对导致西班牙西北部供水中几种气味问题的有机化合物进行了研究 进行。酸抹布、土豆桶和发霉是与这些事件相关的主要描述词。 闭环溶出分析（CLSA）被用作与感官分析相结合的预浓缩方法- GC和GC/MS检测。导致第一次气味事件的化合物被确定为2-甲氧基- 3,5-二甲基吡嗪。一个工厂的进水和出水浓度分别为2010和300纳克/升 活性污泥污水处理厂的出水浓度为3纳克/升。虽然2-甲氧基-3,5-二甲基吡嗪 之前被报道为葡萄酒软木塞和旧机器切削液乳剂中的恶臭化合物， 这是它首次被确定为导致成品水中异味事件的化合物。在几个月后发生的另一次事件中，2-异丁基-3-甲氧基吡嗪和其他烷基甲氧基吡嗪是导致气味的化合物。在污水处理厂的活性污泥中测量了mg/L范围内的浓度水平。包括9个参考文献、表格、图表。

A study of organic compounds causing several odor problems in water supplies from NW Spain was conducted. Sour dish-cloths, potato bins, and musty were the main descriptors associated with these events. Closed loop stripping analysis (CLSA) was used as a preconcentration method combined with sensory- GC and GC/MS detection. The compound responsible of the first odor events was identified as 2-methoxy- 3,5-dimethylpyrazine. Concentration levels were 2010 and 300 ng/L in the influent and effluent from an activated sludge WWTP to 3 ng/L in finished water. Although 2-methoxy-3,5-dimethylpyrazine has been previously reported as the malodorous compound in wine corks and old machine cutting-fluid emulsions, this is the first time it was identified as the compound responsible for odor incidents in finished water. 2-isobutyl-3-methoxypyrazine and other alkyl methoxypyrazines were the compounds responsible for the odor in another event that occurred several months later. Concentration levels in the mg/L range were measured in the activated sludge of the WWTP. Includes 9 references, table, figures.