Aluminium in Lake Cuicocha,Ecuador, an Andean Crater Lake: Filterable,Gelatinous and Microcrystal Al Occurrence |
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| Authors: | G Gunkel C Beulker B Grupe U Gernet F Viteri |
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| Institution: | 1.Department of Water Quality Control,Berlin University of Technology,Berlin,Germany;2.Department of Water, Environment and Marine Science and Technology (VWS),Berlin University of Technology,Berlin,Germany;3.Department of Electron Microscopy,Berlin University of Technology,Berlin,Germany;4.Facultad de Ingeniera en Geología, Minas, Petróleos y Ambiental, Quito (FIGEMPA),Universidad Central,Quito,Ecuador |
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| Abstract: | In Lake Cuicocha watershed, a young caldera lake, soils consist of volcanic deposits with a high SiO2 and Al2O3 content; these andisols are in an early stage of development; and in drainage water from the watershed, aluminium concentrations
reach 15.0 μmol L−1. Total aluminium concentrations in Lake Cuicocha water raises up to 7.2 μmol L−1, with nearly 70% occurring as filterable Al at neutral to weak alkaline conditions. Al polymerization to gelatinous aggregates
of a few hundred micrometres in diameter as well as the occurrence of Al microcrystals like gibbsite as an ageing product
of gelatinous Al polymers was noted in the lake water. The gelatinous Al leads to the formation of larger aggregates resulting
in flocs of bacteria, algae, microorganisms and detritus. |
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