The existence of interelemental
interferences in flame AAS has long been well
known*,’ For the elements considered in this work no
definite inter-elemental interference has been reported,
except a slight depression in the absorbance signal of
nickel in the presence of iron”. However, important
changes in signals have been reported due to ionization
effects for vanadium in the nitrous oxide-acetylene flame
and for sodium in the air-acetylene flame”*“. To
account for this effect a suppressant is usually added; for
sodium it is normally controlled by adding 2000 ppm K
to standards and samples”. Aluminium has been used
by other authors” to suppress the ionization effect
for vanadium. In Figure 3, the effect of aluminium
concentration on the absorbance signal of vanadium is
presented. According to this figure, there is an initial
strong enhancement of the signal up to -300 ppm Al,
followed by a smoother increase to 1000 ppm of Al. For
higher concentrations the signal tends to be stable.
The existence of interelemental
interferences in flame AAS has long been well
known*,’ For the elements considered in this work no
definite inter-elemental interference has been reported,
except a slight depression in the absorbance signal of
nickel in the presence of iron”. However, important
changes in signals have been reported due to ionization
effects for vanadium in the nitrous oxide-acetylene flame
and for sodium in the air-acetylene flame”*“. To
account for this effect a suppressant is usually added; for
sodium it is normally controlled by adding 2000 ppm K
to standards and samples”. Aluminium has been used
by other authors” to suppress the ionization effect
for vanadium. In Figure 3, the effect of aluminium
concentration on the absorbance signal of vanadium is
presented. According to this figure, there is an initial
strong enhancement of the signal up to -300 ppm Al,
followed by a smoother increase to 1000 ppm of Al. For
higher concentrations the signal tends to be stable.
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