YC/T 173-2003 Determination of potassium in tobacco and tobacco products - Flame photometry

This standard specifies the determination method of potassium in tobacco and tobacco products. This standard applies to the determination of potassium in tobacco and tobacco products. YC/T 173-2003 Determination of potassium in tobacco and tobacco products Flame photometry YC/T173-2003 Standard download decompression password: www.bzxz.net

This standard is proposed by the State Reform and Monopoly Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization (T144). The drafting unit of this standard is: Hunan Tobacco Research Institute of China National Tobacco Corporation. The main drafters of this standard are Shang Xiezhong, Zhang Huaibao, Qiu Jun, Gong Jie and Li Ping. YC/T173—2003 1 Scope Determination of potassium in tobacco and tobacco products Flame photometry This standard specifies the method for determination of potassium in tobacco and tobacco products. It is applicable to the determination of tobacco and tobacco products. 2 Regulatory references
YC/T173—2003
The following clauses shall be used as the technical specifications of this standard. For documents with a production date, all subsequent amendments (excluding periodic abandonment or revision) shall not apply to this standard. However, it is encouraged to use the latest versions of these documents. For undated references, the latest version shall apply. 5T60, 1 Volume State Recommended Samples
Y/1 Whole-scale sampling plan for batch raw materials of tobacco500ml. 4.3 Use 1000ml. 4.4 Mix the potassium hydroxide solution with 0.1g/mL of 5% acetic acid (1.5mL of 5% glacial acetic acid) and 1.5mL of 5% acetic acid. 5.1 Use photometer. 5.2 Use circulating furnace: 5.3 Use electric heating or electric heating to mix 0.1g/mL of 5% acetic acid. rl..
Net.5ml.,1oml.,15mJ..20ml.,5.7
Secret city or Jinshi field
5.3 Reporting device.
YC/T1732003
o Sampling
6.1 Porridge leaves
According to Y5, the leaves should be used as laboratory samples.
6.2 Cigarettes
According to (T06.1 Sampling garbage as experimental samples. 7 Analytical steps
7.1 Preparation of laboratory samples Preparation of analytical samples according to Y/T3: 7.2 Determine the number of replicates of the sample. 7.3 Determination of water content. Connect the sample to the designated points in the Y hole. 7.4 Preparation of the test sample. The sample to be stimulated can be selected from the following methods. 7.4.1 Acetic acid uptake method. Take 0.25 g of the sample and adjust to 0.0 c9: g. Place it in a 150 ml Erlenmeyer flask and shake at 5 μm for 1.6 % acid. 7.4.2 Dry ash method Www.bzxZ.net
Accurately weigh 10.5 (151 cm) sample and place in a homogenizing pot (5.5 cm), incubate on an electric hot plate until smokeless. Incubate in a furnace for 5.2 h until there are no particles. If the ash is not completely evaporated, add a drop of flammable gas after cooling. After cooling, take the ash-treated sample, moisten it with a little raw water, and add a little hydrochloric acid (4.3; ... Component loss: After the effect has eased, add more acid to fully dissolve the solution: the total solution reduced to about 1 ml (4.2). Transfer the standard substance to the furnace (add stone net), adjust to 2.0 ml with water. This is the solution for tobacco leaf evaluation. Make changes in time: 7.5. Accurate preparation of the series of standard solutions. Only the instrument for the inhibition of slow detection is included. Use the working standard solution (4.1) to make a series of standard solutions with not less than five concentrations. 7.6 Determination 7.6.1 Drawing of the working curve On the adjusted instrument: 1. Set the series of standard concentrations to 7.1 respectively. Take the instrument display cumulative absorption value as the ordinate. Draw a horizontal line of the standard series solution's absorption value. 7.6.2 Details of sample calibration and quantitative absorption: The sample shall be measured under the specified absorption rate using a flame ionometer (3) according to the instrument manual, and the sample measurement readings (A) and the instrument display readings (B) shall be recorded respectively. The absorption value shall be expressed as: pV.V,×1.2046×10-t
, and the mass fraction of potassium (K) in the total sample shall be calculated according to the formula (1) based on the absorption curve. The absorption value is expressed as: pV.V,×1.2046×10-t
, where:
1. 1204 8
Mass fraction of potassium (K.0) in the sample, %: YC/T173-2003
Method - absorbance value is the value of the sample on the instrument display (A) minus the value of the instrument display (A,> the corresponding silver unit is gram per liter (mR/),
initial volume, unit is milliliter (mL); pseudo volume of the auxiliary test solution, unit is litre (ml); output conversion factor of oxidation intelligence;
mass fraction of oxygen in the sample, unit is gram (R)
sub-volume, unit is (L);
-, the water content of the test rod is divided into two parallel determinations, the average value of the two parallel determinations is the determination result, the code is 0.01, 9 the difference between the two determinations should not be greater than the arithmetic mean of the two set values.
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