Test method for pH of tobacco water extract

A test method and technology of water infusion, which is applied in the field of pH test of tobacco water infusion, can solve the problems of cumbersome operation, long time consumption, unspecified test time and test temperature, etc., so as to simplify operation steps and improve accuracy Degree, the effect of test condition optimization

Inactive Publication Date: 2010-07-14
CHINA TOBACCO GUANGDONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is cumbersome to operate and takes a long time (it takes at least 1.5 hours to comple

Method used

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  • Test method for pH of tobacco water extract
  • Test method for pH of tobacco water extract
  • Test method for pH of tobacco water extract

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Experimental program
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Embodiment 1

[0016] The comparison of embodiment 1 this method and existing test method

[0017] This method: take 5.0g of tobacco powder in a conical flask, add 50ml of distilled water; place the conical flask in a vibrator, and vibrate mechanically for 0.5h; Set it up and test it directly with a pH glass electrode, and the measurement result is pH1. Ten different samples were tested in the experiment, and the results are shown in Table 1.

[0018] Prior art (YC / T 22——22007): Take 5.0g of tobacco powder in a conical flask, add 50ml of distilled water; place the conical flask in a shaker, and vibrate mechanically for 0.5h; The bottle was placed in a dark place and stood for 1 hour; after standing, the supernatant in the Erlenmeyer flask was poured into a glass beaker, and tested with a pH glass electrode, and the measured result was pH2. Ten different samples were tested in the experiment, and the results are shown in Table 1.

[0019] Table 1 This method compares with existing test met...

Embodiment 2

[0022] The impact of embodiment 2 testing time on measurement result

[0023] Take 5.0g of tobacco powder in a conical flask, add 50ml of distilled water; place the conical flask in a vibrator, and vibrate mechanically for 0.5h; Test with a pH glass electrode. In the experiment, the fixed test temperature is 20°C, and the test is performed every 30 seconds, and the test is carried out continuously for 10 minutes, with a total of 20 tests. Experimental results such as figure 1 shown.

[0024] from figure 1 It can be seen that in the first 120s of the test time, the pH values ​​at each time point differ greatly, and the pH value deviation from the test starting point to 120s is 0.02; after 120s, the test results gradually stabilize, and the pH values ​​tested at 120s and 600s The deviation is 0.03. This shows that, in order to obtain accurate test results, the test time should be continuously tested for at least 120s, and the test result at 120s is taken as the measured val...

Embodiment 3

[0025] The influence of embodiment 3 test temperature on measurement result

[0026] Take 5.0g of tobacco powder in a conical flask, add 50ml of distilled water; place the conical flask in a vibrator, and vibrate mechanically for 0.5h; Test with a pH glass electrode. In the experiment, the same tobacco sample was taken, and the above operation was repeated, and tested at five temperatures of 10°C, 20°C, 30°C, 40°C, and 50°C, and tested at intervals of 30s. The total test time was 2h. Experimental results such as figure 2 shown.

[0027] from figure 2 It can be seen that with the prolongation of time, the pH value of the sample solution also shows different changes. At 10°C, the pH value is on the rise with the prolongation of time, and the rate v=□pH / □t=0.023 / h; at 20°C At 30°C, the pH value shows a downward trend with time, v=□pH / □t=0.0145 / h; at 30°C, the pH value shows a downward trend with time, v=□pH / □t=0.0305 / h ; At 40°C, the pH value decreased with time, v=□pH / □t=...

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Abstract

The invention discloses a test method for pH of a tobacco water extract. The test method of the invention comprises the following steps: (1) putting 5.0g of tobacco powder in a conical flask and adding 50ml of distilled water; (2) putting the conical flask in an oscillator and mechanically oscillating for 0.5h; and (3) after the oscillation is finished, pouring the tobacco water extract in a glass beaker, carrying out test by directly using a pH glass electrode without putting aside the tobacco water extract. By using the method of the invention to test the pH of the tobacco water extract and under the condition that the accuracy of the measurement result is ensured, the operation steps are simplified, testing time is saved, and synchronously, the conditions, such as testing temperature, testing time and the like, are optimized, the interference of conditional factors to the test result is reduced, and the accuracy of the measurement result is further improved.

Description

technical field [0001] The invention relates to the test of the pH of the tobacco water extract, in particular to the simplification of the pH test steps of the tobacco water extract and the optimization of the test conditions. The method saves the test time and improves the accuracy of the measurement results. Background technique [0002] Tobacco is a complex mixture, the pH value of its water extract reflects the relative content of acidic and alkaline substances in tobacco, and the content of acidic and alkaline substances in tobacco is crucial to the smoking quality of cigarettes role. Therefore, the accurate determination of the pH value of the tobacco water extract provides an important index for the cigarette formulation design. [0003] At present, the prior art tobacco industry standard YC / T 222——2007 Determination of pH Value of Tobacco and Tobacco Products specifies the test steps for the pH value of tobacco water infusion. However, this method is cumbersome to...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N1/38
Inventor 张优茂
Owner CHINA TOBACCO GUANGDONG IND
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