قارن الطرق

	تحديد الأنواع الكيميائية للمعادن الثقيلة	تقييم الأثر البيئي
المجال	الهندسة البيئية	الهندسة البيئية
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1979	1970
صاحب الطريقة	Tessier and hydrogeochemists	U.S. National Environmental Policy Act (NEPA)
النوع	analytical and geochemical modeling pipeline	systematic assessment and decision-support pipeline
المصدر التأسيسي	Tessier, A., Campbell, P. G. C., & Bisson, M. (1979). Sequential Extraction Procedure for the Speciation of Particulate Trace Metals. Analytical Chemistry, 51(7), 844–851.	Glasson, J., Therivel, R., & Chadwick, A. (2005). Introduction to Environmental Impact Assessment (3rd ed.). Routledge. ISBN: 978-0415303910
الأسماء البديلة	metal speciation, metal partitioning, bioavailability assessment, speciation analysis	EIA, impact assessment, environmental screening, cumulative effects assessment
ذات صلة	3	4
الملخص	Heavy metal speciation is the analytical and geochemical determination of the chemical forms (species) and partitioning of toxic metals (lead, cadmium, chromium, zinc, copper) in soil, sediment, and water. Metal bioavailability—the fraction accessible to organisms—depends critically on speciation: metal bound to soil organic matter or iron oxides is immobile and non-bioavailable; dissolved or exchangeable metal is highly bioavailable and toxic. Speciation assessment informs remediation design, risk assessment, and contaminant fate prediction.	Environmental Impact Assessment (EIA) is a systematic, structured process to identify, predict, and evaluate the environmental and social consequences of proposed development projects (infrastructure, extraction, manufacturing) before implementation. Mandated by law in most jurisdictions since the 1970s (NEPA in USA, EU Directive 2011/92/EU), EIA integrates scientific analysis of air quality, water resources, biodiversity, noise, and socioeconomic effects with stakeholder consultation and decision-making frameworks to inform project approval, design modification, or rejection.