The O mode determines total oxygen from 0.01% (depending on sample types and weights) to high percentage levels. The method is generally applied to organic compounds but it can determine oxygen in many inorganic materials. The O method has almost unlimited resolution of the oxygen peak which allows the analysis of larger samples when required. Where the oxygen values are likely to be very low it is possible to use higher sample weights and/or increase the gain of the instrument to achieve a better signal to noise ratio.

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