Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste
Апстракт
Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca-5(AsO4)(3)OH have been proposed. These immobilization techniques are successfully applied in treatment of industrial waste containing As. Quite the contrary, treatment of soil contaminated with As by apatite amendments, instead of immobilization of this toxic element, increases its mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, the stability analysis of different calcium arsenates: Ca-5(AsO4)(3)OH, Ca-4(AsO4)(2)(OH)(2), Ca-3(AsO4)(2) Ca5H2(AsO4)(2) and CaHASO(4) was performed, which is based on the calculation of the ion-ion interaction potential (IIIP). It has been demonstrated earlier that HIP, representing the main term of the cohesive energy, is a suitable parameter for assessment of mineral stability. According to the results of this analysis, arsenate apatite with II...IP value of -0.578 Ry represents the most stable chemical form among analyzed compounds. Based on this finding, we proposed a mechanism of formation of arsenate apatite in the presence of hydroxyapatite. This mechanism can explain the suitability of this approach for the treatment of industrial waste and its limitations for in situ treatment of soil and water contaminated with As.
Кључне речи:
arsenate apatite / calcium arsenates / cohesive energy / stability / wasteИзвор:
Materials Science Forum, 2007, 555, 131-+Финансирање / пројекти:
- Ministry of Science and Environmental Protection of the Republic of Serbia [142050]
Напомена:
- Research Trends in Contemporary Materials Science, 8th Conference of the Yugoslav-Materials-Research-Society (Yu-MRS), Sep 04-08, 2006, Herceg Novi, Montenegro
Колекције
Институција/група
VinčaTY - CONF AU - Raičević, Slavica AU - Stanić, Vojislav AU - Kaluđerović-Radoičić, Tatjana PY - 2007 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6679 AB - Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca-5(AsO4)(3)OH have been proposed. These immobilization techniques are successfully applied in treatment of industrial waste containing As. Quite the contrary, treatment of soil contaminated with As by apatite amendments, instead of immobilization of this toxic element, increases its mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, the stability analysis of different calcium arsenates: Ca-5(AsO4)(3)OH, Ca-4(AsO4)(2)(OH)(2), Ca-3(AsO4)(2) Ca5H2(AsO4)(2) and CaHASO(4) was performed, which is based on the calculation of the ion-ion interaction potential (IIIP). It has been demonstrated earlier that HIP, representing the main term of the cohesive energy, is a suitable parameter for assessment of mineral stability. According to the results of this analysis, arsenate apatite with IIIP value of -0.578 Ry represents the most stable chemical form among analyzed compounds. Based on this finding, we proposed a mechanism of formation of arsenate apatite in the presence of hydroxyapatite. This mechanism can explain the suitability of this approach for the treatment of industrial waste and its limitations for in situ treatment of soil and water contaminated with As. C3 - Materials Science Forum T1 - Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste VL - 555 SP - 131 EP - + UR - https://hdl.handle.net/21.15107/rcub_vinar_6679 ER -
@conference{ author = "Raičević, Slavica and Stanić, Vojislav and Kaluđerović-Radoičić, Tatjana", year = "2007", abstract = "Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca-5(AsO4)(3)OH have been proposed. These immobilization techniques are successfully applied in treatment of industrial waste containing As. Quite the contrary, treatment of soil contaminated with As by apatite amendments, instead of immobilization of this toxic element, increases its mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, the stability analysis of different calcium arsenates: Ca-5(AsO4)(3)OH, Ca-4(AsO4)(2)(OH)(2), Ca-3(AsO4)(2) Ca5H2(AsO4)(2) and CaHASO(4) was performed, which is based on the calculation of the ion-ion interaction potential (IIIP). It has been demonstrated earlier that HIP, representing the main term of the cohesive energy, is a suitable parameter for assessment of mineral stability. According to the results of this analysis, arsenate apatite with IIIP value of -0.578 Ry represents the most stable chemical form among analyzed compounds. Based on this finding, we proposed a mechanism of formation of arsenate apatite in the presence of hydroxyapatite. This mechanism can explain the suitability of this approach for the treatment of industrial waste and its limitations for in situ treatment of soil and water contaminated with As.", journal = "Materials Science Forum", title = "Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste", volume = "555", pages = "131-+", url = "https://hdl.handle.net/21.15107/rcub_vinar_6679" }
Raičević, S., Stanić, V.,& Kaluđerović-Radoičić, T.. (2007). Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste. in Materials Science Forum, 555, 131-+. https://hdl.handle.net/21.15107/rcub_vinar_6679
Raičević S, Stanić V, Kaluđerović-Radoičić T. Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste. in Materials Science Forum. 2007;555:131-+. https://hdl.handle.net/21.15107/rcub_vinar_6679 .
Raičević, Slavica, Stanić, Vojislav, Kaluđerović-Radoičić, Tatjana, "Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste" in Materials Science Forum, 555 (2007):131-+, https://hdl.handle.net/21.15107/rcub_vinar_6679 .