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相关概念视频

Sampling Plans01:23

Sampling Plans

214
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
214

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相关实验视频

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Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
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适当地处理有毒金属来源代理,以获得更好的空间异质性和来源分配.

Meiling Sheng1, Xufeng Fei1, Zhaohan Lou2

  • 1Zhejiang Academy of Agricultural Sciences, Hangzhou, China; Key Laboratory of Information Traceability of Agriculture Products, Ministry of Agriculture and Rural Affairs, China.

The Science of the total environment
|July 14, 2023
PubMed
概括

,和等有毒金属污染土壤,工业和农业活动是人类驱动的关键来源. 诸如土壤母性物质等自然因素也在很大程度上影响了不同地区的有毒金属分布.

关键词:
综合模型 综合模型风险评估 风险评估 风险评估来源分配的分配方式空间异质性 空间异质性有毒金属有毒金属

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Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
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相关实验视频

Last Updated: Jul 23, 2025

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10:44

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科学领域:

  • 环境科学 环境科学
  • 地质化学 地质化学
  • 空间分析 空间分析

背景情况:

  • 土壤有毒金属表现出显著的空间异质性,具有不同的区域来源.
  • (Pb), (Cd) 和 (Hg) 是土壤中主要的有毒金属.
  • 很大一部分土壤样本超过了Pb,Cd和Hg的背景值.

研究的目的:

  • 用综合模型量化提取不同有毒金属的主要来源代理.
  • 分析有毒金属来源分布的空间异质性.
  • 为了同时分析数值和分类变量来识别源.

主要方法:

  • 整合了Catreg和地理加权回归 (GWR) 模型.
  • 源代码的定量提取,考虑数值和分类变量.
  • 对有毒金属来源的空间分布模式的分析.

主要成果:

  • 工业活动是Cd,Hg和Pb的主要来源,特别是在城市地区.
  • 农业活动,包括过度使用化肥,有助于Cd,Hg和Pb污染.
  • 自然资源,主要是土壤母体材料,在特定地区显著影响As和Cr的积累,而坡度,土壤有机物和pH影响了整个有毒金属的分布.

结论:

  • 综合的Catreg-GWR模型有效地分析空间异构的环境数据.
  • 了解区域源贡献对于有效的污染预防战略至关重要.
  • 这种方法为针对性地控制土壤中有毒金属的局部污染提供了基础.