Concentrations of arsenic, copper, cobalt, lead and zinc in cassava (Manihot esculenta Crantz) growing on uncontaminated and contaminated soils of the Zambian Copperbelt

Křı́bek, Bohdan; Majer, Vladimı́r; Knésl, Ilja; Nyambe, Imasiku; Mihaljevič, Martin; Ettler, Vojtěch; Šráček, Ondra

doi:10.1016/j.jafrearsci.2014.02.009

Cited by 51 publications

(18 citation statements)

References 27 publications

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“…Concentrations of lead in Chinese cabbage shoots (Figures and ) are equivalent or higher to the concentrations that Chinese cabbage and other similar leafy vegetables have been shown to take up from lead contaminated soils in other studies . Chinese cabbage grown in soils with higher concentrations (>400 mg kg −1 ) reached the maximum accumulation concentration at four weeks and decreased to a slightly lower concentration at eight weeks (Figure ).…”

Section: Discussionmentioning

confidence: 52%

The Effects of Lead Species and Growth Time on Accumulation of Lead in Chinese Cabbage

Corley

Mutiti

2017

Global Challenges

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A major pathway for heavy metal exposure in contaminated areas is via consumption of locally produced food. This study investigated the accumulation of lead in Chinese cabbage grown in contaminated soils and estimated the weekly dietary intake. Experiments were conducted to determine the effects of different growth times, concentrations, and lead species (carbonate, nitrate, and sulfide) on the uptake of lead in shoots. Results show that Chinese cabbage accumulated up to 38 mg kg −1 in the shoots. There was a significant difference in lead uptake by plants grown in soils with 400 mg kg −1 (Upper Critical Limit: UCL) and those grown in 600 mg kg −1 (Above Critical Limit: ACL) lead concentrations. However, there was no significant difference in the ACL shoots despite the different growth period. The cabbages grown for eight weeks (at UCL) had four times more lead than those grown for four weeks. The elemental form also affected lead uptake with the lead sulfide (mineral form) having the least uptake and lead carbonate (solution) having the highest. Calculated weekly dietary intake levels of lead were higher (above 0.28 mg kg −1 per human body weight) than the recommended levels for human consumption (0.025 mg kg −1 per human body weight).

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Section: Discussionmentioning

confidence: 52%

The Effects of Lead Species and Growth Time on Accumulation of Lead in Chinese Cabbage

Corley

Mutiti

2017

Global Challenges

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“…They also observed that metal concentrations in the cassava strongly depended on the concentration in the soil and that the concentrations varied between the different parts of the plant as observed by Mombo et al (2016). Similarly, Kříbek et al (2014) also reported higher concentrations of various metals (Cu, Co, Zn, As, and Pb) in cassava leaves than in stems and roots. Concentration of these metals in leaves was also higher than their concentrations in the soil.…”

Section: Plant Contamination By Metallic Trace Elements and Phytotoximentioning

confidence: 76%

A socio-scientific analysis of the environmental and health benefits as well as potential risks of cassava production and consumption

Mombo

Dumat

Shahid

et al. 2016

Environ Sci Pollut Res

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Due to its high adaptability, cassava (Manihot esculenta Crantz) is one of the world's most cultivated and consumed plants after maize and rice. However, there are relatively few scientific studies on this important crop. The objective of this review was therefore to summarize and discuss the available information on cassava cropping in order to promote sustainable practices in terms of production and consumption. Cassava cultivation has been expanding recently at the global scale and is widely consumed in most regions of South America, Africa, and Asia. However, it is also characterized by the presence in its roots of potentially toxic hydrocyanic acid. Furthermore, cassava can also absorb pollutants as it is currently cultivated near roads or factories and generally without consideration for potential sources of soil, water, or atmospheric pollution. Careful washing, peeling, and adequate preparation before eating are therefore crucial steps for reducing human exposure to both environmental pollutants and natural hydrocyanic acid. At present, there is not enough precise data available on this staple food crop. To improve our knowledge on the nutritive benefits versus health risks associated with cassava consumption, further research is necessary to compare cassava cultivars and precisely study the influence of preparation methods.

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“…Eqs. (9) and (10) indicate that variation of initial concentration and volume of both investigated complexing agents had an effect on final pH. The negative signs of the corresponding coefficients denote that increased concentration levels and increased levels of applied volume influenced the decrease in pH.…”

Section: Evaluation Of the Effects Of Factors By Box-behnken Designmentioning

confidence: 97%

“…In north greater Cairo (Egypt), direct discharge of industrial wastewaters to irrigation water canals during 30 years provoked significant contamination of soil with Co (146 mg/kg) [9]. The activity of a smelter in Zambia was found to result in dust with elevated concentrations of Co and other heavy metals, causing the contamination of soil and plants [10]. The highest measured Co concentration was 606 mg/kg found in the 0-2 cm of soil depth [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Factors Affecting Chemical Extraction of Co Ions from Contaminated Soil

Smičiklas¹

2018

Statistical Approaches With Emphasis on Design of Experiments Applied to Chemical Processes

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Excessive concentrations of cobalt (Co) ions in the soil cause quality degradation and pose a significant hazard to biota. One of the options for the permanent separation of the pollutant from soil matrix is extraction by chemical reagents. In this study, responsesurface methodology (RSM) was applied to evaluate the factors affecting Co extraction from contaminated calcareous soil. Solutions of disodium ethylenediaminetetraacetate (Na 2 EDTA), citric acid (CA), and HCl were considered as leaching media. Reagent concentration, soil to solution ratio, and extraction time were selected as process variable, while Co extraction efficiencies and final pH values of extracts were the measured responses. The effect of factor variation between three levels was studied using Box-Behnken experimental design. By statistical analysis, the most influential factors were determined for each reagent, and the model equations were proposed for the prediction of system responses. Overlaid contour plots were used for the analysis of the effect of process conditions on both responses simultaneously. Given that each case of contamination is unique and requires extensive research before the remediation is implemented full-scale, it was shown that experimental design methodology is a smart approach for the assessment and comparison between the treatments.

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Concentrations of arsenic, copper, cobalt, lead and zinc in cassava (Manihot esculenta Crantz) growing on uncontaminated and contaminated soils of the Zambian Copperbelt

Cited by 51 publications

References 27 publications

The Effects of Lead Species and Growth Time on Accumulation of Lead in Chinese Cabbage

The Effects of Lead Species and Growth Time on Accumulation of Lead in Chinese Cabbage

A socio-scientific analysis of the environmental and health benefits as well as potential risks of cassava production and consumption

Evaluation of Factors Affecting Chemical Extraction of Co Ions from Contaminated Soil

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