Next Article in Journal
Comprehensive Utilization of Seawater in China: A Description of the Present Situation, Restrictive Factors and Potential Countermeasures
Next Article in Special Issue
The Stable Isotopic Composition of Different Water Bodies at the Soil–Plant–Atmosphere Continuum (SPAC) of the Western Loess Plateau, China
Previous Article in Journal
Analysis of Dam Inflow Variation Using the Hydrological Sensitivity Method in a Trans-Boundary River Basin: Case Study in the Korean Peninsula
Article

Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake

by 1,2, 1,2 and 1,2,*
1
College of Water Sciences, Beijing Normal University, Beijing 100875, China
2
Engineering Research Center of Groundwater Pollution Control and Remediation Ministry of Education of China, Beijing 100875, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(2), 396; https://doi.org/10.3390/w11020396
Received: 19 December 2018 / Revised: 21 January 2019 / Accepted: 2 February 2019 / Published: 24 February 2019
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 δ56Fe in Hongfeng Lake is between −0.85‰ and +0.14‰, and the value of δ56Fe 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 δ56Fe, 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 δ56Fe; therefore, Fe isotope can be used to trace the lake’s biological action. For the lake and its inflow tributaries, δ56Fe values are higher in summer than in winter. The variation in the δ56Fe 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’s upper and lower water bodies, respectively, has a high correlation with the value of δ56Fe. 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 δ56Fe is low and that of Fe/Al is high in the water bottom, which indicates that a “ferrous-wheel” cycle forms at the bottom of the water. View Full-Text
Keywords: iron isotope; SPM; eutrophic lake; algae iron isotope; SPM; eutrophic lake; algae
Show Figures

Figure 1

MDPI and ACS Style

Zheng, X.; Teng, Y.; Song, L. Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake. Water 2019, 11, 396. https://doi.org/10.3390/w11020396

AMA Style

Zheng X, Teng Y, Song L. Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake. Water. 2019; 11(2):396. https://doi.org/10.3390/w11020396

Chicago/Turabian Style

Zheng, Xiaodi, Yanguo Teng, and Liuting Song. 2019. "Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake" Water 11, no. 2: 396. https://doi.org/10.3390/w11020396

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop