 | To determine the nitrogen content by the Schlösing-Schulze-Tiemann method, a precision-weighed amount of nitrocellulose is heated in the presence of iron(II) chloride and hydrochloric acid. Under these conditions nitrate is reduced to NO, which can be measured volumetrically and is proportional to the nitrogen content of the nitrocellulose. Comparison tests applying automated methods for determining the nitrogen content have repeatedly showed that the Schlösing-Schulze-Tiemann method was the most reproducible method, showing the least variations of individual readings from the mean value.
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