Environmental aspects of boron

Shibli, Amal; Srebnik, Morris

doi:10.1016/s0169-3158(06)80010-1

Cited by 8 publications

(9 citation statements)

References 138 publications

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“…El ácido bórico es muy débil, con valores pKa de 9.2, 12.4 y 13.5 para su primera, segunda y tercera disociación, respectivamente; por lo tanto, tiene muy poca tendencia a ceder protones en disolución acuosa y, a las condiciones habituales de acidez de los suelos de uso agrícola, se encontrará principalmente en forma de B(OH)3 [4,[9][10][11]. Su equilibrio de disociación puede escribirse como:…”

Section: Aspectos Relevantes De La Química Del Borounclassified

Polyurethanes with boron retention properties for the development of agricultural fertilization smart systems.

Palencia¹,

Lerma²,

Córdoba³

2016

J. Sci. Technol. Appl.

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Boron (B) is an essential micronutrient for nutrition and growth of the plants, it is associated to the productivity of crops and quality of agricultural products. However, an excess of B produces toxicity and negative impacts on the plants affecting different shackles of the productive chain of many crops. From the above it is concluded that the correct diagnosis of phytoavailable B amounts in the soils, as well as, its correct incorporation during the fertilization process, are essential stages for the development of sustainable crops. The aim of this study was to develop new polymer materials based in polyurethanes (PUs), for the building of fertilization smart systems for B which will permit to proceed towards the implementation of new technologies with potential agricultural applications. For that, different methodologies were evaluated for the construction of boron-retaining polymers: (i) urethanization of high molecular weight polyols, (ii) making of interpenetrating polymer networks and (iii) urethane-based grafting polymers. Polymers were synthesized and characterized by different techniques and the B amounts Boron Smart polymer Polymer network Grafting polymer Boro Polímeros inteligentes Redes poliméricas Polímeros de injerto

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Section: Aspectos Relevantes De La Química Del Borounclassified

Polyurethanes with boron retention properties for the development of agricultural fertilization smart systems.

Palencia¹,

Lerma²,

Córdoba³

2016

J. Sci. Technol. Appl.

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“…At neutral or slightly acidic conditions in natural waters and soils, B occurs as undissociated boric acid B(OH) 3 , a weak Lewis acid with relatively high solubility in water. At higher pH, boric acid accepts OH -to form borate ions B(OH) 4 -, whereas at high B concentrations, regardless of pH, polyborate species, such as B 3 O 3 (OH) 4 -and B 4 O 5 (OH) 4 -, become important, in addition to boric acid and borate (Leeman and Sisson 1996;Shibli and Srebnik 2005). B is an essential micronutrient for plants, but the range between deficient and toxic concentrations is unusually small (Shibli and Srebnik 2005).…”

Section: Boron In the Environmentmentioning

confidence: 99%

“…At higher pH, boric acid accepts OH -to form borate ions B(OH) 4 -, whereas at high B concentrations, regardless of pH, polyborate species, such as B 3 O 3 (OH) 4 -and B 4 O 5 (OH) 4 -, become important, in addition to boric acid and borate (Leeman and Sisson 1996;Shibli and Srebnik 2005). B is an essential micronutrient for plants, but the range between deficient and toxic concentrations is unusually small (Shibli and Srebnik 2005). The surrounding geology and, in some cases, wastewater discharges, control the B concentrations in ground and surface water.…”

Section: Boron In the Environmentmentioning

confidence: 99%

“…Preventive measures, tailings remediation, and water deboronation technologies (Dydo and Turek 2013;Wolska and Bryjak 2013) rely on an improved knowledge of sources of natural and anthropogenic soluble B associated with mining industries. Typical anthropogenic sources of B to the environment include industrial cleaning products, irrigation water, coal surface mining, and fly ash (Leeman and Sisson 1996;Shibli and Srebnik 2005). Elevated B contents in groundwater have been tied, at least in part, with slag deposited in industrial landfills (Senior and Sloto 2006;Yoshinaga et al 2011).…”

Section: Boron In the Environmentmentioning

confidence: 99%

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Environmentally Hazardous Boron in Gold Mine Tailings, Timmins, Ontario, Canada

Paliewicz

Sirbescu

Sulatycky³

et al. 2014

Mine Water Environ

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Traditionally, cyanide, mercury, and acid mine drainage are considered critical environmental hazards associated with gold mining. To our knowledge, this is the first study of hazardous concentrations of soluble boron (B) in a gold mine impoundment tailings dam. We suggest that the B anomaly is a consequence of disposal of gold pyrometallurgical waste (slag). Borax is a common flux used during fire assaying and refining of precious metals. Vast amounts of B-rich slag may have been discarded by mining operations and precious metal refineries worldwide, but the extent and effects of B contamination have not yet been addressed. Anomalous concentrations of soluble B found in the McIntyre mine tailings, Timmins, Ontario highly exceed recommended thresholds for groundwater, freshwater, and soil leachates, and cannot be explained by natural sources alone. Boron is distributed heterogeneously within the tailings dam and correlates positively with the percentage of B38 lm grain-size fraction, indicating that adsorption onto silt-clay particles results in B build-up.Ephemeral, efflorescent Mg-borate found along the dam embankment suggests an outflow of B along paths of high permeability. Leachability tests indicate that slags from gold-ore refineries and fire assaying labs release B12 wt% soluble B in only 24 h. This high leachability suggests that slag discarded on the tailings dam is the dominant source of observed B anomalies. Altered metabasalts with \3,000 mg/kg B may be a minor B source. Gangue minerals such as tourmaline, anhydrite, calcite, and siderite cannot account for the amount of soluble B found in the tailings.

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“…Boron is widely distributed in the environment, and it has been proven to be an essential micronutrient for living organisms, and especially plants [1]. However, elevated boron intake is harmful to humans, animals and plants [2,3].…”

Section: Introductionmentioning

confidence: 99%

Potential Chemical Oxo-precipitation (COP) for Remediating Wastewater with a High Boron Concentration using H2O2/Ba(OH)2 at Room Temperature

et al. 2014

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Among current approaches for removing boron, chemical precipitation is widely used for treating wastewater that contain a high boron concentration. The need for heating and very large amounts of coagulant limits the efficiency of this method. Accordingly, this work developed a chemical oxo-preceipitation (COP) method, which uses hydrogen peroxide (H2O2) as the oxidant and barium hydroxide (Ba(OH)2) as the precipitant to improve considerably the chemical precipitation of wastewater with a high concentration of boron at room temperature. Under suitable conditions (pHi 9, mole ratio of H2O2/B = 2, and mole ratio of Ba/B = 0.8), boron can be efficiently removed from solution by forming amorphous precipitates of barium perborate. After four hours, amorphous barium perborate was transformed to a particular species with a crystalline phase. Consequently, the boron concentration was reduced from 1000 mg/L to 2 mg/L in six hours. The results of XRD, Raman spectroscopy and ICP prove that a dinuclear perborate with double peroxo bridges constituted the crystalline precipitate whose chemical formula was found to be BaB2(O2)2(OH)4-n (OOH)n.

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Environmental aspects of boron

Cited by 8 publications

References 138 publications

Polyurethanes with boron retention properties for the development of agricultural fertilization smart systems.

Polyurethanes with boron retention properties for the development of agricultural fertilization smart systems.

Environmentally Hazardous Boron in Gold Mine Tailings, Timmins, Ontario, Canada

Potential Chemical Oxo-precipitation (COP) for Remediating Wastewater with a High Boron Concentration using H2O2/Ba(OH)2 at Room Temperature

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