...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Occurrence and behavior of butyltins in intertidal and shallow subtidal surface sediments of an estuarine beach under different sampling conditions
【24h】

Occurrence and behavior of butyltins in intertidal and shallow subtidal surface sediments of an estuarine beach under different sampling conditions

机译：不同采样条件下河口滩潮间带和浅潮带表层沉积物中丁基锡的发生与行为

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

Contamination by butyltin compounds (BTs) has been reported in estuarine environments worldwide, with serious impacts on the biota of these areas. Considering that BTs can be degraded by varying environmental conditions such as incident light and salinity, the short-term variations in such factors may lead to inaccurate estimates of BTs concentrations in nature. Therefore, the present study aimed to evaluate the possibility that measurements of BTs in estuarine sediments are influenced by different sampling conditions, including period of the day (day or night), tidal zone (intertidal or subtidal), and tides (high or low). The study area is located on the Brazilian southeastern coast, Sao Vicente Estuary, at Pescadores Beach, where BT contamination was previously detected. Three replicate samples of surface sediment were collected randomly in each combination of period of the day, tidal zone, and tide condition, from three subareas along the beach, totaling 72 samples. BTs were analyzed by GC-PFPD using a tin filter and a VF-5 column, by means of a validated method. The concentrations of tributyltin (TBT), dibutyltin (DBT), and monobutyltin (MBT) ranged from undetectable to 161 ng Sn g~(-1) (d.w.). In most samples (71%), only MBT was quantifiable, whereas TBTs were measured in only 14, suggesting either an old contamination or rapid degradation processes. DBT was found in 27 samples, but could be quantified in only one. MBT concentrations did not differ significantly with time of day, zones, or tide conditions. DBT and TBT could not be compared under all these environmental conditions, because only a few samples were above the quantification limit. Pooled samples of TBT did not reveal any difference between day and night. These results indicated that, in assessing contamination by butyltin compounds, surface-sediment samples can be collected in any environmental conditions. However, the wide variation of BTs concentrations in the study area, i.e., over a very small geographic scale, illustrates the need for representative hierarchical and composite sampling designs that are compatible with the multiscalar temporal and spatial variability common to most marine systems. The use of such sampling designs will be necessary for future attempts to quantitatively evaluate and monitor the occurrence and impact of these compounds in nature.
机译：在世界范围的河口环境中，已经报道了丁基锡化合物（BTs）的污染，这严重影响了这些地区的生物群。考虑到BTs会因环境条件（例如入射光和盐度）的变化而降解，因此这些因素的短期变化可能导致自然界中BTs浓度的估算不准确。因此，本研究旨在评估河口沉积物中BTs的测量是否受到不同采样条件的影响，这些采样条件包括白天（白天或黑夜），潮汐带（潮间带或潮下带）和潮汐（高或低）。 。研究区域位于巴西东南海岸的Pescadores海滩的Sao Vicente河口，以前曾检测到BT污染。在白天，潮汐带和潮汐条件的每种组合中，从海滩沿岸的三个分区中随机收集了三个重复的地表沉积物样本，总共有72个样本。使用锡过滤器和VF-5色谱柱通过GC-PFPD通过验证的方法对BTs进行分析。三丁基锡（TBT），二丁基锡（DBT）和单丁基锡（MBT）的浓度范围为无法检测到161 ng Sn g〜（-1）（d.w.）。在大多数样品（71％）中，只有MBT是可定量的，而仅14种样品中的TBT含量可测，这表明是旧污染或快速降解过程。在27个样本中发现了DBT，但仅可以量化一次。 MBT浓度随一天中的时间，区域或潮汐条件而无显着差异。在所有这些环境条件下都无法比较DBT和TBT，因为只有少数样品超过了定量限。 TBT的合并样本没有显示白天和黑夜之间的任何差异。这些结果表明，在评估丁基锡化合物的污染时，可以在任何环境条件下收集表面沉积物样品。然而，研究区域中BTs浓度的广泛变化，即在很小的地理范围内，说明需要与大多数海洋系统通用的多尺度时空变化兼容的代表性分层和复合采样设计。对于将来尝试定量评估和监测这些化合物在自然界中的发生和影响的尝试，必须使用这种采样设计。

著录项

  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第3期|P.322-328|共7页
  • 作者

    Dayana Moscardi dos Santos; Bruno Sampaio SantAnna; Daniela Corsino Sandron; Sara Cardoso de Souza; Joyce Cristale; Mary Rosa Rodrigues de Marchi; Alexander Turra;

  • 作者单位

    Chemical and Geological Oceanography Department, Oceanographic Institute, University of Sao Paulo, 05508-900 Sao Paulo, SP, Brazil;

    Biological Oceanography Department, Oceanographic Institute, University of Sao Paulo, 05508-900 Sao Paulo, SP, Brazil Zoology Department, Institute of Biosciences, UNESP-Paulista State University, 13506-900 Rio Claro, SP, Brazil;

    Analytical Chemistry Department, Institute of Chemistry, UNESP-Paulista State University, 14800-900 Araraquara, SP, Brazil;

    Analytical Chemistry Department, Institute of Chemistry, UNESP-Paulista State University, 14800-900 Araraquara, SP, Brazil;

    Analytical Chemistry Department, Institute of Chemistry, UNESP-Paulista State University, 14800-900 Araraquara, SP, Brazil;

    Analytical Chemistry Department, Institute of Chemistry, UNESP-Paulista State University, 14800-900 Araraquara, SP, Brazil;

    Biological Oceanography Department, Oceanographic Institute, University of Sao Paulo, 05508-900 Sao Paulo, SP, Brazil;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    organotin; estuarine chemistry; organic compounds; sediments; pollution monitoring;

    机译：有机锡河口化学;有机化合物;沉积物污染监测;

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