Influence of disodium EDTA on the nucleation and growth of struvite and carbonate apatite

Prywer, Jolanta; Olszynski, Marcin

doi:10.1016/j.jcrysgro.2013.04.027

Cited by 34 publications

(41 citation statements)

References 15 publications

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“…The speciation analysis presented in the present paper suggests that in the case of urine the reaction of struvite formation runs also similarly to the reaction in the wastewater rather than according to Eq. (11). As mentioned in Introduction, CA starts to be formed for pH !…”

Section: àmentioning

confidence: 87%

“…(10) and (11). As mentioned in Introduction, in the solution of urine with additional amount of the CO 2 and the NH 3 which follows from the presence in urine ureasepositive bacteria, the chemical individuals such as NH 4 þ , NH 3 $H 2 O, H 2 CO 3 , HCO 3 À and CO 3 2À are present as a result of the reactions of dissociation and hydrolysis described by Eqs.…”

Section: àmentioning

confidence: 99%

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Chemical equilibria of complexes in urine. A contribution to the physicochemistry of infectious urinary stone formation

Prywer

Mielniczek‐Brzóska

2016

Fluid Phase Equilibria

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Section: àmentioning

confidence: 87%

Section: àmentioning

confidence: 99%

Chemical equilibria of complexes in urine. A contribution to the physicochemistry of infectious urinary stone formation

Prywer

Mielniczek‐Brzóska

2016

Fluid Phase Equilibria

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“…However, we met with the objections that CA cannot be formed in artificial urine of the composition used in our study. It was also pointed out that CA may be in crystalline form only, not amorphous as we claimed in some of our articles [12][13][14][15][16][17][18]. Therefore, the first aim of this study was to obtain precipitates in artificial urine in the case of the presence of bacteria and in the case when the infection is mimicked in a chemical manner.…”

Section: Introductionmentioning

confidence: 86%

“…Over recent years we have published a series of articles concerning infectious urinary stones [12][13][14][15][16][17][18]. In these articles we considered struvite and CA as the main components of this kind of stones.…”

Section: Introductionmentioning

confidence: 99%

Solid Phases Precipitating in Artificial Urine in the Absence and Presence of Bacteria Proteus mirabilis—A Contribution to the Understanding of Infectious Urinary Stone Formation

et al. 2018

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Magnesium ammonium phosphate hexahydrate, called struvite, is the dominant component of infectious urinary stones. In addition to struvite, infectious urinary stones include solid phases with poor crystallinity as well as amorphous matter. This article is devoted to the analysis of these solid phases, because they have not been characterized well until now. The solid phases tested were obtained from artificial urine in the absence and presence of Proteus mirabilis. The solid phases were characterized by different techniques (X-ray Diffraction, Energy Dispersive X-ray, Scanning Electron Microscopy, as well as Raman and Infrared Spectroscopies). According to the results these phases are carbonate apatite (CA), hydroxylapatite (HAP), amorphous calcium carbonate (ACC), amorphous calcium phosphate (ACP) and/or amorphous carbonated calcium phosphate (ACCP). Carbonate apatite and hydroxylapatite may occur in non-stoichiometric forms, i.e., various anions can be substituted for CO 3 2− , OH − , and PO 4 3− groups in them. The non-stoichiometry of carbonate apatite and hydroxylapatite also implies a deficiency of calcium ions, i.e., calcium ions may be partially replaced by other cations. Experimental techniques and chemical speciation analysis demonstrate that the presence of magnesium influences the formation of CA and HAP.

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“…Basically, the presence of impurities in the solution affects the growth rate of crystals by blocking of active growth sites and inhibiting the increase of crystal size. (Prywer and Olszynski, 2013).…”

Section: Discussion Chemical Equilibrium Model and Mineral Speciatiomentioning

confidence: 99%

Effect of Calcium Additive on the Crystallization of Struvite

Perwitasari

Edahwati

Sutiyono

et al. 2016

MATEC Web of Conferences

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Crystallization of struvite [MgNH4PO4.6H2O] may lead to the deposition of scale which may create significant problems in the process pipes, pumps and other industrial equipment. However, struvite precipitation can be benefited for phosphate recovery for use of fertilizer. The aim at the present work was to investigate calcium additive on struvite precipitation. The experiment was carried out in a batch mode using a 1-liter Pyrex glass vessel mechanically agitated for 200 rpm. The scale-forming solution was prepared for mixing solutions to MgCl2 and NH4H2PO4 with Mg +2 , NH4 + and PO4 -3 in a molar ratio of 1: 1:1. The crystallization temperature of 30 and 40 O C was selected. Ca was added into the crystallizing solution to chloride dihydrate 0.4M (CaCl2•2H2O). Then each solution was pH adjusted to 9 by addition of KOH. The crystals obtained were characterized using SEM for morphology, EDS for elemental analysis as well as XRPD Rietveld analysis for crystaline phases. The induction periods varied from 10 to 90 min, which means that the struvite crystals began forming 10 to 90 min after mixing of the solution. It was observed that the Ca additive may inhibit the struvite crystallization. SEM analysis revealed that the struvite crystals obtained were predominantly of irregular prismatic morphology. Furthermore, the EDS pattern revealed that the elemental composition of the crystals consisted of Ca, Cl, S Mg, N, and P, providing that many crystalline phase found in the crystals such as Gypsum, CaCl2, struvite, struvite-(K) and sylvite. It was observed that the Ca additive appeared to inhibit the struvite crystallization.

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Influence of disodium EDTA on the nucleation and growth of struvite and carbonate apatite

Cited by 34 publications

References 15 publications

Chemical equilibria of complexes in urine. A contribution to the physicochemistry of infectious urinary stone formation

Chemical equilibria of complexes in urine. A contribution to the physicochemistry of infectious urinary stone formation

Solid Phases Precipitating in Artificial Urine in the Absence and Presence of Bacteria Proteus mirabilis—A Contribution to the Understanding of Infectious Urinary Stone Formation

Effect of Calcium Additive on the Crystallization of Struvite

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