This standard specifies the maximum permissible concentration and time-weighted average concentration of dibutyl phthalate in workplace air and its monitoring and inspection methods. This standard is applicable to all types of enterprises that produce and use dibutyl phthalate. GB 16243-1996 Hygienic standard for dibutyl phthalate in workplace air GB16243-1996 Standard download decompression password: www.bzxz.net

GB16243-1996
This standard is formulated for the first time based on toxicological experiments, on-site labor hygiene surveys and epidemiological survey data and reference to foreign occupational exposure limits. It is a hygienic standard used for workplace environmental monitoring and health supervision. This standard shall be implemented from September 1, 1996. Appendix A of this standard is the appendix to the standard.
This standard is proposed by the Ministry of Health of the People's Republic of China. The drafting unit of this standard: Hunan Provincial Institute of Labor Hygiene and Occupational Disease Prevention and Control. The main drafters of this standard: Xu Lianying and Chen Yuxu. This standard is interpreted by the Institute of Labor Hygiene and Occupational Diseases of the Chinese Academy of Preventive Medicine, which is the technical management unit entrusted by the Ministry of Health. 568
National Standard of the People's Republic of China
Health standard for dibutyl phthalate in the air of workplace1Scope
GB16243—1996Www.bzxZ.net
This standard specifies the maximum allowable concentration and time-weighted average concentration of dibutyl phthalate in the air of workplace and its monitoring and inspection methods.
This standard is applicable to all types of enterprises that produce and use dibutyl phthalate. Hygiene requirements
The maximum allowable concentration of dibutyl phthalate in the air of workplace is 2.5mg/m2, and the time-weighted average concentration is 1.0mg/m2. 3 Monitoring and inspection methods
The monitoring and inspection methods of this standard adopt gas chromatography, see Appendix A (Appendix to the standard). Approved by the State Technical Supervision Bureau on April 3, 1996 and implemented on September 1, 1996
A1 Principle
GB16243-1996
Appendix A
(Appendix to the standard)
Gas chromatography
A1.1 Dibutyl phthalate in the air is separated by 0V-101 column and detected by hydrogen flame ionization detector. Retention time is qualitative and peak area is quantitative.
A2 Instrument
A2.1 Sampling clip.
A2.2 Filter membrane: impregnated microporous filter membrane, pore size 0.8m. Take three culture III, add appropriate amount of carbon disulfide to each, immerse the filter membranes one by one in the solvent of the first culture III, take them out after 30 minutes and immerse them in the second culture blood. After three times, the blank value is almost zero. Take out the filter membrane and place it on quantitative filter paper. Volatilize it naturally in a clean environment and store it properly. A2.3 Vacuum, 0~5L/min.
A2.4 Stoppered graduated centrifuge tube, 10mL.
A2.5 Toothless stainless steel tweezers.
A2.6 Liquid fast mixer.
A2.7 Micro syringe, 10μL.
A2.8 Gas chromatograph, hydrogen flame ionization detector. Chromatographic column: 2m long, 4mm inner diameter stainless steel column, 0V-101: silanized 102 carrier = 5:100. Column temperature: 245℃.
Vaporization chamber temperature: 320℃.
Testing room temperature: 300℃.
Carrier gas (ammonia): 85mL/min.
A3 Reagents
A3.1 Dibutyl phthalate (DBP), chromatographic grade. A3.2 Carbon disulfide, no impurities after chromatographic inspection, otherwise it needs to be redistilled. A3.30V-101 Chromatographic stationary liquid.
A3.4 Silanized 102 white carrier, 60~80 mesh. A4 Sampling
A4.1 Take the filter membrane and clamp it in the sampling clamp, and extract 20L of air at a speed of 2L/min. A5 Analysis steps
A5.1 Control test: Bring the sampling clamp with the filter membrane to the sampling point, except not collecting air, and do the same operation as the sample as a blank control of the sample.
A5.2 Sample processing: Remove the filter membrane with tweezers, turn the filter membrane to the soil, and then roll it into a round tube slightly smaller than the inner diameter of the centrifuge tube, put it into a numbered centrifuge tube, and then add 1.00mL of carbon disulfide to the tube, cover the stopper tightly, shake several times, and store it in an ice box. A5.3 Standard curve drawing: Accurately weigh a 50ml volumetric bottle, add 0.2g of dibutyl phthalate, and then weigh it accurately. The difference between the two weighings is the mass of dibutyl phthalate. Add carbon disulfide to the scale and calculate the content of DBP in each milliliter of solution. When used, dilute it with carbon disulfide to a standard solution with a concentration of 0.025, 0.05, 0.10, 0.300.50, 0.70mg/mL. Use a microsyringe to inject 4μL of carbon disulfide, 1μL of air, and 5μL of standard solution. Repeat three times for each concentration and take the average of the peak area. Plot the DBP content against the peak area to draw a standard curve, with retention time as a qualitative indicator. A5.4 Determination: Place the centrifuge tube containing the sample and the blank filter membrane on a liquid rapid mixer and shake for 30 minutes (the shaking speed should be the same as that of the liquid ultrafiltration membrane, but lower than the tube plug). Then use tweezers to remove the filter membrane and use the remaining solution for determination. Under the same conditions as the standard curve determination, determine the sample and blank control, inject 5μL each, and subtract the blank control peak area value from the measured sample peak area value, and then check the DBP content (μg) from the standard curve.
A6 Calculation
A6.1 Convert the sample volume to the volume under standard conditions V. . V. =V× 273 +t
Where: V. —Sampling volume under standard conditions, L, Vsampling volume, L;
pressure——Atmospheric pressure at the sampling location, kPa; —Temperature at the sampling location, ℃.
A6.2 Calculate the concentration of DBP in the air according to formula (A2). X
DBP concentration in the air, mg/m;
Where: X-—
——Sample measurement value, mg,
C. Filter membrane blank value, mg,
V. -—-Sampling volume under standard conditions, m. A7 Explanation
(Al)
(A2)
A7.1 The detection limit of this method is 0.06μg (5μL of liquid sample). When the DBP concentration is 0.03, 0.5, and 1.0μg/μL, the coefficient of variation is 6.2%, 4.4%, and 3.1%, respectively.
A7.2 DBP is collected by filter membrane and analyzed by carbon disulfide. When the DBP concentration is 20-100μg, the analysis efficiency is 97%-99%. A7.3 The collected DBP samples are stored in ice cubes and the measurement must be completed within 24 hours. The sample recovery rate is 90%-115%. A7.4 The filter membrane elution efficiency must be determined for each measurement, and the measured value must be corrected when necessary. Xcompared = X/K
Where: Xcalibrated - the corrected DBP concentration in the workshop air, mg/m~; X--the measured DBP concentration in the workshop air, mg/m, elution efficiency, %, K-measured amount/added amount × 100%. K
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