GEOSMIN AND 2-METHYLISOBORNEOL PRODUCTION IN A MAJOR AQUEDUCT SYSTEM
GEOSMIN AND 2-METHYLISOBORNEOL PRODUCTION IN A MAJOR AQUEDUCT SYSTEM
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DOI：
10.1016/0273-1223(95)00454-u
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发表时间：
1995-01-01
影响因子：
2.7
通讯作者：
TAYLOR, WD
中科院分区：
文献类型：
--
作者：
IZAGUIRRE, G;TAYLOR, WD
加州渡槽从北加州向南加州供水，在金字塔湖上方分为西支和东支。 1990 年 7 月和 8 月，沿着莫哈韦沙漠南缘延伸的渡槽东支出现土臭素水平升高（10-48 纳克/升）。土臭素事件与渡槽两侧附着的藻类生长有关。从水和附生生物中分离出一种产生土臭素的蓝藻，可能是微鞘藻属。 1991 年夏季，渡槽东支中 2-甲基异龙脑 (MIB) 含量升高（高达 78 纳克/升），而土臭素含量较低。 1992年7月，MIB再次生产，导致一家直接从渡槽取水的水务机构出现严重异味问题，引起消费者大量投诉。在这两集中，Lyngbya sp。与附生生物和水边附近收集的泥土隔离。这些分离株在培养中是很强的 MIB 生产者，产量分别为 240 和 260 微克/升。从 1992 年开始，从接种渡槽水的膜过滤板中分离出第二种相对较弱的 MIB 生产者 Hyella sp.。这些异味事件（与干旱期间的低流量有关）表明，当条件发生变化时，以前未受污染的水源可能会受到这些问题的影响。
The California Aqueduct supplies water from Northern California to Southern California, dividing into the West and East branches above Pyramid Lake. In July and August 1990, elevated geosmin levels (10-48 ng/l) occurred in the East Branch of the aqueduct, which extends along the southern edge of the Mojave Desert. The geosmin episode was associated with attached algal growths on the sides of the aqueduct. A geosmin-producing cyanobacterium, possibly a Microcoleus sp., was isolated from both water and periphyton. In the summer of 1991, elevated levels of 2-methylisoborneol (MIB) occurred in the East Branch of the aqueduct (up to 78 ng/l), along with lower levels of geosmin. In July 1992, a recurrence of MIB production led to a severe off-flavor problem for a water agency that receives water directly from the aqueduct, resulting in numerous complaints from consumers. In both episodes, a Lyngbya sp. was isolated from periphyton and mud collected near the water's edge. These isolates were strong MIB producers in culture, yielding 240 and 260 mu g/l, respectively. Beginning in 1992, a second, relatively weak MIB producer, a Hyella sp., was isolated from membrane-filter plates inoculated with aqueduct water. These off-flavor episodes - associated with low flows during a drought period - showed that previously untainted water sources can be affected by these problems when conditions change.