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פותח על ידי קלירמאש פתרונות בע"מ -
Methodological limitations to determining acidic groups at biochar surfaces via the Boehm titration
Year:
2014
Source of publication :
Carbon
Authors :
גרבר, אלן
;
.
צ'חנסקי, לודמילה
;
.
Volume :
66
Co-Authors:
Tsechansky, L., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Facilitators :
From page:
730
To page:
733
(
Total pages:
4
)
Abstract:
The Boehm titration is frequently employed to characterize acidic groups at biochar surfaces. However, biochars contain inorganic basic components (carbonates, oxides, hydroxides), inorganic acidic species (silica, alumina) and organic acids (carboxylic acids, phenols, humic-like substances) that can be differentially solubilized in the Boehm bases, rendering invalid results. This is demonstrated for two biochars. Prior to titrations (Boehm or continuous), biochar should be pretreated with NaOH to remove solubilizable acidic species, and then with HCl to remove solubilizable basic components and protonate carbon acid sites. Pretreatment is successful when direct and indirect titrations yield identical results and no precipitate is observed. © 2013 Elsevier Ltd. All rights reserved.
Note:
Related Files :
Acidic groups
Alumina
Bio chars
Boehm titration
Carbon acid
Humic-like substances
Pre-Treatment
soil
Titration
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.carbon.2013.09.044
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20671
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:38
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Scientific Publication
Methodological limitations to determining acidic groups at biochar surfaces via the Boehm titration
66
Tsechansky, L., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Graber, E.R., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Methodological limitations to determining acidic groups at biochar surfaces via the Boehm titration
The Boehm titration is frequently employed to characterize acidic groups at biochar surfaces. However, biochars contain inorganic basic components (carbonates, oxides, hydroxides), inorganic acidic species (silica, alumina) and organic acids (carboxylic acids, phenols, humic-like substances) that can be differentially solubilized in the Boehm bases, rendering invalid results. This is demonstrated for two biochars. Prior to titrations (Boehm or continuous), biochar should be pretreated with NaOH to remove solubilizable acidic species, and then with HCl to remove solubilizable basic components and protonate carbon acid sites. Pretreatment is successful when direct and indirect titrations yield identical results and no precipitate is observed. © 2013 Elsevier Ltd. All rights reserved.
Scientific Publication
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