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محیط زیست و منابع طبیعی::
حداکثر سطح مجاز
The concentrations of Pb, Cr, Cd, and As were compared with the maximum permissible level (MPL) of contaminants recommended for fresh leafy vegetables in China [39]: 0.3 mg/kg for Pb,
The maximum permissible level of Ni is 0.3 mg/kg [40].
The As concentration in leafy vegetables was minimum and far below the MPL, and this coordinated with the low bioavailability of As [41].
0.07 mg/kg to 0.39 mg/kg, and the average Pb content in cow soapwort was 1.3 times higher than its respective MPL.
All vegetable samples exceeded the MPL for Cr, with the highest (4.7 mg/kg) in cow soapwort followed by (3.3 mg/kg) garlic sprout.
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