Direct Injection High Efficiency (DIHEN) Nebulizers

The DIHEN is a pneumatic microconcentric nebulizer designed to introduce micro-volumes of sample solutions directly into an ICP or ICPMS plasma, without a spray chamber. Applications for DIHEN include ultratrace isotope and elemental analysis of sample types that are of limited volume, toxic, or expensive, or that exhibit speciation interferences that cause transport efficiency issues in conventional spray chambers. DIHEN can introduce microvolumes into plasmas at 1- 100 µL/min, with relatively small aerosol droplet size, and with nearly 100% use of the sample.

DIHEN is designed to operate at 1 L/min Ar at 170 psi (typically). However most applications run at a lower flow rate, closer to 0.40 L/min. At that rate, the psi required is approximately 70 psi. Similarly, a 120 psi DIHEN will require a pressure of approximately 50 psi, which is compatible with most instrument nebulizer supplies.

Also of note is that higher flow rate DIHEN designs can be used to prevent clogging. For example, if the application design calls for a 100 µl/min, a DIHEN 300 µl/min can be used to avoid clogs. It is highly recommended that a pump be used to control solution flow between 5 uL/min and 300 uL/min.

To use the DIHEN, an adapter is required so that the DIHEN can replace the injector and injector support adapter in a typical demountable torch. These adapters are available for most ICPMS instruments, as well as for many ICP instruments.

For DIHEN, Fit Kit #1 Micro offers a simple and convenient method to reduce dead volume in the sample transfer line to less than 10 µL. Fit Kit 1, the F1-series, and the F2-series of solution connections are also compatible. For the gas connection, the FG fitting eases connection of a high-pressure Argon line to the sidearm of the DIHEN while the F4 gas connection works with 4 mm PTFE tubing to as much as 90 psi. Fit Kit 2 is a modified Swagelok union that adapts a ¼” gas line to supply as much as 180 psi.

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