Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model
Аутори
Čokeša, ĐuroMarković, Mirjana
Potkonjak, Nebojša
Kaluđerović, Branka
Radmanović, Svjetlana
Šerbula, Snežana
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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 tothe 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) wereapparently 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 mostascendant interaction type in the arsenite–HA co...mplex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.
Кључне речи:
humic acid / arsenite / enthalpy / reaction coefficientИзвор:
EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings, 2023, 121-126Издавач:
- Bor : University of Belgrade, Technical Faculty in Bor
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200017 (Универзитет у Београду, Институт за нуклеарне науке Винча, Београд-Винча) (RS-MESTD-inst-2020-200017)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200116 (Универзитет у Београду, Пољопривредни факултет) (RS-MESTD-inst-2020-200116)
Колекције
Институција/група
VinčaTY - CONF AU - Čokeša, Đuro AU - Marković, Mirjana AU - Potkonjak, Nebojša AU - Kaluđerović, Branka AU - Radmanović, Svjetlana AU - Šerbula, Snežana PY - 2023 UR - https://vinar.vin.bg.ac.rs/handle/123456789/12847 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 tothe 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) wereapparently 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 mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability. PB - Bor : University of Belgrade, Technical Faculty in Bor C3 - EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings T1 - Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model SP - 121 EP - 126 UR - https://hdl.handle.net/21.15107/rcub_vinar_12847 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 tothe 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) wereapparently 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 mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.", publisher = "Bor : University of Belgrade, Technical Faculty in Bor", journal = "EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings", title = "Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model", pages = "121-126", url = "https://hdl.handle.net/21.15107/rcub_vinar_12847" }
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 EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings Bor : University of Belgrade, Technical Faculty in Bor., 121-126. https://hdl.handle.net/21.15107/rcub_vinar_12847
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 EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings. 2023;:121-126. https://hdl.handle.net/21.15107/rcub_vinar_12847 .
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 EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings (2023):121-126, https://hdl.handle.net/21.15107/rcub_vinar_12847 .