Electrochemical Detection of High Oxidation States of Chromium(<scp>IV</scp> and <scp>V</scp>) in Chromium‐Doped Cassiterite and Tin‐Sphene Ceramic Pigmenting Systems

Doménech, Antonio; Torres, Francisco J.; Sola, Esther Ruiz de; Alarcón, Javier

doi:10.1002/ejic.200500775

Cited by 27 publications

(24 citation statements)

References 54 publications

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“…Inoculated seeds with bacterial strains significantly enhanced the fresh biomass when compared with uninoculated control. Enhanced fresh biomass in vegetable and cereals crops with bacterial strains has also been reported by other workers (Doménech et al 2006). Seedling length was decreased significantly with the application hexavalent chromium, but the inoculated strains alleviated the toxic effect of chromium and caused an increase in the seedling length of the plant both with and without chromium stress.…”

Section: Discussionmentioning

confidence: 52%

Cicer arietinum growth promotion by Ochrobactrum intermedium and Bacillus cereus in the presence of CrCl3 and K2CrO4

2010

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The present study deals with the effect of two chromium-resistant bacteria Ochrobactrum intermedium CrT-1 and Bacillus cereus S-6 on chickpea (Cicer arietinum var NM-88) plants in the presence of two chromium salts CrCl 3 and K 2 CrO 4 (300 μg ml −1 ). Overall, the chromate salt severely affected various growth, yield and biochemical parameters of the chickpea plants. In general, bacterial inoculations enhanced various growth and biochemical parameters by alleviating the toxic effects of chromate salt. A reduction of 43% in seedling length was recorded when the plants were supplemented with 300 μg ml −1 of K 2 CrO 4 in comparison to the chromium-free control. The toxicity of chromate salt was also obvious on the fresh biomass (40%), dry weight (116%), and auxin content (143%). Higher concentrations of chromium contents were detected in root (1.912 mg Cr g −1 dry weight) and smaller quantities were transferred into shoots (0.086 mg Cr g −1 dry weight) and leaves (0.074 mg Cr g −1 dry weight).

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Section: Discussionmentioning

confidence: 52%

Cicer arietinum growth promotion by Ochrobactrum intermedium and Bacillus cereus in the presence of CrCl3 and K2CrO4

2010

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“…Chromium speciation in the malayaite and cassiterite structures is less straightforward than in the corundum structure. Authors agree on the presence of Cr 4+ in both structures, mainly substituting for Sn 4+ in octahedral symmetry (Lopez-Navarrete et al 2003;Cruciani et al 2009;Doménech et al 2006;Heyns & Harden 1999). In the case of malayaite, a very small amount of Cr 4+ in tetrahedral symmetry in substitution for Si 4+ was also detected by optical spectroscopy (Cruciani et al 2009;Lopez-Navarrete et al 2003).…”

Section: Tin-based Pink Pigments Casnsio5 and Sno2 Doped With Crsupporting

confidence: 54%

Synthesis, properties and uses of chromium-based pigments from the Manufacture de Sèvres

Verger

Dargaud

Chassé

et al. 2018

Journal of Cultural Heritage

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Chromium (Cr) is at the origin of a wide variety of coloration (green, pink and brown) in porcelain glazes from the French Manufacture de Sèvres. This element was introduced for the first time at the factory in 1804, just a few years after its discovery by Louis-Nicolas Vauquelin. Pigments for glazes were developed at the laboratory of the factory, leading to a palette of 76 references. While the synthesis protocol and the nature of the precursors of these pigments are kept in laboratory notebooks, the products have never been characterized. In this work, the pigments composed of Cr were characterized by X-ray diffraction (XRD), UVvisible spectroscopy and X-ray absorption near edge structure spectroscopy (XANES). The analyses reveal the presence of common crystalline phases, and open new perspectives for the synthesis of pigments containing chromium at the Manufacture de Sèvres.

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“…Pink decorations on porcelain artifacts can be obtained using different kinds of pigments, such as cassiterite, malayaite, or spinel doped with chromium . Recently, several studies have focused on the spinel solid solution gahnite‐zincochromite ZnAl 2− x Cr x O 4 due to its change in coloration with the chromium content .…”

Section: Introductionmentioning

confidence: 99%

The stability of gahnite doped with chromium pigments in glazes from the French manufacture of Sèvres

et al. 2016

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The French manufacture of Sèvres, famous for its production of fine porcelain artifacts, has been synthesizing pink pigments mainly composed of the spinel phase ZnAl2−xCrxO4 with x varying from 0.25 to 0.41 since the middle of the 19th century. This kind of pigment is mixed with an uncolored frit to obtain decorations for porcelain artifacts. However, the pink color of the pigment is altered in a particular uncolored frit and a brownish color appears. The mechanism of this color change was investigated. Observations under a scanning electron microscope revealed the formation of a phase rich in Cr resulting from reactions between the uncolored frit and the pigment during firing. X‐ray diffraction combined with Rietveld refinements and X‐ray absorption near edge structure measurements at the Cr K‐edge showed that the new formed phase belongs to the same spinel phase ZnAl2−xCrxO4 than the pigment, but with a higher Cr content x. We showed that its formation and thus the stability of the pigment is driven by the Al content in the uncolored frit.

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Electrochemical Detection of High Oxidation States of Chromium(IV and V) in Chromium‐Doped Cassiterite and Tin‐Sphene Ceramic Pigmenting Systems

Cited by 27 publications

References 54 publications

Cicer arietinum growth promotion by Ochrobactrum intermedium and Bacillus cereus in the presence of CrCl3 and K2CrO4

Cicer arietinum growth promotion by Ochrobactrum intermedium and Bacillus cereus in the presence of CrCl3 and K2CrO4

Synthesis, properties and uses of chromium-based pigments from the Manufacture de Sèvres

The stability of gahnite doped with chromium pigments in glazes from the French manufacture of Sèvres

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