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Assuming initially O 20 ppm and S 30 ppm, first form La2O3 and when O decreased to about 4 ppm La2O2S would form and La2S3 might form.
Under these assumptions and assuming no formation of La2S3 would expect 0.0094 wt.% La to be associated with La2O3 and 0.027 wt.% La to be associated with the formation of La2O2S.
These assumptions suggest an addition of 0.036 wt.% La would be required to getter all the S and O at initial levels of 0.003 and 0.002, respectively.
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