Teledyne CETAC - Model U5000AT+ - Ultrasonic Nebulizer for ICP-AES/ICP-MS

AutoTune Power Supply
CETAC`s AutoTune Power Supply automatically senses changes in sample composition to ensure uniform and consistent aerosol generation. This AutoTune feature permits continuous use of the nebulizer even in the absence of a sample, allowing unattended operation.

Efficient Desolvation System
The U5000AT+ features a built-in desolvation system with a Peltier-cooled condenser. Dedicated teperature controllers allow fine adjustment of heater and condenser temperatures for best analytical performance. See schematic at right.

Detection Limits
Detection limits obtained with the U5000AT+ on ICP-AES are listed below for both radial and axial ICP torch configurations. Detection limits are improved in a range of 5 to 25 times, depending upon the analyte. The U5000AT+ may also be coupled with an ICP-MS, providing sub-ppt detection limits for many elements, particularly the platinum group elements (PGEs), the rare earth elements (REEs) and the actinides.

Utilizing the U5000AT+ for Aqueous Samples by ICP-AES
The CETAC U5000AT+ improves detection limits on any ICP-AES by factors of 5 to 25. This improvement in ICP-AES detection limits allows the transfer of significant amounts of work from Graphite Furnace AA to ICP-AES, where sample throughput is much greater.

Signal Stability
Long-term (10-hour) signal stability with the U5000AT+ for 500µg/L Pb spiked into drinking water is shown in the chart at right. Note the average stability is excellent at 0.40% RSD. (Each data point represents the mean of 180 ten-second measurements.) No internal standard was used in the stability experiment.

Signal Stabilization and Sample Rinse-Out
Signal stabilization, (Click figure on right), with the U5000AT+ is rapid, with signal reaching its plateau approximately 12 seconds after the sample reaches the ultrasonic transducer. Sample rinse-out is also fast, with the analyte concentrations decreasing to background levels after approximately 25 seconds. Sample and rinse solution (1% HNO3) uptake rate was 2.0 mL/min.

Modular Design
The CETAC U5000AT+ is equipped with a modular nebulizer/desolvation system. All wetted parts of the U5000AT+ are within this user removable module.

ICP-AES instrumentation allows users to measure elements at high (ppm) and low (ppb) concentrations. A second (optional) nebulizer/desolvation module may be used to alleviate sample memory effects and simplify nebulizer cleanup. Changeover from one module to another takes less than five minutes.