【摘要】 于2013年每月测定了苏州太湖饮用水源地9种异味物质含量及TP、TN、水温、藻密度等指标,结果表明,苏州太湖饮用水源地主要检出的异味物质有2-甲基异崁醇、土臭素、β-环柠檬醛和β-紫罗兰酮等4种。2-甲基异崁醇年均值是其嗅觉阈值的2.9倍,水体主要表现为土霉味。根据异味物质与环境因子相关性分析结果及相关文献讨论,水温是影响异味物质含量的重要因素。微囊藻等藻类对β-环柠檬醛和β-紫罗兰酮有明显贡献。更多还原

【Abstract】 Nine off-flavor compounds,and several environmental factors such as TP,TN,water temperature,and algal density et al.in drinking water sources of Taihu in Suzhou were measured monthly in 2013. The main off-flavor compounds were 2- methylisoborneol( 2- MIB),geosmin,β-cyclocitral,and β-ionone. Annual average concentration of 2-MIB was 2. 9 times of its odor threshold value,which caused earthy odor of the water. According to correlation analysis between off-flavor compounds and environmental factors,and together with discussion from related literature,water temperature was one of the main factors affecting concentration of off-flavor compounds. Microcystis contributed obviously to the occurrence of β-cyclocitral and β-ionone.更多还原