Chromium, Nickel and Cobalt

Ma, Yibing; Hooda, Peter S.

doi:10.1002/9781444319477.ch19

Cited by 33 publications

(22 citation statements)

References 97 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traces of chromium were measured during the course of the kinetics, which resulted in μ m stimulation in most cases: mainly at initial pH of 6 with values of 71.7, 63.0 and 24.5% at the low, medium and high preliminary chromium concentration, respectively. Cr(III) is thought to be rather harmless due to both its low solubility and its requirement in some metabolic processes . In the case of initial pH 7, μ m inhibition of 12.1% was obtained at the lower preliminary chromium concentration, and a stimulation of 12.56 and 11.3% at the medium and high concentrations, respectively.…”

Section: Resultsmentioning

confidence: 99%

Denitrification of metallurgic wastewater: mechanisms of inhibition by Fe, Cr and Ni

Ramírez

Rangel-Mendez

Lopes

et al. 2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND Metallurgic wastewaters are acidic effluents containing large amounts of nitrate and heavy metals. Citric acid is one of the acids used by this industry and forms stable complexes with metal ions. The aim of this study was to elucidate the chemical aspects driving inhibitory or stimulatory effects of heavy metals on denitrifying processes, based on speciation analysis and monitoring key denitrification intermediates (nitrite and N2O). RESULTS Denitrifying sludge incubations were conducted with iron, chromium and nickel, in single and multi‐metal assays, using citrate and ethanol as electron donors. Ferric‐citrate complex, [Fe‐cit](aq), was readily consumed, while complexes of divalent metals, [Fe‐cit]‐ and [Ni‐cit2]4‐, remained very stable affecting denitrification. Nitrate reduction was affected by Ni2+, while nitrite and N2O accumulation was observed with NiCO3 and Ni(OH)2 oversaturation. [Cr‐cit2]4‐ resulted in overall denitrification inhibition, while species of [Cr‐cit]2‐ caused denitrification stimulation. CONCLUSION Fe and Cr inhibited the overall denitrification process, while Ni caused accumulation of intermediates. Synergistic inhibition imposed by multi‐metal systems revealed lower inhibitory effects compared with those observed by the sum of individual effects of metals. This study elucidates chemical aspects determining the effects of heavy metals on denitrification, which is relevant to develop efficient biological processes for metallurgic effluents. © 2017 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 99%

Denitrification of metallurgic wastewater: mechanisms of inhibition by Fe, Cr and Ni

Ramírez

Rangel-Mendez

Lopes

et al. 2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…Cr has been generally referred to as an essential element for animals ( Thorvaldsson and Jónsdóttir, 2005 ). In fact, Ma and Hooda (2010) established that trivalent chromium Cr(III) is an essential/beneficial nutrient that in trace amounts regulates the sugar and cholesterol metabolism in human and animal cells, though its hexavalent form Cr(VI) is a potent carcinogen and extremely toxic for those biological systems. Importantly, a recent report by the European Food Safety Association’s Panel on Dietetic Products, Nutrition and Allergies ( EFSA NDA Panel, 2014 ) determined that there is no evidence of beneficial effects associated with Cr intake in human health, and setting of an adequate Cr intake level is also not appropriate.…”

Section: Discussionmentioning

confidence: 99%

Diacylglycerol Kinases Are Widespread in Higher Plants and Display Inducible Gene Expression in Response to Beneficial Elements, Metal, and Metalloid Ions

et al. 2017

View full text Add to dashboard Cite

Diacylglycerol kinases (DGKs) are pivotal signaling enzymes that phosphorylate diacylglycerol (DAG) to yield phosphatidic acid (PA). The biosynthesis of PA from phospholipase D (PLD) and the coupled phospholipase C (PLC)/DGK route is a crucial signaling process in eukaryotic cells. Next to PLD, the PLC/DGK pathway is the second most important generator of PA in response to biotic and abiotic stresses. In eukaryotic cells, DGK, DAG, and PA are implicated in vital processes such as growth, development, and responses to environmental cues. A plethora of DGK isoforms have been identified so far, making this a rather large family of enzymes in plants. Herein we performed a comprehensive phylogenetic analysis of DGK isoforms in model and crop plants in order to gain insight into the evolution of higher plant DGKs. Furthermore, we explored the expression profiling data available in public data bases concerning the regulation of plant DGK genes in response to beneficial elements and other metal and metalloid ions, including silver (Ag), aluminum (Al), arsenic (As), cadmium (Cd), chromium (Cr), mercury (Hg), and sodium (Na). In all plant genomes explored, we were able to find DGK representatives, though in different numbers. The phylogenetic analysis revealed that these enzymes fall into three major clusters, whose distribution depends on the composition of structural domains. The catalytic domain conserves the consensus sequence GXGXXG/A where ATP binds. The expression profiling data demonstrated that DGK genes are rapidly but transiently regulated in response to certain concentrations and time exposures of beneficial elements and other ions in different plant tissues analyzed, suggesting that DGKs may mediate signals triggered by these elements. Though this evidence is conclusive, further signaling cascades that such elements may stimulate during hormesis, involving the phosphoinositide signaling pathway and DGK genes and enzymes, remain to be elucidated.

show abstract

“…For the reference plots, significant positive element budgets were observed for Na, Cd, Co, Cr, Mo, Pb, and Zn (Table 1, Table 2, and Table 4), elements that are frequently reported in atmospheric deposition [32,38]. The Na enrichment may be ascribed to diffuse, long-distance atmospheric deposition of seawater salt, currently reported in Western Europe [39].…”

Section: Sources Of Element Inputsmentioning

confidence: 98%

Centennial Fertilization-Induced Soil Processes Control Trace Metal Dynamics. Lessons from a Long-Term Bare Fallow Experiment

Oort

Paradelo

Proix³

et al. 2018

Soil Systems

View full text Add to dashboard Cite

Long-term bare fallow (LTBF) experiments with historical sample archives offer unique opportunities to study long-term impacts of anthropogenic activities on mineral soil fractions. In natural agro-and ecosystems, such impacts are often masked by organic matter due to its buffering action and rapid turnover. The 42-plot LTBF trial of INRA (Institut National de la Recherche Agronomique) started in Versailles (France) in 1928 to assess the impacts of prolonged application of fertilizers and amendments on the composition and properties of loamy soils. Here, we established geochemical budgets of major and trace elements on surface samples from 1929 and 2014 for four groups of treatments relevant for developed soil processes. We considered accompanying effects of soil compaction or decompaction due to changing physicochemical conditions over 85 years. Element losses from the surface horizon were quantified via fertilization-induced or -amplified soil processes: clay leaching favored by Na-or K-based fertilization, and lixiviation of major and trace elements in acidic or alkaline soil conditions. Enhanced mineral weathering was shown for acidified and nonamended plots. Conclusions on trace metal migration were confirmed by selected analyses on subsurface horizons. Additional information was provided on specific element inputs via fertilizers and/or diffuse inputs via atmospheric deposition.

show abstract

Chromium, Nickel and Cobalt

Cited by 33 publications

References 97 publications

Denitrification of metallurgic wastewater: mechanisms of inhibition by Fe, Cr and Ni

Denitrification of metallurgic wastewater: mechanisms of inhibition by Fe, Cr and Ni

Diacylglycerol Kinases Are Widespread in Higher Plants and Display Inducible Gene Expression in Response to Beneficial Elements, Metal, and Metalloid Ions

Centennial Fertilization-Induced Soil Processes Control Trace Metal Dynamics. Lessons from a Long-Term Bare Fallow Experiment

Contact Info

Product

Resources

About