Analysis method for the acetylene content in the chlorination effluent of trichloroethylene
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The following is our analysis method: the colorimetric method yields a range of values; how can accurate figures be obtained? 1 mL of the sample is taken into a 10 mL colorimetric tube, followed by the addition of 9 mL of a mixed solution of hydroxylamine hydrochloride and copper nitrate (15.8 mL of hydroxylamine hydrochloride and 4.2 mL of copper nitrate). The mixture is shaken thoroughly, allowed to settle, and then compared with standard color scales at the same volume to determine the corresponding acetylene content.
What topic do you want everyone to discuss? Are there any issues with your current analysis method? If an accurate and faster analysis is required, online chromatography can be used to monitor exhaust gases, although the analysis cost will be high.
I want to know how to accurately measure the content
The seemingly simple colorimetry method you are using currently is actually quite accurate, even though color scales are employed. If a photometer is used to measure absorbance, the accuracy will be better. Don’t think that simple analysis methods are inaccurate; you know, some biochemical tests use a few plus signs or minus signs to give results that are quite accurate.
It’s unclear what the properties of your sample are; if the colorimetric method is relatively stable, and sampling and processing can ensure sufficient reproducibility, that should work as well. If gas chromatography can be used, it should be simpler and faster.
Please provide information on the sample condition; if a trace amount of acetylene is dissolved in an aqueous solution, a headspace sampler in combination with gas chromatography is a good choice.