相关实验视频

Updated: Jun 2, 2025

Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

Published on: December 10, 2015

一种新的防空采样方法用于地下水中硫六化物 (SF) 的采样

Raka Sunderland¹, Dan Larsen¹, Scott Schoefernacker¹

¹University of Memphis Department of Earth Sciences 109 Johnson Hall Memphis, TN 38152, USA.

|January 15, 2025

概括

一种新的气密采样方法提高了地下水中硫六化物 (SF) 测量的可靠性. 这种进步减少了现代空气的污染,确保更准确地评估了水的年龄.

科学领域:

环境科学环境科学
水文地质学水文地质学
分析化学分析化学

背景情况:

硫六化物 (SF) 广泛用于测定地下水的年龄不到65年.
传统的采样方法容易受到现代空气污染的影响,导致SF₆数据不可靠.
SF₆来自附近变压器的泄漏可以进一步扭曲城市地区的结果.

研究的目的:

开发和评估一种新的防空方法,用于地下水中SF₆采样.
将新方法的准确性和可重复性与传统的气敏和非气密技术进行比较.
评估现代空气污染和变压器附近对SF测量的影响.

主要方法:

一个新的密闭采样系统被设计用于将地下水样本与环境空气隔离.
在新的密封方法和两种传统采样方法之间进行了比较分析.
测量了SF₆度,并与前现代水样预期值进行了比较.

主要成果:

空气密度的方法产生了SF₆度在0.03-0.05 fmol/L的预期值的前现代水域.
传统方法显示出明显更高的可变性,结果在0.00-0.90 fmol/L和0.02-1.21 fmol/L之间.
新方法证明了可重复的低水平SF₆检测,显著减少采样错误.

结论:

与传统方法相比,新的气密方法提供了更准确和可重现的SF₆测量.
这种技术对于可靠的地下水年龄测定至关重要,特别是在具有潜在SF来源的城市环境中.
改进的方法最大限度地减少了与现代空气污染和变压器相关的SF流入相关的错误.

关键词:

对于地下水中SF6的气密采样方法.电力变压器电力变压器地下水的标志物是什么?采样采样采样硫黄六化物是一种硫黄六化物.城市地区的城市区域.

更多相关视频

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.

Published on: July 9, 2012

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Published on: August 31, 2017

相关概念视频

Sampling Methods: Sample Types

Sampling Methods: Sample Types

Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...