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Gravimetry: Overview01:05

Gravimetry: Overview

Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...

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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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使用多种观察方法对垃圾填埋场甲排放量进行比较.

Lawson D Gillespie1,2, Sebastién Ars2, Cassandra Worthy2

  • 1Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.

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概括

准确测量垃圾填埋场甲 (CH4) 排放量对于气候目标至关重要. 这项研究比较了七种方法,发现大多数加拿大垃圾填埋场的地面技术是最好的,而遥感覆盖的部分较小.

关键词:
排放量排放排放量排放量排放量排放量排放温室气体的温室气体是什么垃圾填埋场是一个垃圾填埋场.甲是一种甲.建模建模模型是什么卫星卫星卫星卫星卫星卫星卫星卫星卫星.废弃物 废弃物 废弃物 废弃物

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科学领域:

  • 环境科学 环境科学
  • 大气化学 大气化学
  • 遥感 遥感 遥感 遥感

背景情况:

  • 垃圾填埋场是加拿大人为甲 (CH4) 排放的主要来源.
  • 准确量化CH4排放对于减缓气候变化和验证排放清单至关重要.
  • 垃圾填埋场排放的变化和现场地形构成重大量化挑战.

研究的目的:

  • 为了比较加拿大垃圾填埋场七种不同的甲排放量化策略和平台的有效性.
  • 评估各种遥感和现场方法的适用性,以量化不同检测限度的垃圾填埋场CH4排放量.
  • 确定哪些方法最有效地覆盖了加拿大大多数垃圾填埋场.

主要方法:

  • 基于地面,基于飞机和基于卫星的遥感技术的比较.
  • 包括基于地面的固定,移动和基于飞机的现场观测策略.
  • 利用了3.5年的监测期,包括28个月的低精度传感器网络部署.

主要成果:

  • 所有的方法量化了广泛的甲排放率 (大约200-2000 kg·h-1).
  • 在不同的方法中,在相关的不确定性范围内达成一致的平均估计排放率.
  • 遥感方法具有更高的检测极限,适用于20-50%的加拿大垃圾填埋场,而基于地面的现场方法适用于大多数可访问的地点.

结论:

  • 基于地面的现场方法为量化来自大多数可访问的加拿大垃圾填埋场的甲排放提供了更高的检测极限.
  • 遥感技术很有价值,但其检测大量垃圾填埋场较低排放率的能力有限.
  • 对于从不同类型的垃圾填埋场进行全面的甲排放监测,可能需要组合方法.