Geochemical fractions and modeling adsorption of heavy metals into contaminated river sediments in Japan and Thailand determined by sequential leaching technique using ICP-MS

摘要: Abstract In order to provide information on the chemical processes in sediment fractions and their adsorption models, we investigated contaminated sediments of Sumida River Tokyo, Japan Chao Phraya Bangkok, Thailand. Samples were leached through a sequential leaching technique perform metal concentration analysis for fraction assessment then samples tested model highest level by heavy metals using isotherm Langmuir Freundlich equations. Metal (Pb, Cd, Zn, As, Cu, Ca, Fe, Mn) solutions was analyzed Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The pattern geochemical both showed maxima levels Cd (38.6 %), Ca (55.2%), Mn (41.3%) soluble fraction; Pb (52.1%), Zn (56.7%) reducible Cu (61.2%) oxidizable As (47.1%) Fe (55.9%) residual fraction. total (62.6 ppm), (240 ppm), (27.2 ppm), (16,636 ppm) (419 ppm) higher compared those River, indicating high anthropogenic effect Bangkok. most sediments, capacity concentrations contributed SiO2, CaCO3, Al2O3 determined X-ray diffraction organic contents. fitted linear form Langmuir’s equation with correlation coefficients (r2 = 0.94), b (0.467) k (7137), whereas Pb, Cr, conformed equation.