...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Kinetics and Mechanism of As_2S_3(am) Dissolution under N_2
【24h】

Kinetics and Mechanism of As_2S_3(am) Dissolution under N_2

机译：N_2下As_2S_3（am）溶解的动力学及机理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Arsenic presence in ground and surface waters poses a risk to ecosystem and human health; consequently, detailed information is needed on the factors that govern arsenic fate and transport in the environment. As_2S_3 is commonly found in hydrothermal and geothermal environments, hot springs, and in gold deposits, but the dominant reaction pathways and rates of dissolution are not well understood. The objectives of this research were as follows: (1) to understand the effect of pH on the dissolution of As_2S_3 under nitrogen-purged conditions, (2) to examine arsenic and sulfur speciation upon dissolution, and (3) to develop kinetic data for modeling the dissolution of As_2S_3. Studies were performed in batch reactors for a range of pH from 2 to 8. Results indicate that As_2S_3 dissolution is kinetically slow but very much dependent on pH. A J-shaped dissolution rate versus pH curve is described by the following expression: rate (μM h~(-1)) = 0.9 + 610{OH~-}~(0.3). Rate trends seem to follow As_2S_3 solubility as a function of pH. A surface dissolution mechanism is proposed, leading to dissolved As(Ⅲ) species. Results indicate that under anaerobic conditions, an increase in pH will act to promote the arsenic sulfide dissolution rate.
机译：地下水和地表水中的砷对生态系统和人类健康构成威胁；因此，需要有关控制环境中砷命运和运输因素的详细信息。 As_2S_3通常在热液和地热环境，温泉和金矿中发现，但主要的反应途径和溶出速率尚不清楚。这项研究的目的如下：（1）了解pH对氮气吹扫条件下As_2S_3溶解的影响；（2）检查溶解时的砷和硫形态；以及（3）得出动力学数据模拟As_2S_3的溶解。在分批反应器中对2至8的pH范围进行了研究。结果表明，As_2S_3的溶解动力学缓慢，但很大程度上取决于pH。通过以下表达式描述J形溶解速率对pH的曲线：速率（μMh〜（-1））= 0.9 + 610 {OH〜-}〜（0.3）。速率趋势似乎遵循As_2S_3溶解度随pH的变化。提出了一种表面溶解机制，导致了As（Ⅲ）物质的溶解。结果表明在厌氧条件下，pH的升高将促进硫化砷的溶解速率。

著录项

  • 来源
    《Environmental Science & Technology》 |2004年第4期|p.1031-1037|共7页
  • 作者

    RUXANDRA M. FLOROIU; ALLEN P. DAVIS; ALBA TORRENTS;

  • 作者单位

    Department of Civil and Environmental Engineering and Maryland Water Resources Research Center, University of Maryland, College Park, Maryland 20742;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号