Chen Qing-feng, Shan Bao-qing, Ma Jun-jian, Gao Xin-guo, Ding Shi-gang, Liu Wei, Zhang Jing
Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Provincial Analysis Test Center, Ji'nan 250014, China.
Huan Jing Ke Xue. 2011 May;32(5):1340-5.
To study the purification mechanism and biogeochemical cycle of wetlands, the concentration of Fe/Mn and oxidation reduction potential (ORP) in the pore water were monitored in situ on the Wuhan Zoo stormwater wetland from 2004 to 2006. The results showed that the water level of the wetland was changed from -10 cm to 30 cm, and the range of ORP was-120-220 mV. The elements of sulfur, iron and manganese were the main oxidation and reduction systems in the wetland. The ranges of total Fe, Mn and Fe2+ concentration were 0.60-2.35, 0.75-1.89 and 0.20-1.25 mg x L(-1), respectively. The concentrations of total Fe, Mn and Fe2+ were higher in spring and summer than that in autumn and winter, while the sulfate concentration was on the contrary and the ratio of Fe2+/Fe was slightly various in different seasons. From the surface of 10 cm to 50 cm underground, ORP and pH was decreased, whereas the concentrations of total Fe, Mn and Fe2+ were increased (except for the surface water). Through the correlation analysis, it was showed that the correlation of ORP and total Mn and Fe2+ was negative and significant, while there was no significant correlation between ORP and total Fe (R = -0.169, p < 0.0001). The order of the correlation coefficient was total Mn, Fe and Fe2+ in turn. Therefore, the systems of sulfur, iron and manganese were the important component of the oxidation and reduction system for stormwater wetland.
为研究湿地的净化机制和生物地球化学循环，于2004年至2006年对武汉动物园雨水湿地孔隙水中的铁/锰浓度和氧化还原电位（ORP）进行了原位监测。结果表明，湿地水位从-10厘米变化到30厘米，ORP范围为-120至220毫伏。硫、铁和锰元素是湿地中的主要氧化还原体系。总铁、锰和Fe2+浓度范围分别为0.60 - 2.35、0.75 - 1.89和0.20 - 1.25毫克·升-1。总铁、锰和Fe2+浓度在春季和夏季高于秋季和冬季，而硫酸盐浓度则相反，且不同季节Fe2+/Fe比值略有不同。从地下10厘米到50厘米深处，ORP和pH值降低，而总铁、锰和Fe2+浓度升高（地表水除外）。通过相关性分析表明，ORP与总锰和Fe2+的相关性为负且显著，而ORP与总铁之间无显著相关性（R = -0.169，p < 0.0001）。相关系数顺序依次为总锰、铁和Fe2+。因此，硫、铁和锰体系是雨水湿地氧化还原系统的重要组成部分。
