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| Mbangi, Awonke, Muchaonyerwa, Pardon and Zengeni, Rebecca Accumulation of multiple heavy metals in plants grown on soil treated with sewage sludge for more than 50 years presents health risks and an opportunity for phyto-remediation. Water SA, Oct 2018, vol.44, no.4, p.569-576. ISSN 1816-7950
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