Phytoextraction of heavy metals from a landfill in the metropolitan region of Belém-Pará-Brazil

The interaction between heavy metals and soil constituents is one of the most important factors influencing the potential for ground water pollution. To study Pb behavior, samples of soils were incubated with a salt solution containing this metal. The experimental units consisted of plastic bags, partially opened with 0.1 dm³ of soil with three replications. After incubation, samples were subjected to sequential and selective extractions. Lead retention, measured by the maximum adsorption capacity of the soil, was relatively high with values ranging from 6,439 to 22,148 mg kg-1. The sequential and selective extractions showed that Pb adsorption was stable where the metal was found mainly in organic matter, Fe and Al oxides, and residual forms (specific adsorption). The capacity of the soils to retain Pb, thereby increasing the leaching potential of the metal, was in the sequence of: Histosol - Oxisol - Inceptisol.

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Disponibilidade de metais pesados e sua correlação com a matéria orgânica do solo em áreas produtoras de hortaliças na Região Metropolitana de Belém/Pa / Availability of heavy metals and their correlation with a soil organic material in vegetable producing areas in the Metropolitan Region of Belém/Pa

Brazilian Journal of Development ◽

10.34117/bjdv7n11-500 ◽

2021 ◽

Vol 7 (11) ◽

pp. 109022-109032

Author(s):

Nayara Kelly Feitosa Ferreira ◽

Cássio Furtado Lima ◽

Érica Bandeira Maués de Azevedo ◽

Angleson Figueira Marinho ◽

Fernanda de Oliveira Araújo ◽

...

Keyword(s):

Heavy Metals ◽

Organic Material ◽

Metropolitan Region

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ASSESSMENT OF HEAVY METAL FOCUSING ON CADMIUM, COPPER AND LEAD UPTAKE BY CROPS IN GREATER BANGKOK METROPOLITAN REGION, THAILAND

Scientific Journal of Tra Vinh University ◽

10.35382/18594816.1.40.2020.626 ◽

2020 ◽

Vol 1 (40) ◽

pp. 149-162

Author(s):

Trang Huynh Thi Thu Thach ◽

Son Phuoc Lai

Keyword(s):

Heavy Metals ◽

Inductively Coupled Plasma ◽

Daily Intake ◽

Metropolitan Region ◽

Lead Uptake ◽

Inductively Coupled ◽

Significant Difference ◽

Balance Analysis ◽

Cadmium And Lead ◽

Edible Parts

The objective of this study is to assess heavy metals, copper, cadmium and lead, uptake by food crops andvegetables grown in the greater Bangkok Metropolitan Region in Thailand. The three heavy metals were detected in three types of vegetables cultivated in three provinces Pathum Thani, Ayutthaya, and Nonthaburi representing Greater Bangkok Metropolitan Region (GBMR). An Inductively Coupled Plasma method was used to estimate and evaluate the levels of these metals’ concentration in the vegetables, soil, water, manure, and chemical fertilizer. The physical and chemical characterizations of which were conducted to compare the heavy metals concentrations with similar characteristics. Heavy metals concentrations were compared both in wetand dry season. Moreover, the edible and non-edible parts of the vegetables were also considered for the comparative study and found a significant difference in copper (Cu) concentrations in morning glory.The concentrations of Cu were found in edible and non-edible parts were 0.38 and 1.10 ug/g respectively. To account the flow of heavy metals concentration in certain location, a mass balance analysis was conducted for the three different provinces, and found that about 18 mg of Cu accumulated in all three provinces. The cadmium (Cd) and lead (Pb) levels were found to be insignificant. The contributions of the vegetables to the daily intake of the heavy metals from the vegetables were determined.

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Sampling and analysis of the air-water interface with SEM and EDS of microlayers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100157000 ◽

1989 ◽

Vol 47 ◽

pp. 1004-1005

Author(s):

Randall W. Smith ◽

John Dash

Keyword(s):

Heavy Metals ◽

Surface Microlayer ◽

Surface Films ◽

Water Interface ◽

Physical Processes ◽

Infrared Spectroscopic Analysis ◽

Eds Analysis ◽

Air Water Interface ◽

Significant Area ◽

Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

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