一种量化方法来测量来自黑页岩 (加拿大新斯科舍省) 的元素排放动力学
N J O'Driscoll1, L Evans2, M Mallory3
1Earth and Environmental Science Department, Acadia University, 32 University Avenue, Wolfville, Nova Scotia, Canada. nelson.odriscoll@acadiau.ca.
Bulletin of environmental contamination and toxicology
|October 29, 2023
概括
一种新方法使用金陷原子光谱学分析岩石的 (Hg(0) 排放. 黑色页岩样本释放的量明显高于花岩或玄武岩,表明岩石的特性各不相同.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 分析化学 分析化学
背景情况:
- 地质构成中的 (Hg(0)) 排放令人担忧.
- 了解影响释放的岩石特性对于环境监测至关重要.
研究的目的:
- 开发和验证用于分析岩石样本Hg(0) 排放的受控室方法.
- 量化Hg(0) 释放率从不同的基岩类型.
主要方法:
- 使用连续黄金陷原子光光谱学 (AFS) 与Tekran 2537X分析仪.
- 采用受控室方法,分析新斯科舍州基岩样本在170°C的Hg(0) 排放.
- 在30分钟的间隔内收集大量的室内空气 (45升),以进行敏感的检测.
主要成果:
- 黑色页岩样本显示,在350小时内,与花岩和玄武岩 (0.0%-0.3%) 相比,Hg(0) 释放量 (1.1%-4.1%的总Hg) 显著增加.
- 黑页岩的伪第一阶排放速率常数在0.015-0.245h-1 (平均0.063h-1) 之间.
- 黑页岩的24小时零级排放率为0.41-3.54 ng h-1 (平均1.4 ng h-1),远高于其他样本.
结论:
- 开发的AFS方法有效量化中等质量岩石样本的Hg(0) 排放量.
- 岩石类型,特别是黑页岩,显著影响Hg(0) 排放率.
- 这种技术为岩石特性及其相关的排放特征提供了宝贵的见解.
相关概念视频
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...
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...
Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Non-destructive Tests for Concrete Strength
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...


