ASXPRESS PLUS Rapid Sample Introduction System Operator’s Manual
Chapter 6: Installing the Valve/Pump Module
73
Optional: Installing an Internal Standard Addition
Mixing Tee
The optional internal standard addition mixing tee provides a practical and
consistent way to dose each sample with an internal standard. This technique
is commonly used to correct for a variable matrix or plasma-related effects.
Figure 6-6 Internal Standard Addition Mixing Tee
1 Connect short lengths of tubing to the fittings.
You may need to experiment with the tubing lengths. Be careful to minimize
the length of tubing between the output of the 6-port valve and the
instrument's nebulizer.
Figure 6-7 Tubing for the Standard Addition Mixing Tee
2 Connect the yellow line to the internal standard reservoir. Do not connect the
yellow fitting to anything yet.
3 Connect the red line to the nebulizer.
4 Connect the blue line to port #5 of the 6-port valve.
5 Screw the blue fitting into one of the outside ports of the tee.
6 Screw the red fitting into the center port of the tee.
7 Screw the yellow fitting into the remaining outside port of the tee.
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