ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL
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2023
Authors
Čokeša, ĐuroMarković, Mirjana
Potkonjak, Nebojša
Kaluđerović, Branka
Radmanović, Svjetlana
Šerbula, Snežana
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Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry
(ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model,
enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite–
HA binding process assuming hydrogen bonding as the dominant type of interaction in the system.
Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process.
Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading to
the formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1)
clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) were
apparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven.
Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the most
ascendant interaction type i...n the arsenite–HA complex. Thermodynamic and reaction parameters
clearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming the
possible influence of humic acids on increased As mobility, and its reduced bioavailability.
Keywords:
humic acid / arsenite / enthalpy / reaction coefficientSource:
29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia, 2023, 121-126Publisher:
- University of Belgrade, Technical Faculty in Bor
Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča) (RS-MESTD-inst-2020-200017)
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200116 (University of Belgrade, Faculty of Agriculture) (RS-MESTD-inst-2020-200116)
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Institution/Community
Poljoprivredni fakultetTY - CONF AU - Čokeša, Đuro AU - Marković, Mirjana AU - Potkonjak, Nebojša AU - Kaluđerović, Branka AU - Radmanović, Svjetlana AU - Šerbula, Snežana PY - 2023 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/6692 AB - Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry (ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model, enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite– HA binding process assuming hydrogen bonding as the dominant type of interaction in the system. Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process. Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading to the formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1) clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) were apparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven. Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the most ascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parameters clearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming the possible influence of humic acids on increased As mobility, and its reduced bioavailability. PB - University of Belgrade, Technical Faculty in Bor C3 - 29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia T1 - ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL EP - 126 SP - 121 UR - https://hdl.handle.net/21.15107/rcub_agrospace_6692 ER -
@conference{ author = "Čokeša, Đuro and Marković, Mirjana and Potkonjak, Nebojša and Kaluđerović, Branka and Radmanović, Svjetlana and Šerbula, Snežana", year = "2023", abstract = "Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry (ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model, enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite– HA binding process assuming hydrogen bonding as the dominant type of interaction in the system. Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process. Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading to the formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1) clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) were apparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven. Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the most ascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parameters clearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming the possible influence of humic acids on increased As mobility, and its reduced bioavailability.", publisher = "University of Belgrade, Technical Faculty in Bor", journal = "29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia", title = "ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL", pages = "126-121", url = "https://hdl.handle.net/21.15107/rcub_agrospace_6692" }
Čokeša, Đ., Marković, M., Potkonjak, N., Kaluđerović, B., Radmanović, S.,& Šerbula, S.. (2023). ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL. in 29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia University of Belgrade, Technical Faculty in Bor., 121-126. https://hdl.handle.net/21.15107/rcub_agrospace_6692
Čokeša Đ, Marković M, Potkonjak N, Kaluđerović B, Radmanović S, Šerbula S. ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL. in 29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia. 2023;:121-126. https://hdl.handle.net/21.15107/rcub_agrospace_6692 .
Čokeša, Đuro, Marković, Mirjana, Potkonjak, Nebojša, Kaluđerović, Branka, Radmanović, Svjetlana, Šerbula, Snežana, "ARSENITE–SOIL HUMIC ACID BINDING BY ISOTHERMAL TITRATION CALORIMETRY: THERMODYNAMICS AND MNIS MODEL" in 29th INTERNATIONAL CONFERENCE ECOLOGICAL TRUTH AND ENVIRONMENTAL RESEARCH – EcoTER’22, Sokobanja, Serbia (2023):121-126, https://hdl.handle.net/21.15107/rcub_agrospace_6692 .