Suanon, F.F.SuanonChi, Q.Q.ChiYang, X.X.YangWang, H.H.WangRashid, A.A.RashidAsefi, B.B.AsefiMama, D.D.MamaYu, C.-P.C.-P.YuSun, Q.Q.SunCHANG-PING YU2020-02-252020-02-252018https://scholars.lib.ntu.edu.tw/handle/123456789/462722Limited information about the sludge quality is a major constraint for its usage and proper disposal. This study investigated the occurrence of 49 elements in sludge from 11 wastewater treatment plants (WWTPs) in Chongqing and Xiamen cities of China. The concentration of 46-detected elements ranged from 16.2 μg kg−1 (Pt) to 55.0 g kg−1 (Al) on dry solid basis in the sludge. The enrichment factor of most of the elements was > 1.5, indicating their possible anthropogenic origin. The precious metals had considerably higher enrichment factor ranging from 56.3 to 200,000. Principal component analysis clustered the samples from Chongqing and Xiamen separately to suggest strong spatial variations. Contamination factor, pollution loading index, and integrated pollution degree were calculated to evaluate the elemental pollution risk. The pollution loading index indicated unpolluted to highly polluted levels of the elements in the sludge. In addition, results from the ecotoxicological risk index showed an individual low to very high ecotoxicological risk posed by eight metal(loid)s (As, Cd, Cr, Cu, Mn, Ni, Pb, and Zn) in the WWTPs. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.Ecotoxicological risk; Elements; Pollution indices; Sludge[SDGs]SDG3[SDGs]SDG6[SDGs]SDG11chemical element; concentration (composition); detection method; ecotoxicology; human activity; index method; risk assessment; sludge; spatial variation; waste disposal; wastewater treatment; wastewater treatment plant; China; Chongqing; Fujian; Xiamen; heavy metal; metal; analysis; chemistry; China; city; ecotoxicology; principal component analysis; procedures; risk assessment; sewage; toxicity; water pollutant; China; Cities; Ecotoxicology; Metals; Metals, Heavy; Principal Component Analysis; Risk Assessment; Sewage; Waste Disposal, Fluid; Water Pollutants, Chemicaljournal article10.1007/s11356-018-2888-z2-s2.0-85052214568https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052214568&doi=10.1007%2fs11356-018-2888-z&partnerID=40&md5=5d9cefbd67c23d8a40df122cc97bc5c3