Evaluation and Prediction of Linear Alkylbenzenesulf onates (LAS) in Water and Sediment
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概要
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A field survey was performed to observe the concentration of linear alkylbenzenesulfonates (LAS) in Japanese 28 highly polluted lakes. Specifically in Lake Teganuma, frequent obsrvations of LAS in water and sediment were obtained, and the tendency of temporal and spatial variation in LAS concentration and the relationship between concentration in water and sediment were investigated . Though LAS con centration in water varied seasonally between <0.001 and 1 mgl<SUP>-1</SUP>, the temporal variation in sediment was much smaller than in water. It was below 1 order magnitude. Therefore, LAS concentration in sediment (average at 0-8 cm depth) was expected to describe adequately the average yearly LAS contamination at each point . LAS in water and sediment indicated a downstream decrease between lake estuary and the center of lake. This decrease could be assessed by a function of the residence time, which was the first order reaction model (dC/dT =-kc). LAS in lake estuarine water (an intermediate between watershed and lake) was estimated in two methods at every studied lake. The first estimation was performed from inflow loading which was calculated by the specific unit, and the second was from LAS concentration in lake sediment and the downstream decrease rate. An adequate agreement between the two types of estimated results was obtained, so that the LAS concentration in lake sediment could be determined due to the inflow loading from the watershed and the downstream decrease rate in the lake. By using these information, some effective methods for evaluating and predicting LAS in water and sediment were presented.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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