Plasma Torch Nitrogen Gas Injection for Lower Elemental Background
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Solution Overview
Problem
Background signals and interferences often reduce the ability to detect certain elemental species at low levels in elemental analysis.
Innovation Solution
Introducing a gas comprising a nitrogen center, such as nitrogen gas, ammonia, or nitrous oxide, into the sample introduction device or directly into the plasma torch to reduce background signals and interfering species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gas comprising a nitrogen center is introduced into the sample introduction device or plasma torch, then background signals and interfering species are reduced, but device complexity increases due to additional gas flow systems
Solution Approach 1:
A gas comprising a nitrogen center is introduced as an intermediary substance into the sample introduction device or plasma torch to reduce background signals and interfering species. The nitrogen-containing gas acts as a mediator that modifies the plasma environment to suppress interference formation, thereby improving detection limits for elemental species without requiring fundamental changes to the instrument architecture.
Solution Approach 2:
The composition of the plasma gas is modified by introducing a gas comprising a nitrogen center, changing the chemical parameters of the plasma environment. This parameter change affects the formation of background signals and interfering species, allowing for improved measurement precision. The nitrogen-containing gas alters the plasma chemistry to reduce polyatomic ion interferences and background noise.
2Measurement precision
If a gas comprising a nitrogen center is introduced into the sample introduction device or plasma torch, then background equivalent concentration is improved, but the operational complexity increases due to multiple separate gas flows
Solution Approach 1:
The gas comprising a nitrogen center serves multiple functions simultaneously: it acts as a plasma modifier to reduce background signals, functions as an interference suppressor, and contributes to plasma stabilization. This multi-functionality consolidates several operational requirements into a single gas flow system, reducing the overall operational complexity despite the advanced functionality provided.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the background equivalent concentration for certain elemental species, leading to enhanced detection limits and reduced background noise.
Implementation Method 1
use a gas comprising a nitrogen center... to reduce background signals and/or the presence of interfering species during analysis
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~2C
AI summary
Methods and systems that can use a gas comprising a nitrogen center that is introduced upstream of a plasma sustained in a torch are described. In some configurations, the gas comprising the nitrogen center can be introduced as a gas upstream of the plasma and through a sample introduction device. Mass spectrometers and optical emission systems that can use the gas comprising the nitrogen center are also described.