YC/T 162-2002 Determination of chlorine in tobacco and tobacco products - Continuous flow method

This standard specifies the determination method of chlorine in tobacco. This standard applies to tobacco and tobacco products. YC/T 162-2002 Determination of chlorine in tobacco and tobacco products Continuous flow method YC/T162-2002 Standard download decompression password: www.bzxz.net

ICS 65.160
Registration number: 10592—2002
Tobacco Industry Standard of the People's Republic of China
YC/T 162—2002
Tobacco and tobacco products
Determination of chloride
Continuous flow method
Tobacco and tobacco products--Determination of chlorideContinuous flow method
Published on September 12, 2002
State Tobacco Monopoly Administration
Implemented on December 1, 2002
YC/T162—2002
This standard is proposed by the State Tobacco Monopoly Administration. Former
This standard is under the jurisdiction of the National Tobacco Standardization Technical Committee. The drafting unit of this standard: National Tobacco Quality Supervision and Inspection Center. The main drafters of this standard: Liu Huimin, Wang Fang, Li Rong, Li Ping. 416
1 Scope
Determination of fluorine in tobacco and tobacco products
Continuous flow method
This standard specifies the method for determining chlorine in tobacco. This standard applies to tobacco and tobacco products. 2 Normative references
YC/T 162—-2002
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T5606.1 Cigarette sampling
YC/T5 General principles for batch sampling of tobacco leaves
YC/T31 Preparation of tobacco and tobacco product samples and determination of moisture content Oven method 3 Principle
Use water to extract chlorine from tobacco samples. Chlorine reacts with mercuric thiocyanate to release thiocyanate, which then reacts with trivalent iron to form a complex. The reaction product is measured colorimetrically at 480nm.
Note: The same result can be obtained using 5% acetic acid aqueous solution. 4 Reagents
Use analytical grade reagents. Water should be distilled water or water of equivalent purity. 4.1 Briji35 solution (polyethoxylated lauryl ether) Add 250g Brij35 to 1L water and heat and stir until dissolved. 4.2 Color Developer
4.2.1 Mercuric Thiocyanate Stock Solution
Weigh 2.1 g mercuric thiocyanate [Hg(SCN),] into a beaker, add methanol to dissolve, transfer to a 500 ml volumetric flask, and dilute to the mark with methanol.
4.2.2 Ferric Nitrate Stock Solution
Weigh 101.0 g ferric nitrate [Fe(NO,):·9HO] into a beaker, add 15.8 ml nitric acid (HNO.), dissolve with water, transfer to a 500 ml volumetric flask, and dilute to the mark with water. 4.2.3 Color Developer
Take 300 ml of each of the thiocyanate stock solution and the ferric nitrate stock solution into a 1000 ml volumetric flask, dilute to the mark with water, and add 1 ml of Brij35.
4.3 Dilution water
Take 1000ml of water and add 1ml of Brij35.417
YC/T162—2002
4.4 Chlorine standard solution
4.4.1 Reserve solution
Weigh 0.824g of standard sodium chloride in a beaker, accurate to 0.0001g, dissolve it with water (4.3), transfer it to a 250mL volumetric flask, and dilute it to the mark with water.
4.4.2 Working standard solution
Prepare at least 5 working standard solutions from the reserve solution, and their concentration range should cover the sample content expected to be detected. 5 Instruments and equipment
Common experimental instruments and
5.1 Continuous flow analyzer (see Figure 1), composed of the following parts: - Sampler;
Proportional pump;
Spiral tube;
Colorimeter, equipped with 480nm filter;
Recorder or other data processing device.
7.70 mL heating
5.2 Balance, sensitivity 0.0001g.
5.3 Oscillator.
6 Analysis steps
6.1 Sampling
480 nm filter
2. 0mm×15mm flowing oil
violent/black (0. 32 mL/min), air
yellow/yellow (1.20 mL/min), dilution water
male/(0. 10 mL/min), sample
black/black (0.32mL/min), sample
gray/gray (1. 00 mL/min)), color developer blue/yellow (1.40mL/min), 5% acetic acid solution
fluorine determination pipeline diagram
samples are extracted according to GB/T5606.1 or YC/T5. 6.2 Prepare the sample according to YC/T31 and determine the moisture content. 6.3 Weigh 0.25g of the sample into a 50mL ground-mouth conical flask, accurate to 0.0001g, add 25mL of water, cover with a stopper, and extract on an oscillator for 30min.
6.4 Filter with qualitative filter paper, discard the first few milliliters of filtrate, and collect the subsequent filtrate for analysis. 6.5 Run the working standard solution and sample solution on the machine. If the concentration of the sample solution exceeds the concentration range of the working standard solution, it should be diluted. 418
7 Calculation and description of results
7. 1 Calculation of chlorine content
The chlorine content on a dry basis is obtained by formula (1): Chlorine (%) = m×(iw)×100
Where:
The instrumental observation value of chlorine in the sample solution, in milligrams (mg)㎡——the mass of the sample, in milligrams (mg), W—the water content of the sample.
2 Expression of resultsbZxz.net
The average value of two determinations shall be taken as the determination result, and the result shall be accurate to 0.01%. 8 Precision
The difference in the absolute value of two parallel determination results shall not be greater than 0.05%. YC/T 162--2002
（1）
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