中文摘要：

为了探究西北某水厂致嗅物质的来源及其变化规律，解决其饮用水嗅味问题．选取我国西北某城市A水厂第二系列各工艺出水，以土臭素（Geosmin，GSM）和二甲基异莰醇（MIB）两种致嗅物质为研究对象，运用顶空-固相微萃取-气相色谱法（HS-SPME—GC）进行检测．结果表明：一年中A水厂原水GSM和MIB在4—5月和11-12月两个时段浓度均明显升高，最高浓度达到其嗅阈值的40～50倍．其他时段GSM均处于10ng／L以下，MIB则在10～50ng／L之间．通过比较两种嗅味物质浓度变化得出：MIB为A水厂水源的主要致嗅物质；原水的水温和浊度对两种嗅味物质浓度变化影响具有协同作用；水厂净水工艺对GSM和MIB无明显的去除效果．利用BG11液体培养基对原水中的藻类进行培养后，发现优势藻种为浮丝藻，属于蓝藻门；GSM、MIB浓度从最初的10ng／L以下分别升高到28ng／L和1317ng／L．

英文摘要：

In order to explore the sources and variations of odor substances in a water plant of Northwest China, and to solve the odor problem of drinking water, a water plant in a city of Northwest China was selected as monitor object, using the method of headspace-solid phase microextraction-gas chromatography to do the detection. As a result, the concentration of GSM and MIB in raw water of the water plant significantly increased between in the April and May and also between November and December in a same year. The highest Concentrations of both materials are 40 - 50 times when they are mentioned to each corresponding threshold odor number. At other stages, the concentration of GSM is under 10 ng/L, while MIB is in 10-50 ng/L. Through comparison of these two odor materials, MIB becomes the main odor substance in raw water of the water plant. The water temperature and turbidity have a synergistic effect to the concentration of GSM and MIB. The traditional water treatment process is no use for T ＆ O compounds removal. At the same time, BGll liquid medium was used to cultivate algae in the raw water in June 25, and analysis on the change of algae and the concentrations of GSM and MIB were carried out. Results showed that dominant algae becomes phormidium tenue, an algae that belongs to cyanobacteria. The concentration of GSM and MIB increases from under 10 ng/L rise to 28 ng/L and I 317 ng/L respectively.