Uptake and translocation of heavy metals by medicinal plants growing around a waste dump site in Pretoria, South Africa

Olowoyo, Joshua Oluwole; Okedeyi, O. O.; Mkolo, Nqobile Monate; Lion, Gladness Nteboheng; Mdakane, S. T.R.

doi:10.1016/j.sajb.2011.05.010

Cited by 70 publications

(45 citation statements)

References 17 publications

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“…The acidic nature of the soils may influence the mobility and the bioavailability of trace metals in the soil [27]. The soil pH may sometimes be a reflection on the product of contamination, which may further explain the sources of contamination in our study [28].…”

Section: Discussionmentioning

confidence: 97%

Trace Metals in Soil and Plants around a Cement Factory in Pretoria, South Africa

Olowoyo¹

2015

Pol. J. Environ. Stud.

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Section: Discussionmentioning

confidence: 97%

Trace Metals in Soil and Plants around a Cement Factory in Pretoria, South Africa

Olowoyo¹

2015

Pol. J. Environ. Stud.

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“…Humans exposed to them can have biochemical (enzyme changes, changes of biomolecules and transport of essential substances) and physiological changes, such as cancers and fetal abnormalities (Nollet, 2007;Chen et al, 2009;Jang et al, 2008;Lucilene et al, 2006). This heavy metal contamination arising from "dumping ground" is reported by several authors; Olowoyo et al (2012) observed the contamination of vegetable by Fe>Mn>Zn in South Africa; Opaluwa et al (2012) indicated the contamination of soil and plants (As, Cd, Co and Cu) in Nigeria; Liu et al (2013) showed the contamination of areas near garbage dumps by Cd> Cu> Cr> Zn>Pb in China. The municipality of Araguatins, TO, located in the Amazon region (IBGE, 2014) experienced improper disposal of solid waste in a landfill located at 3 km from the city (5° 36'7.29 "S / 48° 5'7.88" W) ( Figure 1).…”

Section: Introductionmentioning

confidence: 69%

Determination of heavy metals in landfill area in Tocantins, Brazil

Oliveira¹,

GalvÃ£o²,

Kramer³

et al. 2017

Sci. Res. Essays

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Section: Trace Metals Uptake Mechanism By Plantsmentioning

confidence: 99%

“…60 It is believed that trace metals can help plants protect themselves from diseases and biological stress. 65,66 If a metal becomes more toxic to a pathogen than to the plant, the metal can hamper the virulence of the pathogen and can increase the resistance of the plant to the biotic stress 65 January/February 2016 metals found in the plant after the pathogen has been suffocated will then be redirected to normal growth.The production of high levels of reactive oxygen species can adversely affect the plant. Therefore, plants have developed a defensive mechanism that involves glutathione in the detoxification of reactive oxygen species through the ascorbate-glutathione cycle.…”

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confidence: 99%

Urban farming as a possible source of trace metals in human diets

Olowoyo¹,

Lion²

2016

S. Afr. J. Sci.

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HOW TO CITE:Olowoyo JO, Lion GN. Urban farming as a possible source of trace metals in human diets. S Afr J Sci. 2016;112(1/2), Art. #2014-0444, 6 pages. http://dx.doi.org/10. 17159/ sajs.2016/20140444 Rapid industrialisation and urbanisation have greatly increased the concentrations of trace metals as pollutants in the urban environment. These pollutants (trace metals) are more likely to have an adverse effect on peri-urban agriculture which is now becoming a permanent feature of the landscape of many urban cities in the world. This review reports on the concentrations of trace metals in crops, including leafy vegetables harvested from different urban areas, thus highlighting the presence of trace metals in leafy vegetables. Various pathways of uptake of trace metals by leafy vegetables, such as the foliar and roots, and possible health risks associated with urban faming are discussed and various morphological and physiological impacts of trace metals in leafy vegetables are described. Defensive mechanisms and positive aspects of trace metals in plants are also highlighted. IntroductionUrban farming can be defined as the act of cultivating food crops, mostly vegetables, wherever land is available around or in the immediate vicinity of a major city.1,2 Farming activities around urban areas have become a prominent feature of some urban city landscapes, especially in developing countries. 3 There are several reasons for farming activities around peri-urban areas and these include easy access to markets and transportation of goods. In some countries, poor urban households use urban farming to increase their household income by selling the yield or surplus to reduce part of daily expenses. 4 The other probable reason for the increase in urban farming is the shortage of land. This involves farming areas previously used for either household or industrial waste, 5 supported by the notion that the soil will be very fertile. Urban farming also supports the campaign for organic farming. Consumers, in most cases, evaluate quality of leafy vegetables on their dark green colour and on size of the leaves as opposed to where farming activities have taken place. 6 However, in urban city centres where farming activities are carried out around industrial areas, safety around the consumption of these vegetables cannot be guaranteed because various disposal practices often cause the accumulation of potentially toxic trace elements in the soil. 7,8 Anthropogenic activities such as mining, emissions from vehicles, wrong agricultural practices and improper waste disposal are major sources of trace metal pollution in the urban environment. 5,9 It was recently discovered that a large percentage of toxic trace metals find their way into the human diet through consumption of vegetables and agricultural products. 5-14In acceptable limits, trace metals play an important role in the health and physiological activities of plants, animals and humans.15 They are required in minute quantities as natural components of the environment. For exa...

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Uptake and translocation of heavy metals by medicinal plants growing around a waste dump site in Pretoria, South Africa

Cited by 70 publications

References 17 publications

Trace Metals in Soil and Plants around a Cement Factory in Pretoria, South Africa

Trace Metals in Soil and Plants around a Cement Factory in Pretoria, South Africa

Determination of heavy metals in landfill area in Tocantins, Brazil

Urban farming as a possible source of trace metals in human diets

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