apex Ω High Sensitivity Desolvation System

The apex Ω desolvating nebulizer is the highest performing ICPMS sample introduction system available. An innovative multistage Peltier-cooled desolvation system combined in series with a helical EPTFE fluoropolymer membrane desolvator simultaneously maximizes ICPMS sensitivity and reduces oxides.


  • Quartz or PFA Versions Available
  • Maximize Signal Intensity
  • Integrated Software Control
  • Multiple Desolvation Stages
  • Minimize Oxides and Interferences
  • Sample flow rates from 5-400 uL/min
  • Combine with prepFAST S for Low Controlled Background
  • Combine with microFAST MC for syringe loading injection
Intuitive Software Control

Software Control

Gas Flows
  • N2 Addition
  • Ar Sweep
  • Spray chamber
  • Peltier Cooler
  • Desolvator
  • Peripump

apex Ω Brochure
Nuclear Forensics
Nd Isotopes Poster Note
U Isotopes Poster Note

Apex Omega High Sensitivity Sample Introduction System
2 3 4

Part # Description
APX-O apex Ω high performance membrane desolvation system with quartz spray chamber
APX-O-HF apex Ω HF high performance membrane desolvation system with PFA spray chamber

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Capabilities  Applications  Accessories  Specifications

High sample transport efficiency over a range of flow rates is illustrated as a linear increase in sensitivity enhancement directly correlated with increased flow rate. Typical sensitivity enhancements of 6x to 10x are observed between flow rates of 100 and 200 µL/min. Highly efficient desolvation over a typical sample flow range for most applications (5–400 µL/min) is illustrated by low oxide formation with no correlation to flow rate.

Sensitivity vs. Flow Rate

Sensitivity and Oxides

Presented at Goldschmidt Yokohama 2016; Nicholas S. Lloyd, Paul Watson, and M. Paul Field

Using only the Ar sweep and N2 gas flows, the apex Ω is tuned for two different applications, 1) minimum oxide formation (UO+ < 0.02%, 6x sensitivity) and 2) maximum sensitivity improvement (>10x, UO+ < 0.12%,). The apex Ω parameters are saved in the software as condition 1 and 2. Downloading the tune parameters in an alternating fashion (every ~ 2 mins) demonstrates immediate return of sensitivity, stability and oxide levels to previous conditions. Saving application specific tuning conditions reduces setup time and improves ease of use.

Indium Sensitivity

Uranium Oxide Formation

apex Ω stability is illustrated as both, 1) Indium signal intensity for the quartz and HF (PFA) models and 2) Nd isotope ratio precision for the quartz model. The Ω and HF versions have near identical sensitivity and long term stability (<1% RSD for > 8 hrs). Signal stability is translated into isotope ratio precision (repeatability) of less than 13 ppm (2 RSD).

apex Ω Q and HF 8 hr signal stability comparison

Isotope ratio precision

Presented at Goldschmidt Yokohama 2016; Nicholas S. Lloyd, Paul Watson, and M. Paul Field

Replicate injections illustrate greater than four orders of magnitude (10,000x) washout is achieved in 1 minute for Nd. Two percent HNO3 is used to achieve 10,000x washout for Li and Nd, whereas, classic memory prone elements such as Th are washed out similarly with 1% HF.

Replicate Injections of Nd and Blank

Washout for Various Elements

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