Redox Dynamic Effect on Fluoride and Arsenic Released from Sediments in the Baiyangdian Plain, Hebei

doi:10.19657/j.geoscience.1000-8527.2022.006

Abstract

Abstract:

Precipitation, discharge and draining caused by seasonal fluctuations would generate redox oscillations in shallow groundwater system, which may shed light on the reactive transport of groundwater components in aquifers. To explore the influence of redox oscillations on the release of arsenic and fluoride in sediments, a sediment sample from the Baiyangdian Plain was collected for this study. Variations in aerobic/anaerobic conditions were controlled automatically. During the redox oscillations, solution composition changes in each experimental system were monitored. Results suggest that the groundwater As-F enrichment was promoted by the alkaline and reducing conditions. The reason may be that the pH is higher under reducing conditions, which is conducive to F^- enrichment. In addition, DOM degradation produced large amount of HC0₃^- and C0₃^2- in solution, which benefits groundwater F^- enrichment via competition. Since As (III) adsorption onto sediments is weaker than that of As (V), the dominant As (III) species in reducing solution would promote As mobility. Furthermore, the higher pH reduces the As adsorption capacity onto sediments, which causes As desorption. We found that the varying S0₄^2- concentrations show no clear effect on the As-F enrichment in the dynamically redox experiments. To conclude, the dynamic redox changes would strongly affect the enrichment of As and F^- in groundwater.

Key words: Baiyangdian Plain, redox oscillation, arsenic, fluoride

CLC Number:

P641.3
X523

CAO Yuanyuan, GUO Huaming, GAO Zhipeng. Redox Dynamic Effect on Fluoride and Arsenic Released from Sediments in the Baiyangdian Plain, Hebei[J]. Geoscience, 2022, 36(02): 533-542.

Figures/Tables 12

Fig.1 Location of the study area

Table 1 Background values of different elements in sediment sample BDZK1-222 (mg/kg)

元素	K	Fe	Ca	Ti	Ba	Mn	Sr	Zr	Rb	V	Zn	Cr	Co	Ta	Ni	Pb	Cu	Th	As
含量	21 749	12 496	4 633	1 199	440	245	229	112	67.3	64.9	25.1	18.8	15	15	14	12.5	5	4	3

Fig.2 Photo (a) and schematic illustration (b) of the experimental setup

Fig.3 Temporal variations of ORP and pH in three experimental systems (grey and white shades denoting anoxic and oxic half-cycles, respectively; arrows showing the timing of sodium lactate addition)

Fig.4 Temporal variations of DOC concentrations in three experimental systems

Fig.5 Temporal variations of F- concentrations in three experimental systems

Table 2 Comparison of solution S O 4 2 - and F-concentrations in three experimental systems

反应器	R₁	R₂	R₃
S $O 4 2 -$ 浓度/mM	0.1	1	5
F^-质量浓度(最大值)/(mg/L)	14.50	8.98	6.66

Table 2 Comparison of solution S O 4 2 - and F-concentrations in three experimental systems

反应器	R₁	R₂	R₃
S $O 4 2 -$ 浓度/mM	0.1	1	5
F^-质量浓度(最大值)/(mg/L)	14.50	8.98	6.66

Fig.6 Box plots of pH and F- concentrations in three experimental systems in oxic and anoxic stages

Fig.7 Correlation plots for F- vs. DOC concentrations in three experimental systems

Fig.8 Temporal variations of As (total) concentrations in three experimental systems

Fig.9 Correlation plots of pH vs. As concentrations in three experimental systems

Fig.10 Correlation plots of As vs. consumed DOC concentrations in three experimental systems

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