User profiles for K. Spokas

Kurt Spokas

Scientist USDA-ARS
Verified email at ars.usda.gov
Cited by 18388

Biochar: a synthesis of its agronomic impact beyond carbon sequestration

KA Spokas, KB Cantrell, JM Novak… - Journal of …, 2012 - Wiley Online Library
Biochar has been heralded as an amendment to revitalize degraded soils, improve soil
carbon sequestration, increase agronomic productivity, and enter into future carbon trading …

[HTML][HTML] Feedstock choice, pyrolysis temperature and type influence biochar characteristics: a comprehensive meta-data analysis review

…, ML Cayuela, G Sigua, J Novak, K Spokas… - Biochar, 2020 - Springer
… ) and low O/C and H/C ratios (Spokas 2010) should be applied to soils. Grass-based
feedstocks contained relatively elevated K and Ca content as compared to other feedstocks, while …

Characteristics and applications of biochar for environmental remediation: a review

…, C Wang, E Yargicoglu, K Spokas - Critical Reviews in …, 2015 - Taylor & Francis
… and celluloses occurring first (at temperatures of 470–530 K and 510–620 K, respectively)
and lignin last (between 550 and 770 K). Due to variations in lignin and recalcitrant carbon …

Review of the stability of biochar in soils: predictability of O: C molar ratios

KA Spokas - Carbon management, 2010 - Taylor & Francis
Biochar is not a structured homogeneous material; rather it possesses a range of chemical
structures and a heterogeneous elemental composition. This variability is based on the …

Impacts of woodchip biochar additions on greenhouse gas production and sorption/degradation of two herbicides in a Minnesota soil

KA Spokas, WC Koskinen, JM Baker, DC Reicosky - Chemosphere, 2009 - Elsevier
… , as K oc values exhibited a trend opposite to that using K f values. Atrazine and acetochlor
K … Comparison of the K oc values to K f values for atrazine and acetochlor indicates that, on a …

Methane mass balance at three landfill sites: What is the efficiency of capture by gas collection systems?

K Spokas, J Bogner, JP Chanton, M Morcet, C Aran… - Waste management, 2006 - Elsevier
Many developed countries have targeted landfill methane recovery among greenhouse gas
mitigation strategies, since methane is the second most important greenhouse gas after …

[PDF][PDF] Impacts of sixteen different biochars on soil greenhouse gas production.

KA Spokas, DC Reicosky - Annals of environmental science, 2009 - Citeseer
One potential abatement strategy to increasing atmospheric levels of carbon dioxide (CO2)
is to sequester atmospheric CO2 captured through photosynthesis in biomass and pyrolysed …

Qualitative analysis of volatile organic compounds on biochar

KA Spokas, JM Novak, CE Stewart, KB Cantrell… - Chemosphere, 2011 - Elsevier
Qualitative identification of sorbed volatile organic compounds (VOCs) on biochar was
conducted by headspace thermal desorption coupled to capillary gas chromatographic-mass …

Microbial methane oxidation processes and technologies for mitigation of landfill gas emissions

…, HA Hilger, M Huber-Humer, K Spokas - Waste management …, 2009 - journals.sagepub.com
Landfill gas containing methane is produced by anaerobic degradation of organic waste.
Methane is a strong greenhouse gas and landfills are one of the major anthropogenic sources …

Physical and chemical characterization of waste wood derived biochars

EN Yargicoglu, BY Sadasivam, KR Reddy, K Spokas - Waste management, 2015 - Elsevier
… For each biochar, 3 different constant head levels were used and the results averaged to
determine the hydraulic conductivity (k) of the material. Deionized water was used during the …