Concentrations of Some Trace Elements in Vegetables Sold at Maun Market, Botswana

Bati, Keagile; Mogobe, Oarabile; Masamba, W.R.L.

doi:10.5539/jfr.v6n1p69

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…The presence of Zn in the vegetables could be associated with the use of wastewater for irrigation, contaminated soil and fertilizers and pesticides used in vegetable growing. Results in this study indicated lower zinc levels when compared with those recorded in a previous study (23.8 -89.8 mg/kg) carried out in Maun market, Botswana (Bati et al, 2016). Lower values of Zn (3.77 -16.3 mg/kg) than those obtained in this study were reported in a previous study in Banat County, Romania (Harmanescu et al, 2011).…”

Section: Resultscontrasting

confidence: 58%

Heavy metal concentrations in vegetables cultivated and sold in Machakos Municipality, Kenya

Tomno¹,

Kitulu²,

Nzeve³

et al. 2021

jasem

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Heavy metal contamination of vegetables is a key aspect of food quality assurance since vegetables form a substantial proportion of the daily human diet. Health risks in urban populations due to exposure to heavy metals are on the increase because of the consumption of vegetables irrigated with wastewater. This study analyzed the concentration of Cd, Cu, Pb, Zn and Cr in spinach and kales grown using contaminated water of the Mitheu urban stream and those sold within Machakos municipality. Vegetable samples were collected once per month for a period of four months starting from June to September 2019. The mean heavy metal concentrations obtained were0.013 – 3.19 mg/kg, 0.468 – 1.706 mg/kg, 0.02 – 0.368 mg/kg, 5.78 – 26.7 mg/kg, and 0.104 – 14.0 mg/kg for Cd, Cu, Pb, Zn and Cr respectively in kale samples from the different sampling sites. The heavy metal mean concentrations in spinach were 0.055 – 0.575 mg/kg, 3.79 – 5.55 mg/kg, 0.098 – 1.49 mg/kg, 8.32 – 20.7 mg/kg and 0.368 – 4.43 mg/kg for Cd, Cu, Pb, Zn and Cr respectively. The mean concentrations of Cd, Pb, Zn and Cr in both spinach and kales in some of the sampling sites were above WHO permissible levels for heavy metals in vegetables for human consumption. However, the mean concentration of Cu was below WHO recommended levels. Consumption of these vegetables therefore poses a health risk to the consumers. There is need to create public awareness on the dangers of consuming contaminated vegetables. Additionally, measures to curb heavy metal pollution in Mitheu stream should be taken by the County Government of Machakos.

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Section: Resultscontrasting

confidence: 58%

Heavy metal concentrations in vegetables cultivated and sold in Machakos Municipality, Kenya

Tomno¹,

Kitulu²,

Nzeve³

et al. 2021

jasem

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“…According to Kabata-Pendias and Mukherjee (2007) manganese content in tuber dry matter ranges from 4 to 15 mg kg -1 , in research by Sawicka et al (2016) and Bati et al (2017) the respective ranges were 6.3-17.3 and 17.2 mg kg -1 , and in the studies by Mahamud et al (2015) conducted in USA and Bangladesh it was significantly affected by the cultivar and ranged from 7.4 to 50.6 mg kg -1 . In the experiment reported here, the tuber content of manganese was from 20.01 to 22.02 mg kg -1 and was significantly influenced by cultivars, herbicides applied alone or combined with biostimulants as well as moisture and thermal conditions during the study period ( Table 7).…”

Section: Manganese Content and Uptakementioning

confidence: 96%

Iron and manganese content and uptake with the yield of potato tubers as affected by herbicides and biostimulants, and potato tuber nutritional value

Gugała¹,

Zarzecka²,

Mystkowska³

et al. 2019

Emir J Food Agric

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The study material consisted of table potato tubers produced in a three-year field experiment. The following factors were examined: three potato cultivars – Bartek, Gawin and Honorata, five herbicide application methods: herbicides alone (Harrier 295 ZC and Sencor 70 WG) and mixed with growth regulators (Harrier 295 ZC + Kelpak SL, Sencor 70 WG + Asahi SL), and a control unit where weeds were mechanically controlled. The objective of the study was to assess the effect of herbicides and their mixtures with growth regulators on potato tuber nutritive value as well as iron and manganese contents and uptake with the yield of potato tubers. Iron and manganese contents of tubers and uptake with tuber yield were significantly affected by cultivars, herbicides and biostimulants applied as well as weather conditions during the growing season. The herbicides and biostimulants increased iron and manganese contents and uptake with the yield of potato tubers compared with control tubers. The highest amounts of the examined microelements were accumulated by cv. Honorata compared with cv. Bartek and Gawin. Consumption of 100 g potato tubers in 9 and 21% satisfied the daily requirement for iron and manganese, the daily requirements in the human diet being 14.0 and 2.0 mg, respectively.

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“…That observation is related to the pillars of ecological agriculture -no use of industrialized fertilizers and pesticides (which constitute typical sources of As contamination) (Bati et al 2017).…”

Section: Trace Elements In Biomassesmentioning

confidence: 99%

“…França et al (2017) reported a signi cant increase in Cd, Pb, Ni and Zn concentrations in plants growing in the metropolitan region of Recife City, Pernambuco State, Brazil. Those authors noted that the high levels of those elements in plants were related to particulate emissions in the atmosphere that spread those contaminants to the air, water, and cultivated soils(França et al 2017), as they can be such as organic matter and chemical fertilization and/or through the use of agrochemicals (fertilizers and agricultural defensive products)(Bati et al 2017;Radulescu et al 2013). The constant monitoring of trace elements in plant material derived from urban gardens will therefore be necessary to minimize public health risks(Alfaro et al 2017).…”

mentioning

confidence: 99%

Trace Elements and Security of Foods Produced in Urban Community Gardens, Curitiba, PR, Brazil

Barbato

Maranho

Gomes

2022

Preprint

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Urban gardens have emerged as a new global tendency for supporting food security, and has therefore become the focus of diverse studies and attracted the attention of public administrations as an option for sustainable food production. Vegetable crops cultivated under conditions of high exposure to contaminants found in large urban centers, however, tend to accumulate toxic compounds, such as, trace elements, and insert them into human foods and the trophic chain. We therefore evaluated the food security of vegetables (lettuce and collard greens) produced in urban gardens in the Metropolitan region of Curitiba City (Brazil) in terms of the presence of trace elements. Assays were performed in plants harvested from four urban gardens as well as an agroecology site (control). We also assayed for trace elements in the garden soils and the irrigation water used for their production. Both the soils and the irrigation waters had trace element concentrations within the maximum recommended limits, and were therefore not vehicles of contamination. Similarly, trace element concentrations identified in the biomasses of lettuce and collard greens plants grown in the control area, as well as the four urban gardens, were below the maximum limits recommended for leafy vegetables. The vegetables produced in the urban gardens and the agroecology area are considered safe for human consumption.

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Concentrations of Some Trace Elements in Vegetables Sold at Maun Market, Botswana

Cited by 11 publications

References 18 publications

Heavy metal concentrations in vegetables cultivated and sold in Machakos Municipality, Kenya

Heavy metal concentrations in vegetables cultivated and sold in Machakos Municipality, Kenya

Iron and manganese content and uptake with the yield of potato tubers as affected by herbicides and biostimulants, and potato tuber nutritional value

Trace Elements and Security of Foods Produced in Urban Community Gardens, Curitiba, PR, Brazil

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