Elemental and Trace Metal Composition of Nano-phytoplankton in Natural Assemblage
Date Issued
2014
Date
2014
Author(s)
Du, Jia-Wei
Abstract
In natural water, phytoplankton plays an extremely important role in biogeochemical cycle of elements. In this study, nanoplankton populations and elemental composition were investigated. The planktons were first isolated and concentrated with the used of ultra-clean cross-flow filtration technique, and then, cell numbers were counted by Coulter Counter, phytoplankton photopigments were analyzed by High Pressure Liquid Chromatography, carbon and nitrogen were measured by Elemental Analyzer, trace metals were measured by Graphite Furnace-Atomic Absorption Spectrometry. The results showed that the phytoplankton populations (green algae, blue-green algae, diatoms, golden algae) and elemental composition are significantly different among each month, and between freshwater and marine environments. On the average, the concentrations of C, N, S, and P in collected nanoplankton were 20.56 ± 8.78 %, 4.11 ± 1.82 %, 1.06 ± 0.75 %, and, 4.32 ± 3.39 % respectively. Trace metal (Fe, Zn, Cu, Cd, Ni) contents, and the elemental (C, N, S, P) to trace metal mole ratio were found different then previous studies. On average, a mole stoichiometry ratio of (C105.6N16.6P1S0.8)1000Fe141Zn3.2Cu0.20Ni0.31Cd0.006 is found for freshwater nanoplankton, and (C90.9N16.7P1S1.6)1000Fe27Zn2.0Cu0.19Ni0.16Cd0.001 for marine nanoplankton. In addition, strong correlations were found between Fe and Cu, and that of Ni and Cd, due to corresponding roles in photosynthese and metabolic reactions. It is concluded that molar absorption ratio and reaction rate obtained from lab-cultured experiments and domesticated nanophytoplankton are significant different than the ones collected from natural environment.
Subjects
微型浮游植物
超微過濾
基本元素
微量金屬
SDGs
Type
thesis
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