Sources of arsenic in streams tributary to Lake Crowley, California
Sources of arsenic in streams tributary to Lake Crowley, California
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加利福尼亚州克劳利湖支流中砷的来源
DOI：
10.3133/wri7636
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
L. Eccles
中科院分区：
文献类型：
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作者：
L. Eccles
克劳利湖是洛杉矶最大的单一水源。超过50%的水进入洛杉矶欧文斯河渡槽流经克劳利湖。砷主要从长谷的温泉进入克劳利湖。排入克劳利湖的砷有60%来自热溪峡谷的温泉。每升含有约1，000微克砷的温泉水与溪流中的水混合，通常被稀释至每升约200微克的浓度;下游会进行进一步稀释。热溪中大约75%的砷是从两个泉水中排出的。峡谷中砷的剩余来源是不明确的渗漏和许多小泉水的流动。长谷的其他砷来源是来自高流量和低砷浓度的泉水，如热溪鱼类孵化场的泉水，或高浓度和低流量的泉水，如碱湖附近的泉水。这些其他来源单独与热溪峡谷的来源相比是小的。似乎不太可能。这些来源的砷可能会导致克劳利湖的砷浓度超过环境保护局推荐的公共供水标准（限值）。
Lake Crowley is the largest single source of water for the city of Los Angeles. More than 50 percent of the water entering the Los Angeles-Owens River aqueduct flows through Lake Crowley. Arsenic enters Lake Crowley primarily from hot springs in Long Valley. Sixty percent of the arsenic discharged to Lake Crowley is from hot springs in Hot Creek Gorge. The hot-spring water containing about 1,000 micrograms per litre of arsenic blends with the water flowing in the creek and is usually diluted to a concentration of about 200 micrograms per litre; additional dilution occurs downstream. About 75 percent of the arsenic in Hot Creek is discharged from only two springs. The remaining sources of arsenic in the gorge are poorly defined seepage and flow from numerous small springs. Other sources of arsenic in Long Valley are from either high volume and low-arsenic concentration springs, such as the springs at Hot Creek Fish Hatchery, or high-concentration and low-volume springs, such as those found in the vicinity of the Alkali lakes. These other sources individually are small in comparison with the source in Hot Creek Gorge. It seems unlikely that. arsenic from these sources could cause the arsenic concentration in Lake Crowley to exceed· the Environmental Protection Agency's recommended criterion (limit) for a public water supply.