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首页> 外文期刊>Environmental Science & Technology >Evaluation of Spatial Variability of Soil Arsenic Adjacent to a Disused Cattle-Dip Site, Using Model-Based Geostatistics
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Evaluation of Spatial Variability of Soil Arsenic Adjacent to a Disused Cattle-Dip Site, Using Model-Based Geostatistics

机译：使用基于模型的地统计方法评估废弃的牛浸地附近土壤砷的空间变异性

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摘要

This study investigated the spatial variability of total and phosphate-extractable arsenic (As) concentrations in soil adjacent to a cattle-dip site, employing a linear mixed model-based geostatistical approach. The soil samples in the study area (n = 102 in 8.1 m~2) were taken at the nodes of a 0.30 × 0.35 m grid. The results showed that total As concentration (0-0.2 m depth) and phosphate-extractable As concentration (at depths of 0-0.2,0.2-0.4, and 0.4-0.6 m) in soil adjacent to the dip varied greatly. Both total and phosphate-extractable soil As concentrations significantly (p = 0.004-0.048) increased toward the cattle-dip. Using the linear mixed model, we suggest that 5 samples are sufficient to assess a dip site for soil (As) contamination (95% confidence interval of ±475.9 mg kg~(-1)), but 1S samples (95% confidence interval of ±2123 mg kg~(-1)) is desirable baseline when the ultimate goal is to evaluate the effects of phytoremediabon. Such guidelines on sampling requirements are crucial for the assessment of As contamination levels at other cattle-dip sites, and to determine the effect of phytoremediabon on soil As.
机译：这项研究采用基于线性混合模型的地统计方法，研究了与牛浸地点相邻的土壤中总砷和可磷酸盐提取的砷（As）浓度的空间变异性。研究区域（8.1 m〜2中的n = 102）的土壤样品取自0.30×0.35 m网格的节点。结果表明，与该浸染区相邻的土壤中总砷浓度（深度为0-0.2 m）和可提取磷酸盐的砷浓度（深度为0-0.2、0.2-0.4和0.4-0.6 m）差异很大。总体和可提取磷酸盐的土壤中砷的浓度都显着增加（p = 0.004-0.048），朝向牛群。使用线性混合模型，我们建议5个样本足以评估土壤（As）污染的浸入点（95％置信区间为±475.9 mg kg〜（-1）），而1S样本（95％置信区间为当最终目的是评估植物修复素的效果时，±2123 mg kg〜（-1））是理想的基线。此类采样要求准则对于评估其他牛场的砷污染水平以及确定植物修复素对土壤砷的影响至关重要。

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  • 来源
    《Environmental Science & Technology》 |2011年第24期|p.10463-10470|共8页
  • 作者

    Nabeel K. Niazi; Thomas F. A. Bishop; Balwant Singh;

  • 作者单位

    Faculty of Agriculture Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia;

    Faculty of Agriculture Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia;

    Faculty of Agriculture Food and Natural Resources, The University of Sydney, Sydney, NSW 2006, Australia;

  • 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
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