The analysis of a plasma impurity composition in many plasma systems (such
as coaxial plasma accelerators, magnetic-plasma compressors, plasma-focus d
evices, and others) is of great importance for plasma physics. In this work
we have proposed a new spectral method for the determination of impurity c
oncentrations in relation to the concentration of the main plasma (made of
hydrogen in our case). This technique can be used e.g. for diagnostics of a
peripheral zone in Plasma-Focus (PF) discharges, where LTE conditions must
be fulfilled. Advantages of this method in comparison with other methods,
as well as possible errors, are considered and discussed.