『Abstract
The results of experimental studies of ion exchange properties
of manganese and iron minerals in micronodules (MN) from diverse
bioproductive zones of the World Ocean are considered. It was
found that the sorption behavior of these minerals is similar
to that of ore minerals from ferromanganese nodules (FMN) and
low-temperature hydrothermal crusts. The exchange complex of minerals
in the MN includes the major (Na+, K+, Ca2+,
Mg2+, and Mn2+) and the subordinate (Ni2+,
Cu2+, Co2+, Pb2+, and others)
cations. Reactivity of these cations increases from Pb2+
and Co2+ to Na+ and Ca2+. Exchange
capacity of MN minerals increases from the alkali to heavy metal
cations. Capacity of iron and manganese minerals in the oceanic
MN increases in the following series: goethite＜goethite＋birnessite＜todorokite＋asbolane-buserite＋birnessite＜asbolane-buserite＋birnessite＜birnessite＋asbolane-buserite＜birnessite＋vernadite≒Fe-vernadite＋Mn-feroxyhyte.
The data obtained supplement the available information on the
ion exchange properties of oceanic ferromanganese sediments and
refine the role of sorption processes in the redistribution of
metal cations at the bottom (ooze) water-sediment interface during
the MN formation and growth.』
Introduction
Methods
Characteristics of the starting material
Results and discussion
Composition of the exchange complex of minerals
Exchange capacity of minerals
Dependence of capacity on the mineral composition of micronodules
Dependence of the capacity of minerals on their proportions
in micronodules
Dependence of mineral capacity on the MnO2
content in micronodules
Dependence of the capacity of manganese minerals on the nature
of absorbed metal ion
Dependence of the capacity of manganese minerals on the concentration
of salt metal solutions
Dependence of the capacity of manganese minerals on the size
of micronodules
Dependence of mineral capacity on the type of enclosing sediments
Dependence of the capacity of manganese minerals on the depth
of micronodule occurrence in sedimentary sequence
Dependence of the capacity of manganese minerals of micronodules
on the bioproductivity of oceanic waters
Comparative analysis of ion exchange properties of ore minerals
in the micronodules. macronodules, and low-temperature hydrothermal
formations
Conclusions
Acknowledgments
References