Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 11 3 2025 07 01 Spatial distribution of organochlorine pesticides contamination in the galma river sediment, Nigeria 283 299 1527 10.22104/aet.2025.7267.2010 EN Shamsuddeen Jumande Mohammad Department of Water and Environmental Engineering, School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81300 Johor Bahru, Malaysia Department of Water Resources and Environmental Engineering, Ahmadu Bello University, 1045, Zaria, Kaduna Nigeria Badruddeen Saulawa Sani Department of Water Resources and Environmental Engineering, Ahmadu Bello University, 1045, Zaria, Kaduna Nigeria Khairunnisa Abdulhalim Department of Water and Environmental Engineering, School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81300 Johor Bahru, Malaysia Alamin Danladi Bello Department of Water Resources and Environmental Engineering, Ahmadu Bello University, 1045, Zaria, Kaduna Nigeria Nura Idris Abdullahi Department of Water Resources and Environmental Engineering, Ahmadu Bello University, 1045, Zaria, Kaduna Nigeria Journal Article 2024 12 06 This study investigated chlorinated pesticide contamination in Galma River sediments, Zaria, Nigeria, focusing on its spatial distribution and ecological risks. Despite global bans on many organochlorine pesticides (OCPs), residues persist in Nigerian rivers, posing significant environmental and public health threats. Sediment samples from 10 locations along the river were analyzed using gas chromatography-mass spectrometry (GC-MS), revealing widespread contamination by 18 OCPs. Among these, Hexachlorobenzene (HCB), α-HCH, and Heptachlor epoxide were found in the highest concentrations, with HCB ranging from 46.29 to 167.21 ng/g, α-HCH from 31.56 to 159.4 ng/g, and Heptachlor epoxide peaking at 142.03 ng/g. Ecological risk assessments identified major contamination hotspots at locations P5, P6, and P8, where Heptachlor epoxide concentrations exceeded safe limits, indicating severe risks to aquatic life. Historical pesticide use was evident in P10, where elevated levels of p, p'-DDD and p,p'-DDT were found. Clustering analysis revealed three distinct contamination patterns, highlighting areas requiring urgent remediation. This study highlights the need for better regulation, continuous monitoring, and targeted remediation efforts to mitigate the ongoing risks posed by pesticide contamination in northern Nigeria’s agricultural regions. https://aet.irost.ir/article_1527_a477cbc673304dbb5c9c70b1e0bbbb10.pdf