Mineral phases of metals in industrial sediments of St. Petersburg rivers with extreme pollution

The aim of the research was to determine patterns distribution metals and their main mineral phases in technogenic bottom sediments St. Petersburg watercourses conditions extreme pollution. objects were Yekaterinofka, Okhta, Krasnen'kaya, Smolenka, Karpovka Chernaya Rechka Rivers. Bottom urbanized rivers are characterized by abnormally high concentrations metalloids (TMM). maximum metal content established river corresponds ore concentrations: Cu — 0.487 %, Pb 5.54 Co 0.129 Cd 0.0439 % (0.01–5.0), Ba 6.32 Zn 0.818 %. According Geoaccumulation Index (Igeo), TMMs from moderate severe pollution (Cr, Co, Ni, Zn, As) extremely (Cu, Cd, Sb, Hg). have own geochemical specialization sediments: Okhta River is highest Ba, As, Hg; Ekaterinofka Cr, Mn, Pb, Cd; Smolenka Cu; Red Fe, V, Sc; Ni. Based on method components factor analysis, paragenetic associations identified that indicate sources pollution: production batteries using Sb-Cd-Pb-Co-Mn (Yekaterinofka River) Ni (Karpovka River), paints varnishes Ba-Hg-As-Zn (Okhta processing Cu-Cr (Yekaterinofka, Rivers). Scanning electron micrographs studies showed a variety authigenic minerals, among which barite, hematite, magnetite, goethite primary importance. amount barite formed proportional concentration sediments. There sulfides, framboidal pyrite, sphalerite, chalcopyrite, galena. An important feature early diagenetic changes composition under studied shown formation native (Fe, Pb) aggregates complex Cu). This probably one significant mechanisms flow sustainable technogenesis.