Determination of Sediment Oxygen Demand in the Ziya River Watershed, China: Based on Laboratory Core Incubation and Microelectrode Measurements

Nan Rong, Baoqing Shan and Chao Wang
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Nan Rong: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China
Baoqing Shan: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China
Chao Wang: Changjiang Water Resource Protection Institution, Wuhan 430051, China

IJERPH, 2016, vol. 13, issue 2, 1-15

Abstract: A study coupling sedimentcore incubation and microelectrode measurement was performed to explore the sediment oxygen demand (SOD) at 16 stations in the Ziya River Watershed, a severely polluted and anoxic river system in the north of China. Total oxygen flux values in the range 0.19–1.41 g/(m 2 ·d) with an average of 0.62 g/(m 2 ·d) were obtained by core incubations, and diffusive oxygen flux values in the range 0.15–1.38 g/(m 2 ·d) with an average of 0.51 g/(m 2 ·d) were determined by microelectrodes. Total oxygen flux obviously correlated with diffusive oxygen flux ( R 2 = 0.842). The microelectrode method produced smaller results than the incubation method in 15 of 16 sites, and the diffusive oxygen flux was smaller than the total oxygen flux. Although the two sets of SOD values had significant difference accepted by the two methods via the Wilcoxon signed-rank test ( p < 0.05), the microelectrode method was shown to produce results that were similar to those from the core incubation method. The microelectrode method, therefore, could be used as an alternative method for traditional core incubation method, or as a method to verify SOD rates measured by other methods. We consider that high potential sediment oxygen demand would occur in the Ziya River Watershed when the dissolved oxygen (DO) recovered in the overlying water.

Keywords: sediment oxygen demand; microelectrode; microprofile; oxygen flux; the Ziya River Watershed (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2016
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