Overview
This pot experiment evaluated the phytoremediation potential of Brassica juncea and Sorghum bicolor on heavily contaminated soil from an illegal dump site in Southern Italy, with and without different types of compost amendments. Initial soil concentrations exceeded Italian regulatory contamination thresholds for multiple metals.
Key numbers
Initial soil concentrations (Table 1, all above Italian D.Lgs 152/06 thresholds for residential land use):
- lead (Pb): 160 mg/kg
- Cu: 105 mg/kg
- Zn: 326 mg/kg
- cadmium (Cd): 0.690 mg/kg
- chromium (Cr): 23.5 mg/kg
- nickel (Ni): 17.0 mg/kg
- tin (Sn): 18.7 mg/kg
- mercury (Hg): below LOQ (0.002 mg/kg)
- Tl: below LOQ (0.004 mg/kg)
Plant accumulation (global average across all compost treatments):
- Pb in B. juncea plant tissue: 46.18 ± 22.39 mg/kg (dry weight; Figure 3)
- Cu in roots: approximately 35-45 mg/kg DW; shoots: approximately 5-10 mg/kg DW
- Zn in roots: approximately 100-250 mg/kg DW; shoots: approximately 50-130 mg/kg DW
- Pb in roots: approximately 40-50 mg/kg DW; shoots: very low (root-biased)
LOQ values from Table 1: Hg < 0.002 mg/kg, Tl < 0.004 mg/kg.
Methods
Pot experiment; soil from illegal dump site; five compost treatments plus control; B. juncea and S. bicolor harvested; trace elements in soil and plant tissue; Normality checked, significance at p < 0.05.
Implications
This is a phytoremediation study using extremely contaminated soil (Pb 160 mg/kg, Zn 326 mg/kg). It does not represent food safety occurrence. The root-biased accumulation for Pb in B. juncea is consistent with other studies. Compost amendments slightly changed accumulation but did not eliminate metal uptake. The HRI for edible consumption is not applicable since these plants were grown for soil remediation, not food. Routes as mechanism context.
Certification: not in HMT&C threshold pools. Routes to Lead, Cadmium, mitigation/phytoremediation.
App: No contamination_profile blocks are touched.
Microbiome: Not a focus of this source.
Update history
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