Abubakar and colleagues measured seven metals in sewage water, soil, spinach and cauliflower at two peri-urban sites in Faisalabad, Pakistan. The paper reports substantial differences between the two crop/site combinations, but its design does not separate plant-species effects from location. Concentrations are retained with the source’s measurement and tissue limitations.
Key numbers
Site I is Ghulam Muhammad Abad and Site II is Chokera. Figure 4 identifies three replicates; its caption supplies mg/L for water and mg/kg for soil and vegetables. The numerical means are printed in Results 3.5 (PDF pp. 6–7). The plant-metal method uses dried leaf material.
| Matrix and site | Cd | Co | Pb | Cr | tHg | Cu | Ni |
|---|---|---|---|---|---|---|---|
| Site I water | 0.17 | 0.72 | 1.07 | 1.79 | 1.38 | 2.66 | 0.55 |
| Site II water | 0.50 | 0.66 | 0.87 | 1.23 | 1.92 | 3.21 | 0.87 |
| Site I soil | 1.67 | 3.94 | 2.96 | 4.39 | 5.61 | 4.10 | 7.43 |
| Site II soil | 2.36 | 6.09 | 5.39 | 5.85 | 4.64 | 2.93 | 5.56 |
| Site I spinach | 3.58 | 4.71 | 6.13 | 9.43 | 3.83 | 3.11 | 4.77 |
| Site II cauliflower | 3.92 | 5.55 | 7.76 | 5.71 | 1.94 | 2.51 | 2.68 |
The source reports spinach CAT/POD activities of 81/125 and cauliflower activities of 142/60 Units/g fresh weight (Results 3.4). These biochemical endpoints remain separate from metal concentrations.
Methods (brief)
Water, surface soil and vegetables were collected at the two sewage-irrigated sites. The text describes spinach above-ground material and cauliflower heads with associated leaves, while the metal method specifically digests 0.2 g dried leaves in sulfuric acid and hydrogen peroxide. Vegetables were dried at 60°C for 24 hours for dry-weight analysis. Co, cadmium (Cd), chromium (Cr), lead (Pb), Cu, nickel (Ni) and mercury (Hg) were measured with an iCAP-6300 Duo ICP-OES. The source uses ANOVA and an LSD comparison at 5%, with figure error bars described as SD for three replicates. Sampling dates, analytical LODs, recoveries and certified reference materials are not provided.
Implications
These are localized paired environmental and crop measurements, with plant results routed as leafy-tissue evidence. They do not establish a cauliflower-head concentration, a fresh-weight concentration, or a causal reduction in biomass from metal exposure. Industrial source attribution is proposed by the authors, rather than measured by a source-apportionment experiment.
Evidence Fitness: EF-3; source-reported occurrence summaries with crop/site confounding, unresolved cauliflower tissue composition and analytical reporting gaps. Water and soil values remain upstream context.
Related evidence
- Leafy / Green Vegetables, Other
- Spinach
- Cauliflower
- Irrigation water and soil amendments as anthropogenic inputs to cropland
- Cadmium
- Cobalt
- Lead
- Chromium
- Mercury, Total
- Copper
- Nickel
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