An experimental and theoretical evaluation of the nitrous oxide-acetylene flame as an atomization cell for flame spectroscopy

Speclm&hicaAN,Vol. 31B,pp.229to230.Perg11monPrrm 1916.PtintdinNonhem~

An experimental and theoretical evaluation of the nftrons

oxide-acetylene flame as an atomization cell for flame spectroscopy

J. 0. RASMUSON,V. A. FASSEL and R. W. KNISELJZY,Spectrochim. Acta 28B, pp. 365-406 (1973). A TYPOGRAPHICAL error in our computer program caused the formation constant of CO to be also used for CO* in the calculation of natural flame species in N,0/C2H2 flames. Figure 1 shows the corrected composition results for temperatures measured at 6 mm above the burner tip. Carbon dioxide is the only species appreciably affected, having increased in concentration by about an order of magnitude compared to the original work. Fortunately, these corrections have no effect on the flame chemistry in the carbon-rich flames to which our work was particularly directed. Thus, the three conclusions of the study remain unchanged. The error does slightly lower the calculated concentrations for atomic

1.10= 16

18

20

22

p (FLOW

24 RATIO

N20/C2H2

Fig. 1. 229

26

26 1

30

230

J. 0.

‘6”

V. A. FASSELand R. W. KNISELEY

RASMUSON,

I 16

I 18

I 20

,, (FLOW

I 2.2

I 26

I 24

RATIO

N20/C2H2

I

I

28

30

)

Fig. 2.

oxygen and carbon in leaner flames. The corrected values along with uncorrected atomic oxygen partial pressures are shown in Fig. 2. The lower values for atomic oxygen increase calculated degrees of metal atomization in these flames. Thus slightly better agreement would be observed between calculated relative number densities as a function of the oxidant to full ratio for Mg, Li and Be in the leaner flames. Slightly worse agreement for Al would also be observed. The behavior of the other metals in N20/C2H2 flames would remain unaffected. We thank Drs. C. TH. J. ALKEMADEand P. J. TH. ZEEGERSfor directing our attention to this problem.