Optimizing the Nebulizer Gas Flow Using the Yttrium Bullet

Issue

Optimizing nebulizer gas flow.

Environment

• iCAP 6000 Series
• iCAP 7000 Series
• iCAP Pro

Resolution

Yttrium is a very useful element to assist in optimizing the nebulizer gas flow because it’s gives off different colored light in the various regions of the plasma (Initial Radiation Zone (IRZ), Normal Analytical Zone (NAZ) and plume). The goal is to get the NAZ positioned correctly so that the emission is being optimally viewed. In order to do this, the IRZ, also referred to as the bullet when viewed while aspirating Yttrium of a sufficient concentration, can be adjusted in respect to the coil.

Prerequisites: The load coil must be aligned properly. For a radial torch, the bottom of the coil should be 1/8” or appr. 3mm away from the top of the inner quartz tube. For a Duo torch, the right-hand side of the coil should be 1/8” or appr. 3mm away from the top of the inner quartz tube. This knowledge article can be referenced for a visual on coil alignment: E2208: Plasma won't ignite

1)    Aspirate a solution containing between 500-1000ppm of Yttrium

2)    Adjust the nebulizer gas flow until the top of the bullet (IRZ) is appr. 1-2mm above the coil for a radial torch and 1-2mm to the left of the coil for a Duo torch (see Figure 1).