Solubility of pyromorphite Pb5(PO4)3Cl at 5–65°C and its experimentally determined thermodynamic parameters

Topolska, Justyna; Manecki, Maciej; Bajda, Tomasz; Borkiewicz, Olaf J.; Budzewski, Przemysław

doi:10.1016/j.jct.2016.03.031

Cited by 25 publications

(23 citation statements)

References 22 publications

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“…the sam ples col lected in 2200 h, 3200 h and 4000 h of the ex per i ment yielded val ues iden ti cal within the ex per imen tal er ror (ver i fied with the use of a Stu dent's t-test, at a = 0.05). Three con sec u tive anal y ses per formed for a so lu tion over a pe riod of sev eral weeks, re veal ing sta tis ti cally iden ti cal con cen tra tion val ues, are usu ally a suf fi cient cri te rion to recog nize the equi lib rium of the sys tem (e.g., Topolska et al, 2016). There fore, the res i due was sam pled and ana lysed using SEM.…”

Section: Dissolution Of Vanadinite: Implication Of the Results Of 8-mmentioning

confidence: 99%

“…Among all Pb-apatites, pyromorphite is a min eral of the best-known prop er ties, as in di cated by the num ber of pub li cations (e.g., Ma et al, 1994a, b;Flis et al, 2010Flis et al, , 2011Bajda, 2010;Baikie et al, 2014;Topolska et al, 2016). Scheckel and Ryan (2002) re ported on the ne ces sity of 24-hour-long ag ing of the pyromorphite pre cip i tate formed dur ing dropwise synthe sis.…”

Section: Time-dependent Synthesis and Its Implications On Dissolutionmentioning

confidence: 99%

“…The ex per i men tally de ter mined ther mo dy namic pa ram eters of pyromorphite, mimetite and their in ter me di ate members have been pub lished in a num ber of pa pers (Bajda, 2010;Flis et al, 2010;Topolska et al, 2016). Re search on the proper ties of vanadinite, the third end-mem ber in a solid so lu tion se ries of an ionic sub sti tu tions among Pb-apatites (Baker, 1966), is still on go ing and is more prob lem atic.…”

Section: Time and The Experimental Thermodynamicsmentioning

confidence: 99%

“…In duced pre cip i ta tion of these phases is the fun da men tal con cept of the in situ im mo bi liza tion of Pb and As in con tam i nated soils and wastes (e.g., Cotter-Howells, 1996;Cot ter-Howells and Caporn, 1996;Manecki et al, 2000;Cam pos, 2002;Cao and Ma, 2004;Bajda et al, 2007). Op ti mi za tion of this treat ment method re quires ex ten sive re search on ap a tite phases in the field of their iden ti fi ca tion, crys tal li za tion, trans for ma tion, struc ture re fine ment and thermo dy namic sta bil ity (e.g., Ma et al, 1994a, b;Flis et al, 2010Flis et al, , 2011Bajda, 2010;Baikie et al, 2014;Topolska et al, 2016;Solecka et al, 2018;Puzio et al, 2018). Also, a num ber of pub lica tions on the in flu ence of mi cro or gan isms on the sta bil ity of Pb-apatites in the en vi ron ment has been pub lished (e.g., Manecki and Maurice, 2008;Park et al, 2011;Topolska et al, 2013Topolska et al, , 2014Ceci et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Time constraints on experimental studies of lead apatites

Topolska

Bajda

Puzio

et al. 2019

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As so ci ate Ed i tor: Jacek Szczepañski The pa per pres ents the re sults of ex per i men tal stud ies on the syn the sis and ther mo dy namic sta bil ity of se lected Pb-apatites in terms of cri te ria de ter min ing ter mi na tion of the ex per i ments. Based on the case study, we in di cate dif fi cul ties in ana lys ing the ob tained ex per i men tal data. Time-re solved sam pling of pre cip i tate formed dur ing a dropwise syn the sis of pyromorphite was per formed and the re sults were com pared to the lit er a ture data. It has been con cluded that the Ostwald rip en ing time for syn the sized sol ids de pends pri mar ily on the chem i cal com po si tion of the in tended Pb-ap a tite phase. We pre sented that heter o ge ne ity of pre cip i tate af fects its dis so lu tion in terms of re peat abil ity of the re sults and equilibrating time. A unique 9-year-long ex per i ment on vanadinite sta bil ity at a pH range from 2.0-6.0 re vealed that among all tested dis so lu tion con ditions only the re ac tions at the pH = 3.5 can per form as the ba sis for some ther mo dy namic cal cu la tions. It has been con cluded that the rate of phase tran si tions in the Pb-apatites group can be mis lead ing in terms of de ter min ing the equi lib rium of the sys tem, and the ex per i men tal setup de signed par tic u larly to pro vide re li able con trols in this as pect should be in volved. Means in this re spect have been pro posed. Key words: pyromorphite, vanadinite, ex per i men tal min er al ogy, dis so lu tion, sol u bil ity syn the sis.

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Section: Dissolution Of Vanadinite: Implication Of the Results Of 8-mmentioning

confidence: 99%

Section: Time-dependent Synthesis and Its Implications On Dissolutionmentioning

confidence: 99%

Section: Time and The Experimental Thermodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Time constraints on experimental studies of lead apatites

Topolska

Bajda

Puzio

et al. 2019

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“…Therefore, since IAP is at equilibrium equal to the solubility product Ksp, the results were fit to a nonlinear model ( Figure 14) assuming constant heat capacity of the dissolution reaction [39,40]:…”

Section: Discussionmentioning

confidence: 99%

Transition from Endothermic to Exothermic Dissolution of Hydroxyapatite Ca5(PO4)3OH–Johnbaumite Ca5(AsO4)3OH Solid Solution Series at Temperatures Ranging from 5 to 65 °C

2018

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Abstract:Five crystalline members of the hydroxyapatite (HAP; Ca 5 (PO 4 ) 3 OH)-johnbaumite (JBM; Ca 5 (AsO 4 ) 3 OH) series were crystallized at alkaline pH from aqueous solutions and used in dissolution experiments at 5, 25, 45, and 65 • C. Equilibrium was established within three months. Dissolution was slightly incongruent, particularly at the high-P end of the series. For the first time, the Gibbs free energy of formation ∆G

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Lead in Water and Soil: Speciation, Toxicity, and Treatment Technologies

Manecki

2019

Encyclopedia of Water

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Lead (Pb) is widely distributed in the environment and its negative health effects, especially to children, have been well documented. The aqueous species of Pb, in their form and concentration, strongly depend on mineral–water interaction processes in the environment. Lead exists in the environment mostly in the form of solid particles but bioavailable toxic Pb is absorbed by living organisms through solution. Therefore, our understanding of formation, transformation, dissolution, and precipitation of Pb‐bearing phases in aqueous solutions is critical for successful strategies to minimize Pb in drinking water or food and to prevent exposure and poisoning. This article summarizes our current understanding of processes governing the presence of Pb in waters and soils, briefly discusses Pb toxicity, and reviews some key technologies for immobilizing Pb and making it less bioavailable. Finally, the article ends with some suggestions for further research.

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Solubility of pyromorphite Pb5(PO4)3Cl at 5–65°C and its experimentally determined thermodynamic parameters

Cited by 25 publications

References 22 publications

Time constraints on experimental studies of lead apatites

Time constraints on experimental studies of lead apatites

Transition from Endothermic to Exothermic Dissolution of Hydroxyapatite Ca5(PO4)3OH–Johnbaumite Ca5(AsO4)3OH Solid Solution Series at Temperatures Ranging from 5 to 65 °C

Lead in Water and Soil: Speciation, Toxicity, and Treatment Technologies

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