GB/T 5009.127-2003 Determination of germanium in polyester resins for food packaging and their molded products

This standard specifies the determination of germanium by phenoxyfluorenone complex spectrophotometry after extraction with carbon tetrachloride. This standard is applicable to the determination of germanium in polyester resins for food packaging and their molded products. The detection limit of this method is 0.020μg/mL. GB/T 5009.127-2003 Determination of germanium in polyester resins for food packaging and their molded products GB/T5009.127-2003 Standard download decompression password: www.bzxz.net

HS 67.040
National Standard of the People's Republic of ChinabzxZ.net
GB/T 5009.127--2003
Replaces GB/T152331994
Determination of germanium in polyester resins and products for food packaging2003-08-11 Issued
Ministry of Health of the People's Republic of China
Standardization Administration of China
2004-01-01 Implementation
GR/T5009.127-2003
This standard replaces GB/1505-11 Determination of the content of polyester resin and its molded products for food packaging 1 Compared with GB/T1520-1934, this standard has major changes such as: the Chinese name of the standard has been revised. The Chinese name of the standard is "Determination of the content of polyester resin and its molded products for food packaging"; GB/T20001.4-2391<Standard writing rules: Section 4: Chemical analysis methods. The original standard has been revised.
This standard is proposed and managed by the Ministry of Health of the People's Republic of China. This standard was drafted by: Shanghai Food Safety Supervision Institute, Guangxi Industrial Zone Food Hygiene Supervision and Inspection Institute, Industrial Zone Biosafety Station
This standard was drafted by: Fang Yamin, Shen Wen, Lao Baofa, Xie Lin. The original standard was first issued in 1991, and this is the first revision. GB/T 5009.127-2003
Determination of germanium in ester resins and their molded products for food packaging This standard stipulates the determination of germanium by carbon monoxide extraction and benzoic acid combined spectrophotometry. This standard is applicable to the determination of germanium in ester resins and their molded products for good packaging. The main principle of this method is to boil the acetaldehyde solution of ester resin plastic in an acidic medium, extract carbon monoxide, heat it and react with this enzyme, and then spectrophotometrically determine it at 510m.
3 Test period
3. t Acid required
3.2 Glue.
Ethanol.
3.4 ​​Carbon dioxide
3.5=+1 hydrochloric acid solution, take 50ml, add water to dilute to 100ml-3.61+5 sulfuric acid solution: take nmT of water, slowly and carefully add 10% acid to the wall of the sugar cup. 3.74% volume fraction) Acid solution: weigh 1g, ether. Addition rate 10gml. 3.8g oxidation solution, 0g egg white, dilute with water to 1m, 3.98m/acid solution: weigh 400ml hydrochloric acid, add 60lml water, 3.100.4k/1. Benzophenone: weigh 31g of C. acetyl acrylate, add 75mL ethanol solution, add 5mL of sulfuric acid (above + 5), and stir to fully decompose, cool, add ethyl to the total volume of 1ml, 3.11% sodium hydroxide solution in a small beaker: add 2m sodium hydroxide solution, add 0.2% hydrogen peroxide and heat carefully, then add 31% concentrated sodium hydroxide, heat to a white state, and dry. After cooling, add 40℃/T to decompose sodium hydroxide solution. After the solution is dissolved, add 2 mL of concentrated vegetable acid to make it decomposed, transfer it to a 100 mL volumetric bottle, add water to the scale, this solution contains 0.5 img/mJ.
3.12 Correction: 0.0 mL is placed in a 100 mL volumetric bottle, add (1+) 3. Add water, this solution contains 25/mtL. Take a few more and dissolve them in 50 mL of water, add 1 mL of acid, and stir the water to the scale. This solution contains: ml
3.13 Hydrogen peroxide
4 Place in a photometer.
5 Analysis steps
5.1 Nuclear male dual energy production
Take the standard push and use 0.0.0.4.0.8,1.2,2.5,2.0ml (equivalent to 0.2.0,4,0.6.0.8.0,13.9g>. I have already had 50mEmnl/L acid-free liquid in the 6 parts of the bucket, add 10ml. Four boxes of chemical break, fully vibrate 1mi n. Static stratification. Take the card machine and set it to 10uit, add 1mL 0.4g/T benzene to the plug colorimetric snow, and then ethanol is marked with 198 degrees. After sufficient mixing, at a wavelength of 510nm, use a tube to calibrate the instrument zero point, use a 1-path colorimetric colorimetric to determine the optical base, and use the concentration as the vertical coordinate and the absorbance as the vertical coordinate to prepare a standard curve 5. 2 Analysis Steps
5.2.1 Pellet (material pellets)
Put about 4 ml of 4% acetic acid in a 250 mL reflux device. Add 91 mL of 4% acetic acid, condense it, and heat it in water for 3 h. Then, use a quick-change paper to fill it up, and rinse it with a little 4% acetic acid. After that, close the chamber and make it 1 mT. 5.2.2 Finished Product
Immerse the finished product in 4% process liquid at 2 ml/min. and incubate it at 60°C for 3 hours. 0min. The concentrated material is used as the sample for standby use.
Take 50mL of the sample of 5.2.1 or 5.2.2 and place it in 1CCmL evaporator. Heat and evaporate until it is close to 1 t. Dissolve it in 50mL of 1/1.2 molten acid. Wash the residue in the separatory bucket in batches. Then add 1cm2 of carbon dioxide. Absorb for 1min. Then, perform static stratification according to 5.1. Calculate the organic phase at 5m., and the absorbance width measured under 50min is used to calculate the corresponding content of tantalum from the standard curve. 5.4 Results Calculation
5.4.1 The molded product is calculated according to formula (1):
Where:
The content of tantalum in the molded product is in grams (mg/L). The content of tantalum in the sample collected during the determination is in grams (g). The volume of the sample collected at the time is in grams (g).;
The content of tantalum in the sample taken during the determination, in grams ();,
The volume of the sample taken during the determination, in liters (mL):
V.-..The volume of the sample taken during the determination, in milliliters (mL),6Precision test bench
The absolute value of the sum of the results of two independent determinations obtained under the rehydration strip shall not exceed 12% of the arithmetic mean. 13
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