ICP Ion Source Inert Gas Sleeve for Oxygen Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inductively coupled plasma (ICP) ion sources operating in atmospheric pressure and air environments are interfered with by oxygen, leading to inaccurate determination of elemental content and isotopic composition due to oxide formation, particularly affecting rare earth elements and oxygen isotope measurement.
Innovation Solution
An oxygen reduction device is introduced, featuring an inflation sleeve and torch configuration that isolates the ion source region from the external environment using an inert gas, creating a pressure difference and reducing oxide formation by surrounding the ion source flame with inert gas, which is discharged through a gas outlet gap to further prevent oxygen interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ICP ion source operates in atmospheric pressure and air environment, then the ion source can function normally with simple structure, but oxygen in air enters the ion source to form oxides that severely interfere with accurate determination of elemental content and isotopic composition
Solution Approach 1:
The patent applies inert atmosphere principle by introducing a protective gas (argon or nitrogen) flow around the ion source flame. A gas guiding protrusion extends from the torch assembly to direct the inert gas flow, creating a protective envelope that prevents atmospheric oxygen from entering the ion source region. This inert gas barrier effectively eliminates oxide formation while maintaining the simplicity of the conventional ICP ion source structure.
Solution Approach 2:
The gas guiding protrusion acts as an intermediary structure that mediates between the inert gas supply and the ion source flame. It directs and shapes the inert gas flow to optimally surround the flame, creating an effective oxygen barrier. This intermediary component is simple in design (a protruding structure) but effectively resolves the oxygen interference problem without adding complex subsystems.
2Measurement precision
If the ion source region is isolated from external environment using inert gas, then oxide formation is reduced and measurement accuracy improves, but the device structure becomes more complex with additional components
Solution Approach 1:
The patent merges the gas guiding function directly into the torch assembly by incorporating a gas guiding protrusion as an integrated component. Rather than adding a separate complex shielding system, the protective gas flow guidance is combined with the existing torch structure, eliminating the need for additional isolated shielding components and reducing overall system complexity.
Solution Approach 2:
The patent uses a flexible gas flow approach rather than rigid physical barriers. The inert gas forms a flexible protective envelope around the ion source flame, adapting to the flame shape and movement. This gas-phase shielding is simpler than constructing rigid vacuum chambers or complex mechanical shields, achieving effective isolation with minimal structural addition.
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
The device effectively reduces oxygen interference, improving the accuracy of elemental and isotopic analysis by minimizing oxide formation and extending the distance oxygen can enter the ion source flame, thereby enhancing the precision of ICP mass spectrometry.
Implementation Method 1
creating a pressure difference and reducing oxide formation by surrounding the ion source flame with inert gas
Implementation Method 2
surrounding the ion source flame with inert gas, which is discharged through a gas outlet gap to further prevent oxygen interference
Data Source
AI summary
An oxygen reduction device in an ion source region of inductively coupled plasma is provided. The oxygen reduction device includes a torch and an inflation sleeve. An upper end of the inflation sleeve is sealed and sleeved outside the torch, and a lower end of the inflation sleeve and the torch are arranged at an interval to form an inflation gap. An inflation hole communicating with the inflation gap is formed in an outer side wall of the inflation sleeve. An outer side face of the lower end of the inflation sleeve is protruded outwards to form an annular gas guiding protrusion. The annular gas guiding protrusion is configured for being arranged opposite to a sampling cone base arranged below the torch, and a gas outlet gap is formed between the annular gas guiding protrusion and the sampling cone base.