HG 3027-1988 Determination of plasticizer content in organic glass UV spectrometry HG3027-1988 standard download decompression password: www.bzxz.net

UDC 678.5:543.062
National Standard of the People's Republic of China
GB9346-88
Adjusted to: HG/ 3027-1P88
Determination of plasticizer content in polymethylmethacryiateUltraviolet spectrometry methodPublished on 1988-06-14
Published by the State Bureau of Standards
Implemented on 1989-02-01
National Standard of the People's Republic of China
Determination of plasticizer content in polymethylmethacrylate-Ultraviolet spectrometry method
1 Subject content and scope of application
UDC 678.5: 543
GB 9346.. 88
This standard specifies the ultraviolet spectroscopic determination method for the plasticizer dibutyl phthalate (BP) and dioctyl phthalate (DP) in cast organic glass (polymethyl methacrylate). This standard is applicable to the determination of the plasticizer DBP or DOP content in cast elastic transparent organic glass. 2 Principle
Dibutyl phthalate or dioctyl phthalate in chloroform solution has a characteristic absorption peak at a wavelength of 275nm under the action of ultraviolet light, which conforms to the L. Ramhert Beer law within a certain concentration range. The absorbance of chloroform in the glass sample is measured at 275nm, and the content of dibutyl phthalate or dioctyl phthalate is calculated by the working curve method.
3 Reagents
3.1 DBP: maximum concentration
3.2 DOP: content greater than 90%,
3.3 Methyl chloride, analytical grade,
3.4 ​​Standard solution:
3.4.1 Weigh 0.05-0.07g of 1H1 (3.1) to the accuracy of 0.0001g, place in a 50ml volumetric flask, dilute to the mark with methyl chloride (3.3), mix, and the result is DBP standard solution. 3.4.2 Weigh 0.05-0.07g of DOP (3.2) to the accuracy of 0.0001g, place in a 50ml volumetric flask, dilute to the mark with methyl chloride (3.3), and the result is DOP standard solution. 4. Instruments
UV spectrophotometer.
5 The sample
should be particles or powders randomly taken from the organic glass. 6 Determination steps
6.1 Drawing line
Pipette 0.5.1.0, 1.5.2.0, 3.0ml of D13P standard solution (3.4.1), and dilute it to 25ml volume. Dilute it with trichloroethylene (3.3) without scale, mix it, and calculate the IBP concentration (mg/1) of each dilution. Take trifluoromethane used to prepare the standard solution (GB9346-88 approved by the Ministry of Chemical Industry of the People's Republic of China on May 13, 1988 and implemented on February 1, 1989) as a reference, and record the absorbance of each solution at a wavelength of 275nm. Draw a DBPT curve with the concentration of DB1 as the horizontal axis and the absorbance as the vertical axis. www.bzxz.net
Take 0.5, 1.0, 1.5, 2.0, 3.0 ml of DOP standard solution (3.4.2), repeat the above operation, and draw a DOP curve. 6.2 Determination
6.2.1 Weigh 0.03~0.08% of the sample, and make it accurate to 0.0001g, and place it in a 25ml volumetric flask, add 15~20ml of chloroform (3.3), and after the sample is completely dissolved, dilute it to the scale with chloroform and mix it. 6.2.2 Transfer part of the solution to be tested (6.2.1) into a 10mm quartz colorimetric glass, using the chloroform dissolved in the sample as the ratio, and measure its absorbance at a wavelength of 275m on a UV spectrophotometer under the conditions corresponding to the curve drawn above, and find the corresponding DHP or DOP concentration (mg/!) from the working curve.
7 Calculation of results
Calculate the percentage of plasticizer DBP or DOP as follows: c +× 10-4
Where: c——plasticizer DBP or DOP concentration found from the working curve, mg/L: one sample solution volume, ml:
sample volume, sample.
8 Allowable difference
8.1 For samples with a DBP content of 2% to 13%, the allowable difference between two repeated measurements should not be greater than 0.14%. 8.2 For samples with a DBP content of 2% to 13%, the allowable difference between the values ​​measured once in each laboratory should not be greater than 0.33%. 8.3 For samples with a DOP content of 0.5% to 5.0%, the allowable difference between two repeated measurements and the allowable difference between the values ​​measured once in each laboratory should not be greater than the values ​​listed in the following table. Plasticizer DOP content
0.50 ~ 2.00
2.00 -3.50
-3.50 ~ 5.00
The allowable difference between two repeated determinations
The allowable difference between the single determination values ​​in each experiment is 0.19
Note: The precision data were determined by eight laboratories from June 1986 to March 1987 in accordance with GB4471 "Determination of Repeatability and Reproducibility of Laboratory Tests for Chemical Products - Test Methods for Precision", and the tests were conducted on 5 levels of DBP and DOP. 9 Test report
The test report should include the following contents:
, indicate that it is in accordance with this national standard:
b, material name, specification, batch number, source or manufacturerc. The average of two determinations,
d, tester
e test date.
Additional Notes:
GB 9346--8B
This standard was drafted by the National Technical Committee for Plastic Standardization. This standard was drafted by Hai Shanhu Chemical Factory. The main drafters of this standard were Zhang Nianhong and Wu Yi. National Standard of the People's Republic of China Determination of plasticizer content in organic glass Ultraviolet spectrum GB 9346-88 Published by China Standard Press (Beijing Fuwai Sanlihe) Published by China Standard Press Beijing Printing Factory Guangji Xinhuazhe Store Beijing Distribution Office Sold by Xinhua Bookstores in various places Copyright exclusive Reproduction prohibited Format 880×12301/16 Printing sheet 1/2 Number 5 000 First edition in February 1389 Second edition in February 1989 Number of copies 1-2000 2 55: 155066-1 Price 0.40 106-36 88-988 89
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.