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Da: Forgotten Books, London, Regno UnitoForgotten Books
Contatta il venditoreVenditore con 4 stelleCondizione: Nuovo
EUR 15,74
Spedizione gratuitaSpedito da Regno Unito a U.S.A.Quantità: Più di 20 disponibili
Paperback. Condizione: New. Print on Demand. This book presents the findings of a geochemical investigation into the composition of bottom sediments from three Southern Illinois lakes. Chemical data for eleven major and minor constituents, ten trace elements and the less-than-two micrometer clay content were obtained for 150 sed…iment cores collected from these lakes. The less-than-two micrometer clay-size fraction was determined by the pipet method. The sediments from Lake Du Quoin and Johnston City Lake have a high clay content in the upper portions of the bottom sediment cores and a low clay content in the lower portions with a definite transition point demonstrated in twelve of fourteen cores. Above this transition point, copper and zinc have maximum concentrations of 476 and 252 ppm, respectively, in Lake Du Quoin and maximum concentrations of 238 and 259 ppm, respectively, in Johnston City Lake. Copper and zinc have been contributed from external sources. The lower portions of the cores from these two lakes and the entire cores from Little Grassy Lake are chemically similar to sediment samples from ancient (Wisconsinan and Holocene) Lake Saline. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.
