| 摘要: |
| 酸可挥发性硫化物(AVS)是评价沉积物中重金属生物毒性的一个重要参数，但AVS 易随氧化还原环境变化，所以对分析测试要求较高。以往AVS 的测定方法较为费时费力，无法用于常规监测，或不适用于测定AVS 含量偏低的沉积物样品。本研究在现有分析方法的基础上进行了改进，建立了一个扩散法和亚甲基蓝比色法联用的分析方法，使其适用于测定AVS 含量偏低的海洋和湖泊沉积物样品。通过对回收率、空白、重复性的实验显示，该方法能够快速、准确的进行大批量样品的测试。应用该方法对渤海湾和莱州湾上百个沉积物样品的分析发现，AVS 含量低于0.6μmol/g (DW)的样品量达到75%。因我国近岸海域有机碳含量偏低，AVS 的含量也可能偏低，所以该方法对我国近岸海洋沉积物中AVS 的分析测试有普适性。该分析方法的建立为我国应用AVS 对沉积物中重金属生物毒性的研究提供了便利。 |
| 关键词: 重金属 沉积物 酸可挥发性硫化物(AVS) 分析方法 |
| DOI：10.11693/hyhz20140400111 |
| 分类号: |
| 基金项目:国家海洋局第一海洋研究所基本科研业务专项资金项目, 2011T09号; 海洋公益性行业专项经费资助项目, 201105003号。 |
附件 |
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| ANALYTICAL METHOD OF ACID VOLATLE SULFIDE IN SEDIMENT |
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LI Li, WANG Xiao-Jing, LIU Ji-Hua
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The First Institute of Oceanography, Qingdao 266061, China
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| Abstract: |
| Acid volatile sulfide (AVS) is a key parameter in assessing metal toxicity in sediment. AVS is easy to be affected by the redox environment. Therefore, the requirement on the analysis is very strict. In the past, the AVS analysis is laborious, and cannot be applied for regular monitoring work or for analyzing sediments with relatively low AVS content. Based on current available methods, we established a new analytical method by combining diffusion method with colorimetric method, which is suitable for marine or lake sediments with relatively low AVS contents. The recovery, blank, and replication of this analytical method have been assessed and the results showed that the method can provide quick and accurate measurements for a large batch of samples. Having analyzed over a hundred samples in Bohai and Laizhou Bays using this method, we found that about 75% samples had AVS concentration lower than 0.6 μmol/g (DW). The total organic carbon content in the sediments of Chinese coast is relatively low, and the AVS contents may also be low. Therefore, this method may be applicable for assessing metal toxicity in coastal sediments in China. The establishment of this analytical method offers an easy way for assessing sediment toxicity in the sediments. |
| Key words: heavy metals sediments acid volatile sulfide analytical method |
