This standard specifies the determination method of calcium in tobacco and tobacco products. This standard applies to the determination of calcium in tobacco and tobacco products. YC/T 174-2003 Determination of calcium in tobacco and tobacco products Atomic absorption method YC/T174-2003 Standard download decompression password: www.bzxz.net

This standard is issued by the State Tobacco Monopoly Administration. Foreword
This standard is under the jurisdiction of the National Tobacco Standardization Technical Committee (T144). Drafting list of the standard: Guzhou Tobacco Research Institute of Zhongzhou Tobacco Corporation, the main drafters of this standard, Zhang Huaibao, Xiao Xieji, Qiu Jun, Tu Fang, Xue Chong YC/1174-20C3
1 Scope
Determination of calcium in tobacco and tobacco products
Atomic absorption method
This standard specifies the determination method of calcium in tobacco and tobacco products. VI. This standard is applicable to the determination of calcium in tobacco and tobacco products 2. Normative references
YC/F 1/4--2003
The clauses in the following documents are incorporated into the clauses of this standard by reference in this standard. All the provisions of this standard shall apply. ! All amendments to this document (excluding errata) after the revision are not applicable to this standard. However, the parties to this standard can confirm whether the latest version of this document can be used. For any referenced document without a reference date, its latest version applies to this standard. H1560e.1 Volume
YC/T5 Sample collection of batch raw materials (YC/T51992e01S)1R74:159:) YC/T31 Preparation and moisture determination of test baskets for tobacco and tobacco products by oven method (YC/T31196.cQIS2951:19
3 Processing
The product is dried and treated with acid and the solution is selected. To the appropriate concentration range, the absorption spectrometer was used to determine the absorption of calcium.
4 Reagents
The reagents listed in this standard are all of analytical purity. Second, deionized water or water of equivalent purity: 4.1 Hydrochloric acid (HCl) 1.19 g/m]
4.2 Hydrochloric acid solution (Ht:1) = emol1/L]. Take hydrochloric acid (4.1> 500m.530ml. Water, 4.3 Hydrochloric acid (concentration [1-mnl]) 4. Dilute with water. 4.4 Chlorinated chloride (HCl) 50g/L) [1.tl, HCl, H2O, L (H2O) = 451130 dissolved in water, dilute with water ≤1. www.bzxz.net
4.5 Calcium standard stock solution) = 10m. Use GWE02 calcium standard material for analysis) 4.6T as standard solution (gtC) = inmg/1., absorb calcium standard stock solution (4.G>5.uUJmL to 100-l, put it in the plate.
5 Receiver equipment
5.1 Original absorption spectrophotometer:
5.2 Calcium method heart Lang dial lamp, can be the same as the original For absorption spectrophotometer (5.) 5.3 air-fire system, can be restored to the original love-female spectrophotometer (5.1 month. 5.4 porcelain consumption
5.5 black width good
5.6 Xie temperature furnace or hot plate,
5.7 break people level, the maximum sensitivity 0.1 more.
YC/T174-2CC3
5.8 capacity band ..ml.r..onl.
5.9 more liquid reputation.2 mi..5 ml..o mI..G Sampling
6.1 Tobacco leaves are used as test samples according to Y5,
6.2 Old plan
Technical GBT5506.1 Take cigarette oil as test sample: Analysis steps
7.1 Sample preparation
Control: YLT21 Prepare analysis sample
2 Determination times
Each sample shall be measured in parallel for not less than two times. 7.3 Determination of moisture content
The moisture content of the selected sample shall be determined by YT3,
7.4 Preparation
7.4.1 Take (.50U=0.00C5) sample accurately in vortex [5.4), turn on, heat on electric hot plate until it is dry, then dry until it is heated to 5000 g/cm2, heat until it is effective. If the solution is completely dissolved, take a portion and add a drop of effective acid. After cooling, re-decompose the solution at low temperature: 7.4.2 After cooling, wet the solution with a small amount of water, add a small amount of hydrochloric acid (4.2) several times, and be careful to eliminate the residual fat. After that, add about 10mL of hydrochloric acid <4.2>. 7.4.3 Transfer the solution to a furnace (such as a stove) and heat it to boiling. Transfer the hot water to a 253ml volumetric volume, make up to volume, shake the sample to be tested, and perform a bucket test on it. 7.5 Preparation of standard solutions: Take calcium working standard solution (4.61,000mL, 2.000mL, 3.00mT, 4.n2) ​​ml, 3.000mL respectively in a 50mL volumetric flask, add the solution (4.4>mL, make the concentration reach about: 1(\R/Tr volume of this series T as standard liquid respectively ma/1..2mg/1..3mg/1..1mg/..5mg/1.: in: the concentration of the standard band (75) is recommended, the author can make the self-measurement according to the requirements of the instrument, the same element should be used for the instrument to work, 7.6 determination
7.6.1 Adjust the instrument
and adjust the instrument to the best value. 7.6.2 Draw the calibration curve
After the adjustment, draw the absorption value of the standard solution (7.5) at 422.7 μm according to the instrument manual, and use the level-value as the missing coordinate and the degree as the full coordinate to draw the calibration curve. 7.6.3 Determine the value of each element of the sample
Determine the liquid and read the absorption value of each element (1.4). At the same time, determine the empty bucket absorption value (A. If the liquid contains excess calcium, then the absorption value will be within the range of the working range. The result is calculated as
. The absorption value is A-A. The calcium concentration in the sample is calculated as the fraction of calcium in the sample, expressed as: Where:
m: mass fraction of calcium in the sample, %; p
oW,: X--
￥L/1 1/4—2503
Degree of absorption - absorption value is the absorption value of the measured liquid (A) minus the absorption value of the air (mR/L):
Starting volume, unit is liter (mL):
Test flow volume, unit is opening (mSample mass, unit is g ()
Dispensing machine. Unit is milliliter (L)
Water mass fraction of the sample.
The arithmetic mean of two parallel measurements is the measurement result, with an accuracy rate of 0,9%. The difference between the two parallel measurements should not exceed 5% of the arithmetic half mean of the measurement.
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