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Bien Aimé Ndongala, Fiston Masikini, Hervé Kawita, Valentin Ikoli, Stany Belanga, Christevie N’sungu, Jacques Henry Bomoi and Thierry Tangou 2026. Heavy metal contamination (PB, CD, AS, CR) in NPK 17-17-17 fertilizers marketed in Kinshasa, Democratic Republic of the Congo: regulatory compliance, health and environmental risk assessment. International Journal of Scientific Research and Innovative Studies. 5, 4 (Aug. 2026), 927–938. DOI:https://doi.org/10.63883/ijsrisjournal.v5i4.916.