WHAT IT IS
An HMI system optimizes the transport of samples with high dissolved solids, viscous compositions, or matrix interference into the plasma. It achieves this by reducing the sample aerosol's water load or matrix effects, allowing for stable plasma operation and minimizing risks such as deposition on the cones, signal suppression, or instability. This makes it possible to analyze complex samples without extensive preparation or dilution, enhancing analytical throughput and accuracy.
HOW IT WORKS
Sample Conditioning – The HMI system modifies the aerosol properties, often by introducing auxiliary gas flows or using specialized components to reduce the liquid load entering the plasma.
Matrix Tolerance Enhancement – By lowering the total dissolved solids (TDS) introduced into the plasma, the system mitigates the risk of signal suppression and minimizes matrix-induced interferences.
Plasma Optimization – The system ensures stable plasma operation even when handling challenging samples, maintaining high temperatures and efficient ionization.
Consistent Aerosol Delivery – The HMI system works in conjunction with nebulizers and spray chambers to deliver a homogeneous aerosol with reduced water and matrix content into the torch.
ADVANTAGES
Increased Matrix Tolerance: The HMI system effectively handles samples with high TDS, such as seawater, industrial effluents, or biological fluids, without clogging or signal loss.
Reduced Sample Preparation: Direct analysis of complex samples minimizes the need for extensive dilution, filtration, or chemical treatment, saving time and resources.
Stable Plasma Performance: By reducing the matrix load, the HMI system prevents plasma instability, ensuring consistent and reproducible results.
Enhanced Sensitivity: The system maintains high detection limits even for trace elements in challenging matrices.
Extended Component Lifespan: Lower deposition on cones and torches reduces maintenance frequency and prolongs the life of critical components.
CHALLENGES AND LIMITATIONS
Initial Cost: The HMI system adds to the instrument’s cost, making it a more significant investment for smaller laboratories.
Learning Curve: Users may need training to optimize the system for specific sample types and analytical needs.
Compatibility: While highly effective, the HMI system may not eliminate all interferences for extreme matrix compositions, requiring complementary techniques.
Energy Demand: The system may require slightly higher plasma power to maintain stability, increasing operational costs.
Custom Components: HMI systems often require specialized nebulizers, spray chambers, or torches, which may need to be replaced periodically.