Cadmium (Cd) and Lead (Pb) concentrations (mg/kg) in edible plants from the study area: Seasonal variation (summer vs. winter) vs. FAO/WHO Codex maximum levels (MLs)
| Sites | Summer season | Winter season | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Plant | Cd | Limits* | Pb | Limits | Plant | Cd | Limits | Pb | Limits | |
| 1 | Maize stalks | 1.20 | – | 6.90 | – | Wheat grains | 0.30 | 0.2 | 6.70 | 0.2 |
| 2 | Maize grains | 0.06 | 0.1 | 0.66 | 0.2 | Onion bulb | 0.56 | 0.1 | 5.30 | 0.1 |
| 3 | Eggplant fruits | 0.14 | 0.05 | 6.76 | 0.1 | Clover | 0.30 | – | 6.50 | – |
| 4 | Sesame plant | 0.28 | 0.1 | 4.38 | 0.2 | Onion bulb | 0.60 | 0.1 | 5.70 | 0.1 |
| 5 | Molokheya leaves | 0.44 | 0.2 | 6.60 | 0.3 | Wheat grains | 0.30 | 0.2 | 7.40 | 0.2 |
| 6 | Rice grains | 0.60 | 0.4 | 4.80 | 0.2 | Turnip plant | 1.00 | 0.2 | 8.3 | 0.1 |
| 7 | Maize grains | 0.31 | 0.1 | 2.80 | 0.2 | Cabbage leaves | 0.30 | 0.2 | 1.10 | 0.3 |
| 8 | Rice grains | 0.24 | 0.4 | 5.90 | 0.2 | Beans grains | 0.30 | 0.1 | 5.90 | 0.2 |
| Sites | Summer season | Winter season | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Plant | Cd | Limits* | Pb | Limits | Plant | Cd | Limits | Pb | Limits | |
| 1 | Maize stalks | 1.20 | – | 6.90 | – | Wheat grains | 0.30 | 0.2 | 6.70 | 0.2 |
| 2 | Maize grains | 0.06 | 0.1 | 0.66 | 0.2 | Onion bulb | 0.56 | 0.1 | 5.30 | 0.1 |
| 3 | Eggplant fruits | 0.14 | 0.05 | 6.76 | 0.1 | Clover | 0.30 | – | 6.50 | – |
| 4 | Sesame plant | 0.28 | 0.1 | 4.38 | 0.2 | Onion bulb | 0.60 | 0.1 | 5.70 | 0.1 |
| 5 | Molokheya leaves | 0.44 | 0.2 | 6.60 | 0.3 | Wheat grains | 0.30 | 0.2 | 7.40 | 0.2 |
| 6 | Rice grains | 0.60 | 0.4 | 4.80 | 0.2 | Turnip plant | 1.00 | 0.2 | 8.3 | 0.1 |
| 7 | Maize grains | 0.31 | 0.1 | 2.80 | 0.2 | Cabbage leaves | 0.30 | 0.2 | 1.10 | 0.3 |
| 8 | Rice grains | 0.24 | 0.4 | 5.90 | 0.2 | Beans grains | 0.30 | 0.1 | 5.90 | 0.2 |
Note(s): *Maximum allowable limits (Maximum Levels, MLs) for Heavy Metals in Food Crops based on the FAO/WHO Codex Alimentarius (General Standard for Contaminants and Toxins in Food and Feed, CODEX STAN 193–1995). These limits apply to key heavy metals of concern: Lead (Pb), Cadmium (Cd), Arsenic (As), and Mercury (Hg). The FAO/WHO Codex Alimentarius does not set international Maximum Levels (MLs) for Fe, Mn, Zn, Cu, Co, Ni, or Cr in food crops due to scientific, nutritional, and risk-based principles
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