在低度下确定稳定的同位素组成和同位素丰富因子
Xiao Liu1, Langping Wu1,2, Steffen Kümmel1
1Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ,Permoserstraße 15, 04318 Leipzig, Germany.
Analytical chemistry
|October 25, 2023
概括
一种新的数据处理方法可以准确地确定低度有机污染物的同位素组成 (δ2H). 这种方法超越了检测极限,使环境样本的精确分析成为可能.
科学领域:
- 环境化学环境化学
- 同位素地球化学 同位素地球化学
- 分析化学 分析化学
背景情况:
- 准确确定稳定的同位素组成 (δ2H) 对环境研究至关重要.
- 目前的方法面临着低分析剂度的挑战,限制了精确的δ2H值评估和同位素丰富系数 (εH) 计算.
- 这种限制阻碍了环境样本中的污染物的分析,这些污染物通常存在于低度.
研究的目的:
- 开发一种数据处理方法,用于在分析仪器的线性范围以下准确的δ2H测定.
- 为了能够精确计算低度样品的同位素丰富系数 (εH).
- 为了促进对环境矩阵中的有机污染物的分析.
主要方法:
- 使用对数函数来适应线性范围以下得到的 δ2H 值.
- 用合适的对数方程来调整 δ2H 值到线性范围.
- 实验室的参考材料 (例如,n-) 用于校准,Tris2-chloroethyl) 酸盐 (TCEP) 和六环 (HCH) 异构体作为测试化合物.
主要成果:
- 开发的数据处理方法成功地获得了线性检测范围以下样品的精确δ2H值.
- 在使用新方法的低度和参考实验之间,可以实现可比的δ2H值和εH值.
- 该方法在分析复杂的异原子载体化合物 (如TCEP和HCH异构体) 中证明了其有效性.
结论:
- 新的数据处理方法可以在低度下准确确定有机化合物中的同位素成分.
- 这种方法显著提高了在环境样本中分析有机污染物的能力.
- 该方法为环境监测和研究提供了有价值的工具,因为污染物水平通常很低.
相关概念视频
Reduction of Alkenes: Catalytic Hydrogenation
12.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.1K
Hess's Law
45.2K
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
45.2K
¹H NMR of Labile Protons: Deuterium (²H) Substitution
902
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
902
High-Resolution Mass Spectrometry (HRMS)
1.4K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
1.4K
Mass Spectrometry: Isotope Effect
2.1K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
2.1K
Hydrogen Bonds
121.4K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
121.4K


