apex Ω High Sensitivity Desolvating Nebulizer

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 HF 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

apex Ω Brochure
Nuclear Forensics
Nd Isotopes Poster Note
U Isotopes Poster Note
K Isotopes Poster Note
apex Ω Specifications
apex Ω HF Specifications

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

Minimizing the amount of Nd required to obtain desired precision (> 50 ppm) and throughput for precious oceanographic samples is illustrated in two figures. First, internal precision is for plotted for variable amounts of Nd injected at 100 µL/min for two minutes. Less than 50 ppm (2 RSD) internal precision is obtained for 2 ng samples of Nd. Repeat analysis of reference materials JNdi and La Jolla indicate that the external precision for 2 ng of Nd is similar to the 50 ppm internal precision and appropriate for oceanographic applications.

Sample Amount

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

Reproducibility for 2 ng

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

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The apex Ω sweep & N2 gas flows are optimized via software controlled MFC's. The stability of gas flow regulation is proven by 235U/238U mass bias stabilities that are typically better than 60 ppm (1 RSD) over analytical sessions of 15+ hours.

CRM Accuracy and Precision


Presented at American Geophysical Union San Francisco 2016; M. Paul Field, Nicholas S. Lloyd, and Paul Watson

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The microFAST MC and the apex Ω provide high precision potassium isotope ratios with greatly reduced uptake and wash times, thereby improving frequency of sample standard bracketing.

NIST SRM 70b Against BSW

Presented at Goldschmidt Paris 2017; Nicholas S. Lloyd, Grant Craig, Paul Watson, M. Paul Field, Leah E. Morgan, Danielle Santiago Ramos, and John A. Higgins

apex Ω and microFAST MC on Thermo Neptune

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