Huoxiang Zhengqi Water's Ethanol Amount Inspection (Gas Chromatography)
test record
Calibration factor determination: Precisely measure 4ml, 5ml, 6ml of absolute ethanol and place them in 100ml measuring flasks respectively.
Precisely add 5ml of n-propanol (as internal standard substance) respectively, dilute with water to the mark, shake well, and measure 10ml respectively , Put them in a 50ml measuring flask, add water to dilute to the mark, shake well, take the above three solutions and inject 1ul respectively
.
Table 19-18 Gas Chromatography Determination of Huoxiang Zhengqi Water Ethanol Amount Correction Factor Test Results
Preparation of the test solution: accurately measure 10ml of this product, place it in a 100ml measuring flask, add 5ml of n-propanol , add water to dilute to the mark, shake well, accurately measure 10ml, place it in a 50ml measuring bottle, add water to dilute to the mark , Shake well, and inject 1ul
.
Table 19-19 Gas Chromatography Determination of Huoxiang Zhengqi Water Ethanol Amount Test Results
Result: 44%
Standard stipulation: should be 40%～50%
Huoxiang Zhengqi Water's Ethanol Amount Inspection (Distillation Method)
test record
Take the test product, shake well, adjust the temperature to 20℃, accurately measure 25ml, place it in a 250ml separatory funnel, add about 50ml of water, add sodium chloride to saturate it, and extract 3 times with petroleum ether , and divide the lower layer of water.
, Distilled and determined
.
Balance model: CT225
Unit: g
Measuring method: distillation method
Measuring temperature: 20℃
Weight of empty pycnometer: 11.
4960
Weight of empty pycnometer plus test solution: 20.
9395
Weight of empty pycnometer with water: 21.
1945
Calculation formula
Look up the relative density of the test product in the ethanol relative density table of 0.
9737, and the corresponding concentration is 21.
5 (%) (v/v).
If the ethanol content is higher than 30%, the percentage of ethanol contained will be compared with 2 multiply
.
Ethanol content (%)=21.
5%×2=43%
Result: 43%
Standard stipulation: should be 40%～50%
Conclusion: meet the regulations
Related links: Inspection of the total amount of wet itching aerosol spray, inspection of the total number of presses per bottle of Yansukang aerosol
