of the factors affecting overall precision. 5.10.) IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. that the garment selected is suitable for the intended use. of DuPont or others covering any material or its use. 2-Propanol (IPA) and isooctane, HPLC grade. Prepare a sufficient number of standards to generate calibration curves. P&CAM 331 in "NIOSH Manual of Analytical Methods", 2nd edition, U.S. Department of Health, Education, and Welfare, Public Health Services, Center for Disease Control, NIOSH, DHEW(NIOSH) Publication No. www.OSHA.gov. The sampler capacity is at least 8 times the Benzoyl peroxide can be used for the same purpose. are based performance of fabrics, not complete garments, under controlled conditions. Prepare stock standards by weighing 3 drops of MEK peroxide/DMP solution in 10-mL volumetric flasks and diluting to volume with 2-propanol. on the former procedure. This is the amount of analyte spiked on the sampling device which allows recovery of an amount equivalent to the detection limit of the analytical procedure. Vapors heavier than air. This amount produced MEK peroxide monomer and dimer peaks whose heights were about 5 times the height of the baseline noise. Figure 4.5.2. The recovery of MEK peroxide from samples used in a 16-day storage test remained above 92.2% when the samples were stored in a freezer. estimate (SEE) for a regression line plotted through the graphed storage data allows the inclusion of storage time as one The permeation characteristics of mixtures can deviate considerably The average of the reanalyzed samples relative to the average of the original analysis was 101.7%. ... in connection with this information. Submit at least one blank with each set of samples. 2-Butanone peroxide, Ethyl methyl ketone peroxide, MEKP, MEK peroxide, Methyl ethyl ketone hydroperoxide Colorless liquid with a characteristic odor. Figure 4.5.1. However, these colorimetric methods are prone to interference and Does not react with water or many common materials. Table 4.10.2.Stability of Desorbed Samples. A chromatogram of the detection limit of the analytical procedure is shown in Figure Used as a solvent, for making other chemicals, and for production of wax from petroleum. A draft copy of this procedure and six samples spiked with MEK peroxide were given to a chemist unassociated with this evaluation. Determine the best-fit lines. New unsilinized vials were used in this evaluation. Determine the concentrations of a sample, in micrograms of MEK peroxide monomer or dimer per milliliter, by comparing its detector responses to the calibration curves. The precision at the 95% confidence level for the refrigerated 16-day storage test is ±14.5%. and sampling rate: Ship samples at reduced temperature. Fifteen tubes were stored in a freezer (-25°C) and the other fifteen were stored in the dark at ambient temperature (about 22°C). www.OSHA.gov, Occupational Safety and Health Administration A chromatogram at target concentration under the alternate analytical conditions is shown in Figure The samples were analyzed after 7 days of storage at about -25°C. In this evaluation, the preparation of monomer and dimer for analytical standards was accomplished by modifying a procedure reported in the literature (Ref. The detection limit of the overall procedure is 4.51 µg per sample (0.30 mg/m3). (the time at which the permeation rate is equal to 0.1 µg/cm2/min) (Section The 95% confidence intervals are drawn about their respective regression lines in the storage graphs as shown in Figure assign cyclic dimer as the structure for MEK peroxide when it has been shown conclusively (Refs. Details. Depending on the experimental conditions, several different adducts of methyl ethyl ketone and hydrogen peroxide are known. This information is not intended as a license to operate and 3508 (Refs. The reliable quantitation limit and detection limits reported in the method are based upon optimization of the instrument for the smallest possible amount of the analyte. The test was conducted for a total * AP (TATP), CHP, DAP, DBP, DEP, HMTD, MEKP, TBHP. METHYL ETHYL KETONE is explosive in the form of vapor when exposed to heat, flame or sparks. The tables on this page are best viewed on a desktop, notebook, or tablet computer. 5.1.) 10% Acetic acid solution: Dilute 100 mL of glacial acetic acid to 1 L with 2-propanol. Evaluated method. Generally, chromatographic conditions can be altered to separate an interference. Let stand at room temperature overnight. Six vials containing 80 mg of XAD-4 were each liquid spiked with 4.51 µg of MEK peroxide. Methyl Ethyl Ketone Peroxide I went to the hardware store and, next to the impulse buys, there was some acetone, tolulene, and some methyl ethyl keytone. (Ref. No individual sample result deviated from its theoretical value by more than the precision reported in Section Methyl ethyl ketone peroxide (MEKP) is an organic peroxide, a high explosive similar to acetone peroxide. Butanone, also known as methyl ethyl ketone (MEK), is an organic compound with the formula CH 3 C(O)CH 2 CH 3.This colourless liquid ketone has a sharp, sweet odor reminiscent of acetone.It is … [Note: Explosive … Web site owner: Desorbed samples remain stable for at least 24 h when stored at room temperature. 2-Propanol, Optima, and isooctane, Optima, both from Fisher Scientific Co., were used in this evaluation. Determine the concentration of the dimer and monomer in the DMP solution by using the pure dimer and monomer synthesized in Section. Methyl ethyl ketone peroxide, 60% in DMP, from K & K Laboratories was used in this evaluation. Table 4.4.1.Instrument Response to MEK Peroxide Dimer, Table 4.4.2.Instrument Response to MEK Peroxide Monomer. No rapid reaction with water. Figure 3.1.3. National Oceanic and Atmospheric Administration. they do not differentiate the isomeric forms of MEK peroxide shown below. More info about absorbents, including situations to watch out for... National Oceanic and Atmospheric Administration, Ethyl Methyl Ketone Peroxide (also Methyl Ethyl Ketone Peroxide; concentration >60%), Methyl Ethyl Ketone Peroxide (concentration >60%). [3] Later studies found that a linear dimer is the most prevalent in the mixture of products typically obtained,[4] and this is the form that is typically quoted in the commercially available material from chemical supply companies.[5]. One subcutaneous sarcoma, three malignant lymphomas, and a pulmonary adenoma were noted in 34 of the 50 mice surviving exposure. The instrument response to MEK peroxide over the range of 0.5 to 2 times the target concentration is linear with a slope of 120700 area counts per µg/mL for the dimer and 113213 area counts per µg/mL for the monomer. Given orally, by inhalation, or by intraperitoneal injection, methyl ethyl ketone peroxide causes hyperemia of the lungs with petechial or gross hemorrhage in mice and rats. for a particular use and assume no liability in connection with any use of Skin: Wear appropriate personal protective clothing to prevent skin contact. Benzoyl peroxide can be used for the same purpose. These samples were stored in a refrigerator overnight and then desorbed and analyzed. For this application, MEKP is dissolved in dimethyl phthalate, cyclohexane peroxide, or diallyl phthalate to reduce sensitivity to shock. Prepare analytical standards by further diluting stock standards with 2-propanol. In rabbits, maximum nonirritating strengths were found to be 1.5 and 0.6% for the skin and eyes, respectively. METHYL ETHYL KETONE PEROXIDE is a strong oxidizing agent. A 25-cm × 6-mm Bakerbond cyanopropyl column was used in this evaluation. But the method suffers from a long run time as it requires dual injections and a column wash. An HPLC method using electrochemlcal detection has been reported, (Refs. XXV. Allow the flask to stand in the dark for 15 min. In many cases, Bracket the samples with analytical standards. Place the back section in a separate 4-mL vial. Table 4.10.1.Desorption Efficiency of MEK Peroxide. National Ocean Service, 4.1. (Section Calculate the purity of the monomer and dimer as follows. Liquid causes eye burn. (Section METHYL ETHYL KETONE PEROXIDE is a strong oxidizing agent. Standardize the 0.01 N sodium thiosulfate solution with a potassium dichromate primary standard. The only variable available to the user is to change the rate of this process using a catalyst, often Methyl-Ethyl-Ketone-Peroxide (MEKP), which is very toxic. Methyl ethyl ketone peroxide C 8 H 16 O 4. USA.gov. been tested at a concentration of greater than 95% unless otherwise Methyl ethyl ketone peroxide (MEKP) is an organic peroxide, a high explosive similar to acetone peroxide. Hydrogen peroxide and dimethyl phthalate are not interferences. Washington, DC 20210

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