Spatial Distribution, Source Apportionment, and Source-Specific Ecological Risk Assessment of Heavy Metals in Farmland Soils of the Ningxia Yellow River Irrigation Area
To characterize heavy metal accumulation, potential sources, and source-specific ecological risks in farmland soils of the Ningxia Yellow River Irrigation Area, 537 topsoil samples were analyzed for As, Hg, Cd, Pb, and Cr. positive matrix factorization (PMF) was coupled with the potential ecological risk index to quant...