What are the simple methods for crude fiber detection?
Simple crude fiber detection
Simple method for crude fiber detection
Weigh 2-5g (w) of sample into a 500ml tall beaker, pour in 200ml of boiling 1.25% sulfuric acid and bring to a gentle boil for 30min (make a mark; when the liquid level drops below the mark, add water up to the mark to maintain the concentration). When the time is up, filter through a 200-mesh gauze and rinse with hot water until the filtrate shows no white precipitate when barium chloride is added. Put the sample back into the 500ml tall beaker (be careful during the operation not to lose any sample), add 200ml of boiling 1.25% sodium hydroxide and bring to a gentle boil for 30min (make a mark; when the liquid level drops below the mark, add water up to the mark). When the time is up, filter through filter paper that has been dried at 130°C for 40min and quickly weighed (w0) (be careful during filtration not to lose any sample). Rinse thoroughly with 200ml of hot water. Rinse the sample with 20ml of ethanol at 60°C, then rinse the sample with 20ml of ether (defatting). Then place the sample together with the filter paper into a crucible and put it into an oven at 130°C for 2 hours to dry. Take it out and place it in a desiccator for 30min, weigh (W2), place it on an electric furnace to carbonize until no smoke is produced. Place it in a muffle furnace at 550°C for 30min and calcine until no carbon particles remain. Place it in a desiccator for 30min and then weigh (W1).
Result (%) = {(W2-W1-w0)/W}*100
W2 - weight after drying at 130°C;
W1 - weight after calcination;
W0 - weight of the filter paper;
W - mass of the sample.
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Bump
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How is the accuracy? Have you done any comparison experiments?
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The parallelism of our tests is quite good.
Weigh 2-5g (w) of sample into a 500ml tall beaker, pour in 200ml of boiling 1.25% sulfuric acid and bring to a gentle boil for 30min (make a mark; when the liquid level drops below the mark, add water up to the mark to maintain the concentration). When the time is up, filter through a 200-mesh gauze and rinse with hot water until the filtrate shows no white precipitate when barium chloride is added. Put the sample back into the 500ml tall beaker (be careful during the operation not to lose any sample), add 200ml of boiling 1.25% sodium hydroxide and bring to a gentle boil for 30min (make a mark; when the liquid level drops below the mark, add water up to the mark). When the time is up, filter through filter paper that has been dried at 130°C for 40min and quickly weighed (w0) (be careful during filtration not to lose any sample). Rinse thoroughly with 200ml of hot water. Rinse the sample with 20ml of ethanol at 60°C, then rinse the sample with 20ml of ether (defatting). Then place the sample together with the filter paper into a crucible and put it into an oven at 130°C for 2 hours to dry. Take it out and place it in a desiccator for 30min, weigh (W2), place it on an electric furnace to carbonize until no smoke is produced. Place it in a muffle furnace at 550°C for 30min and calcine until no carbon particles remain. Place it in a desiccator for 30min and then weigh (W1).
Result (%) = {(W2-W1-w0)/W}*100
W2 - weight after drying at 130°C;
W1 - weight after calcination;
W0 - weight of the filter paper;
W - mass of the sample.
--------------------------------------
Bump
--------------------------------------
How is the accuracy? Have you done any comparison experiments?
--------------------------------------
The parallelism of our tests is quite good.