摘要
东太湖是太湖流域重要的水源地,苏州市吴江区取水口位于其中,水体中出现异嗅味。为了解东太湖水体中嗅味物质的空间分布及甄别围网养殖可能对其的影响,在东太湖的不同区域设置监测点位,利用GC-MS对水体中的嗅味物质进行监测。结果表明:1)水体中嗅味物质2-甲基异莰醇(MIB)和土嗅素(Geosmin)的浓度分布具有显著的空间异质性,其浓度随距养殖区域距离的增加而递减;2)水体中嗅味物质2-MIB和Geosmin的浓度与温度显著正相关,当温度为最高时,其最大浓度分别达到1121.99 ng/L和34.29 ng/L;3)水温和硝酸盐氮浓度对2-MIB浓度有极显著影响(P <0.01),水温越高,硝酸盐氮浓度越高,2-MIB浓度越高,总磷浓度和硝酸盐氮浓度对土嗅素浓度有显著影响(P <0.05)。网围养殖可能是水体中嗅味物质的一个重要来源,在东太湖及其它水源地治理中应引起高度重视。
East Taihu Lake is an important water source in Taihu Lake basin. The water intake of Wujiang District in Suzhou City is in East Taihu Lake, and there is a peculiar smell in the water body. In order to understand the spatial distribution of taste and odor substances in East Taihu Lake and identify the possible effects of enclosure culture, monitoring sites were set up in different areas, and GC-MS was used to monitor the taste and odor substances in the water. The results showed that： 1） the concentration distribution of 2-methylisocamptol （MIB） and Geosmin had significant spatial heterogeneity, and their concentrations decreased with the increase of the distance from the culture area; 2） the concentration of 2-MIB and Geosmin in the water was positively correlated with the temperature, and the concentration was the highest. The concentrations of 2-MIB and Geosmin would respectively reach 1121.99 ng/L and 34.29 ng/L when the temperature was the highest. 3） The water temperature and nitrate nitrogen concentration had significant effects on the concentration of 2-MIB （P 〈 0.01）. The higher the water temperature was, the higher the concentration of nitrate nitrogen, and the higher the concentration of 2-MIB. The concentrations of total phosphorus and nitrate nitrogen had significant effects on the Geosmin concentration （P 〈 0.05）. Enclosure culture might be an important source of taste and odor substances in water, and great attention should be paid to the treatment of East Taihu Lake and other water sources.
作者
展永兴
吴心艺
ZHAN Yongxing;WU Xinyi(Jiangsu Taihu Planning and Design Institute of Water Resources Co.,Ltd,Suzhou 215128,Jiangsu)
出处
《江苏水利》
2018年第9期1-5,共5页
Jiangsu Water Resources
关键词
东太湖
围网养殖
2-MIB
嗅味物质
East Taihu Lake
enclosure culture
2-MIB
taste and odor substances
