A: Although the plasma emission detector for the 2120XL is nitrogen-selective, other compounds including nitrogen may introduce some small positive or negative interference. The interference is non-linear over the analyzer's ranges and may be depending on the impurity and concentration.
Here is an example of interferences contributed by the impurities of a gas containing 10 ppm nitrogen, 10 ppm hydrogen, 10 ppm oxygen, 10 ppm methane and 10 ppm carbon monoxide in an argon background: 
