ...
Canepari S., Astolfi M. L., Marcovecchio F., Maretto M., Perrino C.   +4 more
doaj   +1 more source

Phosphorus concentrations in sediments from the equatorial Amazon estuary, Furo of Muriá, Pará State, Brazil

Acta Scientiarum: Technology, 2022
We characterized the spatial and seasonal distributions of different phosphorus fractions in surface sediments from the Furo of Muriá estuary by chemical fractionation.
Ana Carolina Santa Rosa de Sousa, Rosa Maria da Luz Mendes, Francianne Vieira Mourão, Maamar El Robrini, José Almir Rodrigues Pereira, Pedro Henrique Campos Sousa, Maria Lourdes de Souza Santos   +6 more
doaj   +1 more source

Influence of Cropping Regimes on the Availability and Existing Forms of Phosphorus in the Albic Luvisols in Northeast China

Agronomy
Adopting an optimal cropping regime is crucial for sustainable soil use. However, how different cropping regimes impact phosphorus (P) availability and the underlying mechanism remain unclear. Here, a 10-year field experiment was performed to examine the
Yidan Geng, Honghao Yu, Yuanhong Sun, Zhiyuan Cao, Siyu Li, Hang Liu, Cuilan Li, Jinjing Zhang   +7 more
doaj   +1 more source

Structure II gas hydrates found below the bottom‐simulating reflector

Geophysical Research Letters, 2016
Gas hydrates are a major component in the organic carbon cycle. Their stability is controlled by temperature, pressure, water chemistry, and gas composition.
M. Paganoni, J. A. Cartwright, M. Foschi, R. C. Shipp, P. Van Rensbergen   +4 more
doaj   +1 more source

A biomimetic peptide has no effect on the isotopic fractionation during in vitro silica precipitation

Scientific Reports, 2021
The stable isotopic composition of diatom silica is used as a proxy for nutrient utilisation in natural waters. This approach provides essential insight into the current and historic links between biological production, carbon cycling and climate ...
Lucie Cassarino, Paul Curnow, Katharine R. Hendry   +2 more
doaj   +1 more source

Chemical fractionation in the silicate vapor atmosphere of the Earth [PDF]

Earth and Planetary Science Letters, 2011
48 pages, 6 figures, 2 ...
Pahlevan, Kaveh, Stevenson, David J., Eiler, John M.   +2 more
openaire   +3 more sources

The Organic Matter of Chernozem

Бюллетень Почвенного института им. В.В. Докучаева, 2017
Theories and points of view of soil science classics, such as V. V. Dokuchaev, I. V. Turin and M. M. Kononva on chernozem organic matter are reviewed in this work.
B. M. Kogut
doaj   +1 more source

Fractional model of the chemical inductor

Chaos, Solitons & Fractals, 2023
This work was supported by Universidad Rey Juan Carlos, project number M2993.
openaire   +2 more sources

NOVEL STUDY FOR CHEMICAL COMPOSITION OF AL-AHDAB CRUDE OIL [PDF]

مجلة جامعة الانبار للعلوم الصرفة, 2017
Thisn research included determination of chemical composition of al-ahdaab crude oil (kute- Iraq) using liquid – solid chromatography. The current researched included to separation the component of crude oil by column chromatography was packing with ...
Tariq A. Al-Ani, Mohsin O. Mohammed, Abrahim H. Farhan   +2 more
doaj   +1 more source

Peroxyacetic Acid Pretreatment: A Potentially Promising Strategy towards Lignocellulose Biorefinery

Molecules, 2022
The stubborn and complex structure of lignocellulose hinders the valorization of each component of cellulose, hemicellulose, and lignin in the biorefinery industries.
Mingyang Hu, Junyou Chen, Yanyan Yu, Yun Liu   +3 more
doaj   +1 more source