| 长江口水环境中纳米颗粒物初探 |
| 摘要点击 2792 全文点击 1963 投稿时间：2010-07-14 修订日期：2010-09-02 |
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| 中文关键词 长江口 NP 切向超滤 痕量金属 环境因子 |
| 英文关键词 Yangtze estuary nanoparticles cross-flow ultrafiltration(CFUF) trace metals environmental factors |
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| 中文摘要 |
| 利用抽滤及切向超滤（cross-flow ultrafiltration, CFUF）技术对长江口水环境中的纳米级颗粒物（NP）进行了有效地分离，对其理化性质进行表征，进而初步探讨了水环境因子对NP理化特性的影响机制.结果表明，长江口水环境中NP粒径变化范围为69.5～263.5 nm，平均值为157.3 nm；Zeta-电位为-40.1～196.0 mV；NOC的浓度在0.3～1.5mg/L之间，平均为0.7mg/L，NOC在DOC中的质量分数为5.1%～30.5%，平均为16.7%；金属元素与NP结合能力的大小依次为锌>铜>总铬>钴>镍>锰>铁>锂>铝>硼>钾>钡>锶>镁>钙>钠.显示了陆源物质输入可能为长江口水体中NOC的主要来源；NP与痕量金属结合的能力大于常规金属元素.相关分析表明NP粒径与盐度、DOC、NOC、SPM及Zeta-电位均无显著相关性，相对于NOC和UOC，DOC及盐度对NP形态痕量金属含量有较大的影响. |
| 英文摘要 |
| Filtration and cross-flow ultrafiltration(CFUF) was applied for the effective separation of NPs in the Yangtze Estuary. The physiochemical properties of NP were characterized, and their relationships with environmental factors were further studied in the present study. The results show that NP size in Yangtze Estuary ranged from 69.5 to 263.5 nm with the average value of 157.3 nm and Zeta-potential values ranged from -40.1 mV to 196.0 mV. NOC concentrations ranged from 0.3 mg/L to 1.5 mg/L and the average value was 0.7 mg/L. NOC account for 5.1% to 30.5% of DOC, with an average of 16.7%. The binding capacity of metals with NP in the Yangtze River Estuary was in the order of Zn>Cu> total Cr>Co>Ni>Mn>Fe>Li>Al>B>K>Ba>Sr>Mg>Ca>Na, which reveals that terrigenous input may be the main source of NOC in the Yangtze River. The binding capacity of NP with trace metal is generally higher than the conventional metallic element. There was no significant correlation between NP size and salinity, DOC, NOC, SPM and Zeta-potential, respectively. Compared to NOC and UOC, better correlation was investigated between DOC, salinity and NP bound trace metals. |
