| Acid Volatile Sulfide and Simultaneously Extracted Metals in Tidal Flat Sediments of Jiaozhou Bay, China |
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| 作者姓名： | ZHANG Xiangshang ZHANG Longjun |
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| 作者单位： | Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education,Ocean University of China, Qingdao 266100, P. R. China |
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| 摘 要： | It is well known that acid-volatile sulfide （AVS） plays an important role in influencing the toxicity of divalent cationic metals within anoxic sediments. In studying sediment core samples collected from tidal flats within the Jiaozhou Bay, China, we found that the AVS concentration gradually increases with depth and decreases from high tidal flat to low tidal flat areas. We evaluated the chemical activity and bioavailability of heavy metals in the tidal flat based on the molar ratio of simultaneously extracted metals （SEM） and AVS. The value of SEM/AVS is generally less than 1 in this area except for the surface layer, which suggests that the heavy metals only have chemical activity in the surface layer. SEM is most highly concentrated at the boundary of the redox layer SEM have similar depth distributions throughout the tidal flat. The aeration of low tidal flat sediment indicates that SEM gradually move to deeper sites via interstitial water.
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| 关 键 词： | 中国 胶洲湾 潮坪沉积物 酸性挥发性硫化物 重金属 |
| 收稿时间： | 2005-02-13 |
| 修稿时间： | 2006-11-29 |
Acid volatile sulfide and simultaneously extracted metals in tidal flat sediments of Jiaozhou Bay,China |
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| ZHANG Xiangshang ZHANG Longjun.Acid Volatile Sulfide and Simultaneously Extracted Metals in Tidal Flat Sediments of Jiaozhou Bay, China[J].Journal of Ocean University of China,2007,6(2):137-142. |
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| Authors: | Zhang Xiangshang Zhang Longjun |
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| Institution: | Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education,Ocean University of China, Qingdao 266100, P. R. China |
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| Abstract: | It is well known that acid-volatile sulfide (AVS) plays an important role in influencing the toxicity of divalent cationic metals within anoxic sediments. In studying sediment core samples collected from tidal flats within the Jiaozhou Bay, China, we found that the AVS concentration gradually increases with depth and decreases from high tidal flat to low tidal flat areas. We evaluated the chemical activity and bioavailability of heavy metals in the tidal flat based on the molar ratio of simultaneously ex- tracted metals (SEM) and AVS. The value of SEM/AVS is generally less than 1 in this area except for the surface layer, which suggests that the heavy metals only have chemical activity in the surface layer. SEM is most highly concentrated at the boundary of the redox layer. SEM have similar depth distributions throughout the tidal flat. The aeration of low tidal flat sediment indicates that SEM gradually move to deeper sites via interstitial water. |
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| Keywords: | Jiaozhou Bay tidal flat acid volatile sulfide heavy metal |
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