100 Years of Sediment Accumulation History of Organic Halogens and

Research 100 Years of Sediment Accumulation History of Organic Halogens and Heavy Metals in Recipient and Nonrecipient Lakes of Pulping Industry in Finland M I K A A . K A¨ H K O ¨ N E N , * ,† KIMMO P. SUOMINEN,† PENTTI K. G. MANNINEN,‡ AND MIRJA S. SALKINOJA-SALONEN† University of Helsinki, Department of Applied Chemistry and Microbiology, Biocenter, P.O. Box 56, 00014, Finland, and Lahti Research Laboratory, Niemenkatu 73 C, 15210 Lahti, Finland

Rate of sediment accumulation of extractable organic halogen (EOX) and of 12 trace elements (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Sn, V, and Zn) were analyzed retrospectively over 100 years in the recipient area of pulp mills in Lake Saimaa and in two nonrecipient forest lakes in southeastern Finland. The sediments were dated by 210Pb and 137Cs activities. From 1880s to 1940s,