我国东海大陆架沉积物中有机粘土复合体与某些金属元素富集关系的研究

STUDY OF THE RELATIONSHIP OF METALLIC ELEMENT ENRICHMENT WITH ORGANOCLAY COMPLEXES IN CONTINENTAL SHELF SEDIMENTS IN THE EAST CHINA SEA

Samples of Continetal shelf sediments from the East China Sea have been studied in an attempt to eluciate the relationship of metallie element enrichment with organoclay complexes. Investigations of the distribution patterns and modes of existence of such elements as Cu, Pb, Zn, Ni, Fe, Mn, etc. in the sediments demonstrate that there exist remarkable positive eorrelations between tha distribution of all elements except for Mn,and the content of clay minerals and organic matter and its type. Experimental results show that the removal of combined organic matter will lead to a rapid decrease in the content of these elements (up to mote than 50%). Organoelay chemistry study indicates that the enrichment of metallic elements in the sediments may involve the following processes: (1) the formation of organic metallic complexes by the ineraction between organic matter and metallic ions in the water body; (2) the production of organoclay complexes by the interaction between the organic metallic complexes and clay minerals in the same medium, (3) the deposition of the organoelay complexes due to the variation of water medium conditions during their migration, thus enabling the sediments to be enriched in some metallic elements. From the above, it can be seen that organoclay complexes may be one of the important forms of existense of metallic elements concentrated in the sediments, and also of significance in eluciating the mechanism of fineralization of metallic elements.

Samples of continetal shelf sediments from the East China Sea have been studied inan attempt to eluciate the relationship of metailic elament enrichment with organoclaycomplexes. Investigations of the distribution patterns and modes of existence of suchelements as Cu, Pb, Zn, Ni, Fe, Mn, etc. in the sediments demonstrate that there existremarkable positive correlations between the distribution of an elements except for Mn,and the content of clay minerals and organic matter and its type. Experimental resultsshow that the removal of combined organic matter will lead to a rapid decrease in thecontent of these elements (up to more than 50%). Organoclay chemistry study indi-cates that the enrichment of metallic elements in the sediments may involve the following processes: (1) the formation of organic metallic complexes by the ineraction bet-ween organic matter and metallic ions in the water body; (2) the production of orga-noclay complexes by the interaction between the organic metallic complexes and clayminerals in the same medium; (3) the deposition of the organoclay complexes due tothe variation of water medium conditions during their migration, thus enabling the se-diments to be enriched in some metallic elements. From the above, it can be seen that organoclay complexes may be one of the impor-tant forms of existence of metallic elements concentrated in the sediments and also ofsignificance in eluciating the mechanism of fineralization of metallic elements.