Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca5(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: Ca5(AsO4)3OH, Ca4(AsO4)2, Ca3(AsO 4)2 Ca5H2(AsO4) 2 and CaHAsO4 was performed, which is based on the calculation of the ion-ion interaction potential (HIP). It has been demonstrated earlier that IIIP, 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 R...y 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.
TY - JOUR
AU - Raičević, Slavica
AU - Stanić, Vojislav
AU - Kaluđerović-Radoičić, Tatjana
PY - 2007
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1017
AB - Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca5(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: Ca5(AsO4)3OH, Ca4(AsO4)2, Ca3(AsO 4)2 Ca5H2(AsO4) 2 and CaHAsO4 was performed, which is based on the calculation of the ion-ion interaction potential (HIP). It has been demonstrated earlier that IIIP, 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.
PB - 8th Conference of the Yugoslav Materials Research Society
T2 - Materials Science Forum
T1 - Theoretical assessment of calcium arsenates stability: Application in the treatment of arsenic contaminated waste
EP - 136
SP - 131
VL - 555
DO - 10.4028/0-87849-441-3.131
UR - conv_6884
ER -
@article{
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 Ca5(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: Ca5(AsO4)3OH, Ca4(AsO4)2, Ca3(AsO 4)2 Ca5H2(AsO4) 2 and CaHAsO4 was performed, which is based on the calculation of the ion-ion interaction potential (HIP). It has been demonstrated earlier that IIIP, 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.",
publisher = "8th Conference of the Yugoslav Materials Research Society",
journal = "Materials Science Forum",
title = "Theoretical assessment of calcium arsenates stability: Application in the treatment of arsenic contaminated waste",
pages = "136-131",
volume = "555",
doi = "10.4028/0-87849-441-3.131",
url = "conv_6884"
}
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
8th Conference of the Yugoslav Materials Research Society., 555, 131-136.
https://doi.org/10.4028/0-87849-441-3.131
conv_6884
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;555:131-136.
doi:10.4028/0-87849-441-3.131
conv_6884 .
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):131-136,
https://doi.org/10.4028/0-87849-441-3.131 .,
conv_6884 .
