Document b5JeOJ978QeGaDn60nqEnw3Rk

3M Organic Vapor Monitor # 3500 Analysis Guide ANOTHER STEP TOWARDS BETTER OCCUPATIONAL HEALTH AND SAFETY R35AG(611 .)H Occupational Health and Safety Products Division/3M 220-7W.3M Center St. Paul, Minnesota 55144 3M 010087 Litho in U.S.A. 3M Organic Vapor Monitor Analysis Guide USE OF THE ANALYSIS GUIDE TABLES: The Analysis Guide is designed for the customer involved in the analysis of the 3M #3500 Organic Vapor Monitor by the gas chromatograph. The following tables summarize the 3M monitor sampling rate, capacity, recovery coefficient and calculation constants. The analysis guide provides the necessary information to calculate the time-weighted-average concentration in parts per million (ppm) or milligrams per cubic meter (mg/m3). A. Monitor Sample Information Sampling Rate The (*) compounds in the Sampling Guide tables have been subjected to an extensive amount of laboratory work to verify the sampling rate. The sampling rates given for the remaining compounds in this table were determined from empirical relationships as outlined in a publication on Sampling Rate Validation. All sampling rates have an accuracy of 5%. The sampling rates are tabulated as either cubic centimeters/minute or micrograms/ppm-hour. Capacity The capacity of the monitor for each individual compound is a function of molecular structure, vapor pressure, environmental conditions, etc. The capacity is stated in terms of weight (milligrams). For a single contaminant, if the analyst finds the weight collected by the monitor is greater than the defined capacity, then the validity of the sample should be questioned. When sampling multiple contaminants, the combined weights of the contaminants collected should not exceed the defined value for the single contaminant with tie lowest capacity. Recovery Coefficients (Desorption Efficiency) The collected sample is removed from the activated carbon wafer for analysis by desorption with carbon disulfide (CS2) or other suitable solvents. In order for the laboratory analyst to determine accurately the amount of contaminant collected by the adsorbent it is necessary to know the efficiency of the desorption process. The recovery coefficient or desorption efficiency is determined by adding a known weight of contaminant onto the adsorbent and measuring the weight of contaminant in the desorbing solvent. The recovery coefficient is calculated by dividing the recovered weight by the known weight It is recommended that each analytical laboratory determine recovery coefficients according to the procedure outlined by the 3M laboratory contained in the Analysis Guide as "Recommended Procedure for Determination of Recovery Coefficients." Recovery coefficients determined by the 3M laboratory are tabulated in the following tables. B. Procedure to Calculate Contaminant Concentrations The time-weighted-average concentration of the environment sampled can be calculated by knowing the length of the sampling period, the contaminant weight determined by gas chromatography, the recovery coefficient and the calculation constant either A or B. The calculation constant A is used to calculate the concentration when expressed in units of milligrams per cubic meter (mg/m3) and constant B when expressed in units of parts per million (ppm). The calculation constant A and B have been determined for every contaminant in the Analysis Guide by the following expressions: A= 1000 Sampling Rate B = 1000 X (24.45) (Sampling Rate) x (Molecular Weight) 3M 01008S i The contaminant concentration can be calculated with the following Information: Sampling Information Contaminant 7 Length of Sampling Period (min.) t / Contaminant Information from Tables in Analysis Guide Calculation Constant A or B Analytical Results Contaminant weight recovered W (Micrograms) Recovery Coefficient (r) The time-weighted-average concentration in milligrams per cubic meter of the contaminant in the environment sampled can be calculated from the following expression: C(mg/m3) = W (micrograms) xA rxt (minutes) The time-weighted-average concentration in parts per million (ppm) of the contaminant can be calculated from the following expression: C(ppm) = W (micrograms) xB rxt (minutes) The above expressions calculate the time-weighted-average concentrations at a sampling temperature of 25^ (298K) and pressure of 760 mm. When sampling at other environmental conditions, the above expressions need to be corrected only for variations in temperature. The above expressions can be multiplied by the following temperatures correction factors (CFT) for samples collected at temperatures other than 25C (77F). Sampling (C) 44 37 31 25 19 13 7 2 -3 -8 Temperature (F) 111 99 88 77 66 55 45 36 27 18 Temperature Correction Factor (CFt) .97 .98 .99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 From the above table, every 10-11 above or below 77F requires a one percent correction to the calculated time-weighted-average concentration. If the temperature correction is desired, the time weighted average concentration can be calculated by the following expression: C(mg/m3) = C(ppm) = W (micrograms) r x t (minutes) W (micrograms) rxt (minutes) xAxCFt x B x CFT 3M 0100S9 2 Example Calculation Contaminant Length of Sampling Period (t) Temperature (T) Calculation Constant A or B Contaminant Weight Recovered (W) Recovery Coefficient(r) Benzene 420 minute* 75T 28.2 8.83 27.2 micrograms 1.02 Using Calculation Constant A: C(mg/m3)= --------- --------------(1.02) (420) x28.2 C = 1.79 mg/m3 Using Calculation Constant B: C (ppm) = --------- ---------------- x 8.83 (1.02) (4.20) C = .56 ppm 3M 010090 3 Acetone* Acetonitrile Acrylonitrile Ally! Alcohol Ally! Chloride n-Amyl Acetate* s-Amyt Acetate n-Amyl Alcohol* 1-Amyl Alcohol* s-Amyl Alcohol Benzene* Benzyl Chloride Bromoform Butadiene n-Butyl Acetate s-Butyl Acetate t-Butyl Acetate Butyl Acrylate Butyl Alcohol* s-Butyl Alcohol t-Butyt Alcohol Butyl Cellosotve* (2-Butoxyethanol) Butyl Glycidyl Ether (BQE) p-tert-Butyltoluene* Camphor Carbon Disulfide Carbon Tetrachloride* Cellosotve* (2-Ethoxyethanol) Cellosolve Acetate* (2-Ethoxyethyl Acetate) Chlorobenzene* o-Chlorostyrene o-Chlorotoluene Chlorobromomethane* Chloroform 1 -Chloro-1 -nitropropane Chloroprene (2-Cnloro-l ,3-butadiene) Cumene* Cyclohexane* Cydohexanol* Cyclohexanone* Cydohexene* Diacetone Alcohol* o-Dichlorobenzene* p-Dichlorobenzene* 1,1 Dichloroethane 1,2 Dichloroethylene* 1,1 Dichloro-1 -nitroethane Dichloroethyl Ether +Methylene Chloride as the solvent ANALYSIS GUIDE Sampling Rate (cc/mht) 40.1 * .9 48.2 43.8 40.4 35.1 26.0 .5 27.2 31.2 .4 32.3 .4 32.3 35.5 .6 27.2 29.3 42.8 31.6 26.6 29.4 28.7 34.3 .7 34.8 35.2 28.2 .6 27.0 20.7 .4 21.4 42.8 30.2 A 32.4 .9 26.6 .4 29.3 .6 26.0 27.3 34.4 .9 33.5 30.4 32.2 24.5 .9 32.4 .7 29.5 .3 28.9 .3 32.3 .4 28.2 .4 27.8 .6 27.8 .6 33.2 35.2 .5 28.5 26.1 Capacity (mg) 3 14 11 20 1 >25 >25 >25 >25 >25 13 >25 >25 .4 25 >25 19 >25 >25 19 13 >25 >25 >25 >25 1 14 >25 >25 >25 >25 >25 10 7 >25 5 >25 22 >25 >25 22 >25 >25 >25 4 1 >25 >25 Recovery Coefficient .87 -- -- -- -- 1.08 -- 1.00+ .99 + .99 + 1.02 1.05 1.05 -- 1.04 1.07 1.05 -- .98+ .97+ -- .86 -- 1.10 -- -- 1.05 .78 1.03 1.00 -- 1.00 .98 -- _ .96 1.07 1.00+ .97 1.02 1.04 + .95 .95 -- .99 -- -- CttouMkm Constant (mg/m*) B (PPm) 24.9 10.51 20.8 12.37 22.8 10.53 24.75 28.5 10.43 9.05 38.6 7.26 36.8 6.91 32.1 8.91 31.0 8.63 31.0 8.60 28.2 8.83 36.8 7.08 34.1 3.30 23.4 10.53 31.7 6.67 35.0 7.37 34.0 7.17 34.8 6.66 29.2 9.63 . 28.7 9.44 28.4 9.39 35.5 37.0 48.3 46.7 23.4 33.1 7.35 6.97 7.98 7.52 7.52 5.26 30.9 8.39 37,6 6.96 34.1 7.38 38.5 6.77 36.6 7.05 29.1 5.51 29.9 6.13 32.9 6.49 31.1 8.53 40.8 8.32 30.9 8.98 32.7 8.48 34.6 8.63 31.0 9.23 35.5 7.47 36.0 5.98 36.0 5.98 30.1 7.44 28.4 7.16 35.1 5.96 38.3 6.55 3M 010091 4 Mrh' Dllsobutyl Ketone* Dimethyl Formamide p-Dioxane Dipropytene Glycol Methyl Ether Enflurane (2-ChtofO-1,1,2 trtfluoroethyl ditluoromethyl ether) Epichlorohydrin (1 -Chtoro-2,3-epoxy-propane) Ethyl Acetate* Ethyl Acrylate Ethyl Alcohol Ethyl Benzene Ethyl Bromide* Ethyl Butyl Ketone (3-Heptanone) Ethyl Ether Ethyl Formate Ethylene Chlorohydrin (2-Chloroethanol) Ethylene Dibromide* (1,2-Dibromomethane) Ethylene Dichloride* (1,2-Dichloroethane) Furfural Furfuryl Alcohol Glyddol (2,3-Epoxy-l -propanol) Halothane (2-Bromo-2-chloro-1,1,1 trifluoroethane) Heptane* Hexachloroethane Hexane* s-Hexyl Acetate Isoamyl Acetate Isoamyl Alcohol* Isobutyt Acetate* Isobutyl Alcohol* laophorone* Isopropyl Acetate Isopropyl Alcohol Isopropyl Ether Isopropyl Gtyddyt Ether Mesityl Oxide* Mesitylene* (Tnmethyl Benzene) Methyl Acetate* Methyl Acrylate Methylal (Dlmethyoxymethane) Methyl Amyl Ketone (2-Heptanone) Methyl Bromide Methyl Butyl Ketone* (2-Hexanone) Methyl Isobutyl Ketone* (Hexanone) Methyl Cellosolve* (2-Methoxyethanol) + Methylene Chloride a the solvent ANALYSIS GUIDE Sampling Rate / (cc/mln) 24.8 .8 ' 32.4 / 34.5 25.3 Capacity (") >25 >25 >25 >25 Coefficient 1.07 -- -- Calculation Conatant A (mg/m1) 40.7 B (PPTM> 7.00 30.9 10.34 29.0 8.05 39.5 6.53 28.3 29.6 34.5 .6 32.2 51.2 27.3 36.4 .3 28.0 36.8 38.8 33.9 29.6 .4 33.2 .7 34.3 32.6 37.1 4-- >25 .95 10 1.01 19 12 -- >25 -- 1 1.03 >25 _ .4 -- 1 >25 -- >25 1.04 18 1.02 >25 -- >25 -- >25 -- 35.3 4.68 33.8 8.88 29.0 8.05 31.1 7.59 19.5 10.38 36.6 8.45 27.5 6.16 35.7 7.66 27.2 8.98 25.8 8.52 29.5 8.90 33.8 4.39 30.1 7.44 32.8 8.35 30.7 7.65 27.0 8.91 30.2 28.9 .7 26.7 32.0 .7 28.1 27.2 32.3 .4 31.0 .3 35.9 .7 21.7 .7 31.7 39.4 312 29.1 312 1.2 26.3 .7 37.0 .6 35.8 37.9 27.9 46.5 29.7 .7 30.0 .4 36.3 .4 4-- >25 1.08 >25 -- 18 1.05 >25 -- >25 -- >25 1.03+ >25 -- >25 1.02+ >25 1.03+ 15 1.05+ 17 -- 10 -- >25 -- >25 .99 >25 1.06 2 1.00 11 1-- >25 -- .5 -- >25 1.00 >25 1.06 >25 .75 33.1 34.6 37.5 31.3 35.6 36.8 31.0 32.3 27.9 46.1 31.5 25.4 33.0 34.4 32.1 38.0 27.0 27.9 26.4 35.8 21.5 33.7 33.3 27.5 5.96 8.46 3.86 6.68 6.04 8.64 8.60 6.80 9.20 8.16 7.56 10.34 7.91 7.24 8.00 7.75 8.93 7,94 8.49 7.69 5.53 8.23 8.15 8.86 5 3H 010092 f Methyl Cellosolve Acetate* (Ethylene Glycol Methyl Ether Acetate) Methyl Chloroform* Methyl Cyclohexane* Methyl Cydohexanol Methyl Ethyl Ketone* (2-Butanone) Methyl Formate 5-Methyl-3-heptanone (Ethyl Amyl Ketone) Methyl Iodide Methyl Isobutyl Carbtnol (Methyl Amyl Alcohol) Methyl Isoamyl Ketone Methyl Methacrylate Alpha Methyl Styrene* Methylene Chloride* (Dlchloromethane) Naphtha (VM&P)* Naphthalene Nonane* Octane* Pentane* 2-Pentanone* (Methyl Propyl Ketone) Perchloroethylene* Phenyl Ether Phenyl Glycfdyi Ether n-Propyl Acetate* n-Propyl Alcohol* Propylene Dlchloride* (1,2 Dlchloropropane) Propylene Glycol Monomethyl Ether n-Propyl Nitrate Stoddard Solvent Styrene* 1,1,2,2-Tetrachloroethane 1,1,1 ^-Tetrachloro-2,2-dlfluoroethane 1,1,2,2-Tetrachloro-l ,2-dlfluoroethane Tetrahydrofuran Toluene* 1,1,2-Trichtoroethane* Trichloroethylene* 1,1,2-Trichtoro-l ^2-trMuoroethane 1,2,3-Trichloropropane Vinyl Acetate Vinyl Bromide Vinyl Chloride* Vinylidene Chloride Vinyl Toluene Xylene* +MMftytam CNorida asths solvent ANALYSIS GUIDE / Sampling Rate (cc/mln) 29.0 .5 30.9 .3 28.9 .4 28.8 36.3 .9 45.0 26.4 36.7 29.2 28.0 31.8 25.0 .5 37.9 .3 33.2 .7 24.6 24.6 .6 26.6 .6 35.3 .9 33.0 .5 28.3 .5 24.1 20.8 30.1 .5 39.7 .7 30.6 .4 32.4 33.3 24.3 26.8 .8 28.4 29.7 28.2 37.2 31.4 .6 29.7 .6 31.1 3. 31.4 27.4 35.8 41.0 40.8 .5 38.4 26.8 27.3 .5 Capacity (mg) Coefficient >25 1.00 12 1.03 >25 1.05 >25 12 1.00 .2 -- >25 .2 __ -- >25 _ >25 -- 24 >25 1.01 2 .90 20 1.04 >25 -- >25 1.09 >25 1.08 7 1.02 23 1.03 >25 1.05 >25 -- >25 -- 21 25 .93 + 25 1.04 >25 >25 >25 -- >25 1.08 >25 .89 5-- 5-- 8 25 1.05 >25 1.02 20 1.00 .5 >25 -- 7 1.02 .3 .04 1.02 .5 >25 -- >25 1.07 Calculation Constant (rng/m*) B (ppm) 34.5 7.14 32.4 5.95 34.6 8.63 34.7 7.45 27.5 22.2 37.9 27.3 34.2 35.7 31.5 40.0 26.9 30.1 40.7 40.7 37.6 28.3 30.3 35.3 41.5 48.1 33.3 25.2 32.7 32.3 30.0 41.2 37.3 35.2 33.9 35.5 26.8 31.8 33.7 32.2 31.9 36.5 27.9 24.4 24.4 25.9 37.3 36.6 9.35 9.06 7.24 4.69 8.21 7.66 7.69 8.29 7.59 7.36 7.76 . 9.04 8.06 9.62 8.62 5.20 5.97 7.84 7.96 10.26 7.07 7.58 8.25 6.99 8.77 5.12 4.06 4.25 9.13 8.46 6.19 6.00 4.16 8.07 7.94 5.57 9.56 6.53 7.73 8.45 3M 010093 6