Força iônica da solução de equilíbrio na adsorção de arsênio em latossolos brasileiros

Campos, Mari Lucia; Guilherme, Luiz Roberto Guimarães; Visiolli, Elton; Antunes, Alessandra Silveira; Curi, Nilton; Marques, João José; Silva, Marx Leandro Naves

doi:10.1590/s0100-204x2006000300012

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…Esses Latossolos já foram alvo de outros estudos de adsorção (Guilherme et al, 1998;Pierangeli et al, 2001aPierangeli et al, ,b,c, 2003Pierangeli et al, , 2004Campos et al, 2006), de teores semitotais de Ets (Campos et al, 2003), entre outros. A caracterização física, química e mineralógica desses solos pode ser encontrada em Silva et al (1996) e Silva (1997.…”

Section: Methodsunclassified

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Campos

Guilherme

Lopes³

et al. 2007

Rev. Bras. Ciênc. Solo

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SUMMARY: CONTENT AND MAXIMUM CAPACITY OF ARSENIC ADSORPTION IN BRAZILIAN OXISOLSIn view of the toxicity of As for man and animals and the possibility of existence of a great number of contaminated areas it is imperative to know the total As content in soils considered uncontaminated and about As sorption processes in soils of variable charge. The objective of this work was to determine the total content and maximum capacity of As

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Section: Methodsunclassified

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Campos

Guilherme

Lopes³

et al. 2007

Rev. Bras. Ciênc. Solo

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“…Then, the samples were centrifuged for 20 min at 3000 rpm and the supernatant was collected for As analyses in order to calculate As adsorption. This batch configuration (methodology) used in this work has been documented in several studies involving metal adsorption and desorption [21][22][23][24][25][26]. The reaction time of 72 h was selected based on kinetic studies conducted on Oxisols (oxide-rich soils, as is the red mud), which showed that the reaction time used in this study (72 h) was sufficient to reach the equilibrium of the reaction between the solid and liquid phases [27].…”

Section: Arsenic Adsorption and Desorptionmentioning

confidence: 99%

Increasing arsenic sorption on red mud by phosphogypsum addition

Lopes

Guilherme

Costa

et al. 2013

Journal of Hazardous Materials

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“…In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

Guimarães

Dias

Assis

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe processing of gold ores exploited in Paracatu, MG, generates tailings that are challenging for revegetation, mainly because of the high content of arsenic and salinity. Aiming at the revegetation of the area of disposal of these tailings, the objective of this study was to evaluate the effects of phosphorus doses on vetiver plants (Chrysopogon zizanioides) and on the planting substrate, which consisted of tailings from the processing of ore named B1, exploited in Paracatu, with water restriction. Vetiver was grown for four months in the substrate under doses of 0, 140, 280, 560 and 1280 mg kg -1 of P 2 O 5 . Increasing doses of phosphorus improved the chemical characteristics of the substrate. However, the highest dose (1280 mg kg -1 P 2 O 5 ) resulted in higher toxicity of arsenic for the plants. Under the evaluated conditions, the dose of 560 mg kg -1 of P 2 O 5 is the most suitable for the fertilization of vetiver and, therefore, also for the revegetation of the substrate. Vetiver survives under low availability of water in the tailings.Cultivo de vetiver em um rejeito salino contaminado com arsênio sob doses de fósforo IntroductionSome ores exploited for gold production may contain toxic elements, such as arsenic (As), in their composition, causing environmental problems. In Brazil, gold and iron mining has contributed to the dispersion of As and its entry in the food chain (Campos et al., 2006).The tailings produced in the processing of gold ores exploited in Paracatu, MG, Brazil, have limiting characteristics to plant growth, especially acidity, salinity and high As concentrations, which compromise the process of revegetation of the basin where they are disposed. A practice that can facilitate the establishment of plants in these tailings is phosphate fertilization.The addition of P has been reported as inhibitor of As absorption (Lei et al., 2012). Phosphate and arsenate are chemically similar and share the same membrane transporters in root cells, and the transporters have higher affinity for the phosphate (Tu & Ma, 2003;Zhao et al., 2008).Besides phosphate fertilization, plants tolerant to As and to salinity may have promising responses for the revegetation of tailings. One species with desirable characteristics to start the process of revegetation is Chrysopogon zizanioides (vetiver). The species, besides having high biomass production, has high tolerance and capacity of accumulation of contaminants (Singh et al., 2007).In this context, this study aimed to evaluate the effects of P doses on vetiver plants and on the planting substrate, which consisted of tailings from the processing of one of the gold ores exploited in Paracatu, MG, Brazil, subjected to water restriction. Material and MethodsThe substrate consisted of tailings from the processing of B1 ore, which is a highly weathered phyllite, with sulfide contents around 3.0 g kg -1 , collected in Paracatu, MG, Brazil. Three samples of the substrate were collected for its initial characterization, through the determination of pH i...

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Força iônica da solução de equilíbrio na adsorção de arsênio em latossolos brasileiros

Cited by 7 publications

References 12 publications

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Increasing arsenic sorption on red mud by phosphogypsum addition

Cultivation of vetiver in saline tailings contaminated with arsenic under phosphorus doses

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