阳澄湖水源中典型嗅味物质测定与来源分析

Determination and Source Analysis of Typical Odor Compounds in Water Source of Yangcheng Lake

以阳澄湖水源为研究对象,采用固相微萃取-气质联用法测定水中2-甲基异莰醇(2-MIB)、土臭素(GSM)、2,4,6-三氯苯甲醚(2,4,6-TAC)、2,3,4-三氯苯甲醚(2,3,4-TAC)、2,3,6-三氯苯甲醚(2,3,6-TAC)、2-异丙基-3甲氧基吡嗪(IPMP)、2-异丁基-3甲氧基吡嗪(IBMP)、β-环柠檬醛、β-紫罗兰酮、异氟尔酮等10种典型嗅味物质,并分析可能的来源藻类。以2018年1月—12月阳澄湖水源中优势藻种为基础,建立以上述嗅味物质为变量的多元线性回归模型。结果表明,水源中2-MIB、GSM、β-环柠檬醛、β-紫罗兰酮、异氟尔酮5种嗅味物质与直链藻、针杆藻、鱼腥藻、色球藻、颤藻、微囊藻、束丝藻7种藻类有较强的相关性。

Taking the source water of Yangcheng Lake as the research object,10 typical odor compounds 2-methylisoborneol(2-MIB),geosmin(GSM),2,4,6-trichloroanisole(2,4,6-TAC),2,3,4-trichloroanisole(2,3,4-TAC),2,3,6-trichloroanisole(2,3,6-TAC),2-isopropyl-3 methoxypyrazine(IPMP),2-isobutyl-3 methoxypyrazine(IBMP),β-cyclocitral,β-ionone,isophorone in water were detected by solid-phase microextraction(SPME)GC-MS.The possible sources of algae were analyzed.Based on the dominant algae species in source water of Yangcheng Lake from January to December 2018,a multiple linear regression model with the above odor compounds as variables was established.Results showed that 2-MIB,GSM,β-cyclocitral,β-ionone and isophorone had strong correlation with Melosira,Synedra,Anabaena,Chroococcus,Oscillatoria,Microcystis,Aphanizomenon in source water.