YC/T 175-2003 Determination of magnesium in tobacco and tobacco products - Atomic absorption method

This standard specifies the determination method of magnesium in tobacco and tobacco products. This standard applies to the determination of magnesium in tobacco and tobacco products. YC/T 175-2003 Determination of magnesium in tobacco and tobacco products Atomic absorption method YC/T175-2003 Standard download decompression password: www.bzxz.net

ICS 65.165
Registration number: 12157--2003
Tobacco Industry Standard of the People's Republic of China
YC/T 175---2003
Tobacco and tobacco products
Determination of magnesium
Atomic absorption method
Tobaccn and tobacco products--Determination of magnesiumAlomicahsorptionspectrophotometry2003-06-25Promulgated
State Tobacco Monopoly Administration
2003-10-01Implementation
YC/T175—2003
This standard is approved by the State Tobacco Monopoly Administration. Foreword
This standard is issued by the National Tobacco Standardization Technical Committee (T): China Grassland Research Institute. The main contributors of this standard: Zhang Huai, Xiao Xiezhong, Zhan You, Zhong Shi, Li, Scope
Determination of magnesium
Tobacco and tobacco products
Atomic absorption method
This standard specifies the determination method of magnesium in tobacco and tobacco products. This standard is applicable to the determination of magnesium in tobacco and tobacco products. 2 Normative references
YC/T 175—2003Www.bzxZ.net
The following clauses are incorporated by reference in this standard. For all referenced documents, all subsequent amendments (including new revisions) are not applicable to this standard. However, all research projects based on this standard are encouraged to use the latest version. For all documents with a later date, the latest version is the most applicable to this standard. G13/T5906.1 General collection of raw materials for smoke oil YC5 burning batch 5-1992e1S018711981YC3 Preparation and water content of the product (E/311996.e1VIS2589921
3 Principle
Product release: The product is prepared by the absorption spectrophotometer and the absorption of magnesium is determined within an appropriate concentration range.
4 Reagents
The reagents specified in this standard are all deionized or equivalent. 1 Water is deionized water or water of equal purity. 4. 1. Acid (g. ml). || tt || 4.2 Hydrochloric acid solution: H1) -6 m]. - Pipette hydrochloric acid (4.130 ml) and mix with 5 ml water. 4.3 Hydrochloric acid solution: H1: 1: 1 mol: [1. Transfer hydrochloric acid; 4.) R: I. Dilute to 1.4.4.3. Prepare standard stock solution: 10 ml of magnesium standard stock solution (4.4) with water (Mg) 1: mR/1.7. Accurately pipette 10 ml of magnesium standard stock solution (4.4) into a 1 m volume flask, mix, and absorb F ml. into a ml clinical flask. 5 Instruments and equipment
5.1 Source absorption spectrophotometer:
Slow-motion polar lamp. Can be used with the original absorption spectrophotometer (5.1). The fast-acting system is called the original absorption spectrophotometer 5.1. 5.3
Porcelain H average
Thermostatic thermometer
5.7 Analyzer, single
Volumetric flask,.....2ml.1ol.
Pipette....
FC/T175—2003
6 Sampling
6.1 Tobacco leaves
Press/. Take cigarettes as laboratory samples: 6.2 Cigarettes
According to H/T=.【Take cigarettes as laboratory samples, 7 Analysis steps
7.1 Laboratory sample preparation
Prepare analytical samples according to T31.
7.2 Number of determinations
Each sample shall be determined in parallel for no less than two times
7.3 Determination of moisture content
Determine the moisture content of the sample according to YC/T31. 7.4 Preparation of test solution
7.4.1 Accurately weigh (0.50)0-.0)5)g of sample in (E.4), half open, carbonize the smoke on the electric hot plate, and then place in a muffle furnace (5.) preheated to Y: for 1h until there are no carbon particles. If the carbonization is not complete, take the sample and add a few drops of ethanol to moisten it, dry it at low temperature and then re-carbonize it. 7.4.2 After cooling, take out the decomposed sample and use a small amount of water to moisten the ash content. Add a small amount of hydrochloric acid solution (4.3) drop by drop in batches. Be careful to prevent the loss of ash content. After the reaction has eased, add more hydrochloric acid to fully dissolve the paint: add a total of about 1 ml of hydrochloric acid solution (1.2). 7.4.3 Move the oil to an electric stove (such as asbestos mesh) and heat it to boiling. Transfer the heat to a 25 mL container with hot water. Set it as the test wave. Perform a blank test at the same time. 7.5 Preparation of series of standard solutions
Magnesium dioxide is used as standard solution (4.5) 1.000ml, 2.000ml, 3.000ml, 3.000ml, 3.000ml, 5.000g/mL, respectively. The concentrations of this series of working standard solutions are 0.1mg/L, 0.2mg1..1mg/L, 0.4mg/L, 1.0.5mg/L, respectively.
Note: The concentration range of series standard solution 7. is for reference only. The author can adjust the sensitivity of the instrument according to the operating habits. The concentration of each element should be within the linear range of the instrument. 7.6 Determination
7.6.1 Optimization of instrument conditions
Refer to the instrument instructions and adjust the instrument to the most reliable conditions according to the characteristics of the element. 7.6.2 Draw the calibration curve
After the instrument has been adjusted for half of the time, determine the absorption values ​​of the series of standard solutions (7.) at 2, n according to the instrument instructions. Use the absorption value as the ordinate and the value as the horizontal axis to draw the concentration absorption value curve. 7.6.3 Determine the sample
Determine the determination solution of each element, read the absorption value of each element to be measured (A), and simultaneously determine the blank absorption value (A). If the concentration of the element to be measured is too high, continue to dilute it to within the concentration range of the curve used for the calculation. 8 Result calculation
On the concentration absorption value curve, the absorption value is 44 for the calcium concentration. The amount fraction of pancreatic in the sample is calculated according to formula (1), and the value is expressed as: pV.V x 10 *
mV.(wu..)
Wherein:
a——the mass fraction of magnesium in the sample;
YC/T175—2003
P——the concentration corresponding to the absorption value of the test solution (A) minus the blank absorption value (A), in units of mH/L:
The initial volume is liters (:
V is the volume of the test solution. The unit is milliliters (m):n——the mass of the test group (g)
V——the volume of the subtracted liquid, in units of milliliter (ml); 1——the mass fraction of water in the test group:
The arithmetic mean of two parallel determinations is the determination result, accurate to 0,CO1 light. The absolute value of the difference
two parallel determinations shall not be greater than 5% of the arithmetic mean of the two determination values.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.