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Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake

By Xiaodi Zheng, Yanguo Teng and Liuting Song

Abstract

The geochemical study of iron isotopes is of great significance to comprehensively understand the surface material circulation process and its environmental effects in surface and subsurface environments. Eutrophic lakes are an important part of the surface and subsurface environment; however, knowledge of the geochemical behaviour and fractionation mechanism of iron isotopes in the biogeochemical cycling of eutrophic lakes is still scarce. In this study, a eutrophic lake with seasonal anaerobic characteristics (Hongfeng Lake) was selected as the study object to systematically analyse the iron isotope composition of suspended particles in lake water and the main tributaries in different seasons. The results show that the value of &#948;<sup>56</sup>Fe in Hongfeng Lake is between &#8722;0.85&#8240; and +0.14&#8240;, and the value of &#948;<sup>56</sup>Fe has a high linear correlation with Fe/Al, indicating that the continental source material carried by the main inflow tributaries of the lake has an important influence on the source of iron in the lake. And Hongfeng Lake is moderately eutrophic lakes. Algal bloom and the content of chlorophyll a (Chl-a) are high, combined with the high correlation between Chl-a and the value of &#948;<sup>56</sup>Fe, which indicates that the growth of algae has an important influence on the change in the iron isotope composition of suspended particulate matter (SPM) in lake water and that the adsorption and growth absorption of Fe by algae are the main reason for the change in the value of &#948;<sup>56</sup>Fe; therefore, Fe isotope can be used to trace the lake&#8217;s biological action. For the lake and its inflow tributaries, &#948;<sup>56</sup>Fe values are higher in summer than in winter. The variation in the &#948;<sup>56</sup>Fe value of SPM with lake depth is more distinct in summer than in winter. In addition, there is a distinct thermocline in summer, which leads to hydrochemical stratification. Moreover, according to a linear correlation analysis, the content of dissolved organic matter (DOC) in Hongfeng Lake&#8217;s upper and lower water bodies, respectively, has a high correlation with the value of &#948;<sup>56</sup>Fe. Specifically, the correlation is positive in the upper water but negative in the lower water, which indicates that the difference in algae metabolism patterns between the upper and lower water bodies of Hongfeng Lake plays an important role in the iron isotope composition of SPM. The composition of the iron isotope in SPM is altered by organic adsorption and growth absorption of algae in the upper water. With an increase in depth, degradation becomes the main process. In addition, the value of &#948;<sup>56</sup>Fe is low and that of Fe/Al is high in the water bottom, which indicates that a &#8220;ferrous-wheel&#8222; cycle forms at the bottom of the water

Topics: iron isotope, SPM, eutrophic lake, algae, Hydraulic engineering, TC1-978, Water supply for domestic and industrial purposes, TD201-500
Publisher: MDPI AG
Year: 2019
DOI identifier: 10.3390/w11020396
OAI identifier: oai:doaj.org/article:45e3d02d769442379736ac82a80ef75b
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