Santabarbaraite: a new amorphous phosphate mineral

Pratesi, Giovanni; Cipriani, Curzio; Giuli, Gabriele; Birch, William D.

doi:10.1127/0935-1221/2003/0015-0185

Cited by 48 publications

(38 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The yellowish mineral, which does not show any cleavage, is amorphous (X-ray powder diffraction). This indicates that it probably corresponds to santabarbaraite, Fe 3 3+ (PO 4 ) 2 (OH) 3 .5H 2 O, a recently described mineral species which is an amorphous alteration product of vivianite (Pratesi et al, 2003). The electron-microprobe analyses (Table 5) confirm this identification, as well as the infrared spectrum shown in Fig.…”

Section: Mineralogy Of the Concretionssupporting

confidence: 72%

See 1 more Smart Citation

Vivianite formation and distribution in Lake Baikal sediments

Fagel

Alleman

Granina

et al. 2005

Global and Planetary Change

View full text Add to dashboard Cite

In an effort to better understand vivianite formation processes, four Lake Baikal sediment cores spanning two to four interglacial stages in the northern, central and southern basins and under various biogeochemical environments are scrutinized. The vivianite-rich layers were detected by anomalous P-enrichments in bulk geochemistry and visually by observations on X-radiographs. The millimetric concretions of vivianite were isolated by sieving and analysed by X-ray diffraction, scanning electron microscope (SEM), microprobe, infrared spectroscopy, inductively coupled plasma atomic emission spectrometry and mass spectrometry (ICP-AES, ICP-MS). All the vivianites display similar morphological, mineralogical and geochemical signature, suggesting a common diagenetic origin. Their geochemical signature is sensitive to secondary alteration where vivianite concretions are gradually transformed from the rim to the center into an amorphous santabarbaraite phase with a decreasing Mn content. We analysed the spatial and temporal distribution of the concretions in order to determine the primary parameters controlling the vivianite formation, e.g., lithology, sedimentation rates, and porewater chemistry. We conclude that vivianite formation in Lake Baikal is mainly controlled by porewater chemistry and sedimentation rates, and it is not a proxy for lacustrine paleoproductivity. Vivianite accumulation is not restricted to areas of slow sedimentation rates (e.g., Academician and Continent ridges). At the site of relatively fast sedimentation rate, i.e., the Posolsky Bank near the Selenga Delta, vivianite production may be more or less related to the Selenga River inputs. It could be also indirectly related to the past intensive methane escapes from the sediments. While reflecting an early diagenetic signal, the source of P and Fe porewater for vivianites genesis is still unclear.

show abstract

Section: Mineralogy Of the Concretionssupporting

confidence: 72%

“…When exposed to the air, vivianite rapidly transforms to santabarbaraite, a more oxidized phosphate mineral (Pratesi et al, 2003). This transformation explains the occurrence of an oxidized santabarbaraite rim, which surrounds a center of vivianite in some samples.…”

Section: Chemical Composition Of Vivianitementioning

confidence: 99%

Vivianite formation and distribution in Lake Baikal sediments

Fagel

Alleman

Granina

et al. 2005

Global and Planetary Change

View full text Add to dashboard Cite

show abstract

“…Additionally, its presence has been inferred from thermodynamic calculations (e.g., Nriagu and Dell 1974;Matisoff 1980). Santabarbarite, altered vivianite (Pratesi et al 2003), has been shown to occur as an amorphous rim around Lake Baikal vivianite concretions (Fagel et al 2005). Ferric phosphates are sensitive to reductive dissolution both chemically and by microbial metabolism (Jones et al 1983).…”

Section: Dissolutionmentioning

confidence: 99%

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

Orihel

Baulch

Casson

et al. 2017

Can. J. Fish. Aquat. Sci.

181

133

View full text Add to dashboard Cite

Many physical, chemical, and biological processes in freshwater ecosystems mobilize the nutrient phosphorus (P) from sediments, which in turn may contribute to the formation of harmful algal blooms. Here, we critically reviewed internal P loading in Canadian fresh waters to understand the geographic patterns and environmental drivers of this important process. From 43 publications, we consolidated 618 estimates of internal P loading from Canadian freshwater ponds, lakes, reservoirs, and coastal wetlands (n = 70). Expressed in terms of total P, short-term gross rates in sediment samples (L gross ) ranged from −27 to 54 mg·m −2 ·day −1 (n = 461), while long-term net rates in whole ecosystems (L net ) ranged from −1694 to 10 640 mg·m −2 ·year −1 (n = 157). The main environmental drivers of this variation were oxygen, pH, geology, and trophic state. Internal P loading tended to be higher during the open-water season and most prominent in small prairie lakes. Priorities for future research on internal P loading should include resolving methodological problems, assessing the relative importance of different mechanisms, examining the influence of anthropogenic activities, and quantifying rates in understudied ecosystems. Résumé :De nombreux processus physiques, chimiques et biologiques dans les écosystèmes d'eau douce mobilisent le phosphore (P), un élément nutritif, des sédiments, ce qui peut favoriser la formation de fleurs d'eau néfastes. Nous avons effectué un examen critique de l'apport interne de P dans les plans d'eau douce canadiens afin de comprendre les motifs de répartition géographique et les facteurs environnementaux qui influent sur cet important processus. À la lumière de 43 publications, nous avons colligé 618 estimations de l'apport interne de P d'étangs, de lacs, de réservoirs et de milieux humides littoraux d'eau douce canadiens (n = 70). Exprimés en termes de P total, les taux d'apport de P à court terme pour les échantillons de sédiments (L gross ) vont de −27 à 54 mg·m -2 ·jour -1 (n = 461), alors que les taux nets à long terme à l'échelle de l'écosystème (L net ) vont de −1694 à 10 640 mg·m -2 ·an -1 (n = 157). Les principaux facteurs environnementaux influant sur ces variations sont l'oxygène, le pH, la géologie et l'état trophique. L'apport interne de P tend à être plus élevé durant la période d'eau libre et le plus marqué dans les petits lacs de prairie. La priorité des travaux futurs sur l'apport interne de P devrait porter sur la résolution de problèmes méthodologiques, l'évaluation de l'importance relative de différents mécanismes, l'examen de l'influence des activités humaines et la quantification des taux dans les écosystèmes sous-étudiés. [Traduit par la Rédaction]

show abstract

“…Occurrences of vivianite deposits and of its use as pigment are listed in literature [1,47,[76][77][78][79][80]. As a pigment, it only shows medium stability [47,81] [76,82,83]. Oxidation is expected to be faster in air, and to slow down once the pigment is embedded in a binder [47].…”

Section: Vivianite (Fe 3 (Po 4 )2·8h 2 O Blue)mentioning

confidence: 99%

On the stability of mediaeval inorganic pigments: a literature review of the effect of climate, material selection, biological activity, analysis and conservation treatments

2017

View full text Add to dashboard Cite

This review is to be considered part of the development of the MEMORI dosimeter, to evaluate the impact of climate (relative humidity, temperature, illumination, etc., including volatile organic compounds) on moveable objects. In the framework of the MEMORI project, Ghent University was given the task to assess pigment degradation upon acetic acid exposure, and to collect information on pigments' stability. Moreover, to obtain a wider knowledge on the stability of common pigments, the effect of a variety of parameters was reviewed from literature. Discolouration and degradation of pigments significantly alter the legibility of polychrome works of art, so that the development of monitoring methods to ensure the preservation of cultural heritage objects is of primary importance.

show abstract

Santabarbaraite: a new amorphous phosphate mineral

Cited by 48 publications

References 18 publications

Vivianite formation and distribution in Lake Baikal sediments

Vivianite formation and distribution in Lake Baikal sediments

Internal phosphorus loading in Canadian fresh waters: a critical review and data analysis

On the stability of mediaeval inorganic pigments: a literature review of the effect of climate, material selection, biological activity, analysis and conservation treatments

Contact Info

Product

Resources

About