1996
DOI: 10.1021/la9603277
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Effect of Precipitating Conditions on the Formation of Calcium−HEDP Precipitates

Abstract: Phosphonates are water treatment chemicals that are effectively utilized in many industrial processes as dispersants, bleaching agents, or scale and corrosion inhibitors. In many of these applications, the phosphonates are able to react with divalent cations such as calcium to form stable divalent cationphosphonate precipitates. The focus of this paper is to define the conditions under which distinct calciumphosphonate precipitates will form and to study how each of these precipitate's unique chemical and phys… Show more

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Cited by 48 publications
(31 citation statements)
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“…The coating and the reference precipitate showed similar XRD diffuse patterns at ϳ2 31°( Figure 5), in agreement with results reported by Browning et al 15 Due to their amorphous nature, no structural identification could be made; however, ESI-MS clearly detected the etidronic acid (H 3 L Ϫ form) as the main peak in both the coating and all comparison samples. This H 3 L Ϫ form is also consistent with ESI-MS analyses of bisphosphonates reported in literature.…”
Section: Hsupporting
confidence: 90%
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“…The coating and the reference precipitate showed similar XRD diffuse patterns at ϳ2 31°( Figure 5), in agreement with results reported by Browning et al 15 Due to their amorphous nature, no structural identification could be made; however, ESI-MS clearly detected the etidronic acid (H 3 L Ϫ form) as the main peak in both the coating and all comparison samples. This H 3 L Ϫ form is also consistent with ESI-MS analyses of bisphosphonates reported in literature.…”
Section: Hsupporting
confidence: 90%
“…4 -6). 15 Its Ca/P ratio (1.02) is close to the Ca 2 C 2 H 4 O 7 stoichiometry (Ca 2 L, Ca/P ϭ 1, Eq. 6).…”
Section: Hmentioning
confidence: 64%
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“…The first one is crystalline and its molecular formula is Ca(CH 3 C-(OH)(PO 3 H) 2 ) 3 2H 2 O, while the second one is amorphous. 32 XRD analysis of the calcite surface after long-term contact (i.e., one week) with a 5 mM HEDP solution (ex-situ experiments) showed that the new phase formed on the calcite cleavage plane was crystalline. The XRD pattern of the overgrowth is shown in Figure 4.…”
Section: Methodsmentioning
confidence: 99%