Pb Accumulation and Its Health Risk in Soil-wheat System of Beijing City Based on Agricultural Location Theory

Urban Farm DB summary

Based on Agricultural Location Theory, 23 matched soil-wheat sample sets were collected from Beijing's central city, suburban plain and exurban plain zones to analyze the accumulation, chemical forms and bioavailability of lead under differing intensities of human activity. Urban soil showed lead contamination with an average concentration of 35.59 mg/kg above the limit, likely from traffic and industrial emissions, and suburban agricultural soil also showed localized lead contamination from long-term sewage irrigation, with lead more mobile in urban agricultural soil than in suburban soil and least mobile in exurban agricultural soil. The average bioconcentration factor of lead in wheat seeds was a low 0.0044, but some lead concentrations in wheat seeds grown in urban and suburban agricultural soil exceeded the standard limit, indicating a potential health risk to residents in those areas.