Odor Threshold Concentration - SIPCOT Cuddalore

1 Odor Threshold ConcentrationFollowing are odour characteristics and odour thresholds for chemicals found inSIPCOT air in September 2004. AcetaldehydePungent, suffocating odor that is slightly fruity when in air= ppm (chemically pure) Odor low: mg/cu m; Odorhigh: mg/cu mA wide range of values has been reported: to 1000 ppm. Anacceptable, critiqued value is ppm (detection).(33) Another sourcereports the geometric value of all published values as ppm.(9,34)MethanolALCOHOLIC ODOR; PUNGENT ODOR WHEN CRUDE. Has a mild,characteristic alcohol odour, when pure. (1,31) Crude methanol mayhave a repulsive, pungent ALCOHOL DOES NOT HAVE SUITABLE WARNING ODORPROPERTIES EXCEPT @ HIGH CONCN. A LEVEL OF 2,000 PPM IS BARELYDETECTABLE BY ODOR. Low Threshold = mg/cu m; High Threshold =26840 mg/cu m; Irritating 22875 mg/cu values vary widely; ppm (geometric mean: 160 ppm)(detection); 53-8940 ppm (geometric mean: 690 ppm) (recognition) (33)TolueneSWEET, PUNGENT, BENZENE-LIKE ppm (8 mg/cu m).

2 Odor recognition level is reported as to 140 ug/cu m. Odorin air= 11 mol/cu cmThere is a wide variation in values: - 37 ppm (detection); - 69ppm (recognition).(18)1,1-DichloroethaneCHLO ROFORM-LIKE ODOR ; AROMATIC ETHEREAL ODORT hreshold conc.: 120 ppm (no specific isomer); 200 ppm (no specific isomer). m (odor low) 810 mg/cu m (odor high).NitrobenzeneODOR OF VOLATILE OIL ALMOND; Nitrobenzene has a pungent, shoe-polishsmell. Odour resembling that of bitter almonds or "shoe polish."Odor detection in air: mg/l vapor/, purity not specified. Odor recognition inair: ppm, chemically pure. Odor detection in air: ppm, chemically odor low, mg/cu m; odor high, mg/cu thresholds of mg/m3 ( ppm) (Amoore & Hautala,1983) and mg/m3 ( ppm) (Manufacturing ChemistsAssociation, 1968). The odour Threshold in water has been reported mg/litre (Amoore & Hautala, 1983) and mg/litre (US EPA,1980).

3 CarbonTetrachlorideSWEETISH, AROMATIC, MODERATELY STRONG ETHEREAL; SOMEWHATRESEMBLING THAT OF CHLOROFORMOdor recognition in air: ppm (chemically pure) In water: reduction ofamenities: odor Threshold 50 mg/lA wide range of values have been reported; to 706 ppm. The rangeof acceptable values is 140 to 584 ppm. Geometric mean air odourthreshold: 252 ppm (detection); 250 ppm (recognition).(49)CarbonDisulphidePUREST DISTILLATES HAVE SWEET, PLEASING, & ETHEREAL ODORUSUAL COMMERCIAL AND REAGENT GRADES ARE FOUL SMELLING ;When pure, carbon disulfide has sweetish aromatic odor similar to that of to PPM Detection, odor, in air; purity not specified: mg/l(gas).Recognition, odor, in air; purity not specified: ppm. Odor mg/m Odor High: mg/m Reported values vary widely and are not reliable; ppm (detection); ppm (recognition); to ppm (methods not specified).

4 (28) EpichlorohydrinODOR IS GENERALLY PERCEIVED AS A SLIGHTLY IRRITATINGCHLOROFORM-LIKE ODOR. ; Pungent, garlic; sweet; PERCEPTION STUDIES INDICATE THAT MEAN Threshold FORODOR RECOGNITION IS APPROX 10 PPM @ 25 PPM IT IS RECOGNIZED BYMAJORITY OF PERSONS. Human Odor Perception: non perception mg/cu m;perception mg/cu mThreshold 38-95 mg/m3airBenzeneAROMATIC ODORBENZENE HAS DISTINCTIVE SRP: AROMATIC ODOR HOWEVER /WARNINGPROPERTIES ARE INADEQUATE SINCE 100 PPM HAS IRRITATION RATINGOF 0 & ODOR INTENSITY BETWEEN 1 & 2. PPM In air: mg/cu m(characteristic odor), in water: ppm (detection); 97 ppm (recognition). Reported values range ppm.(31)MethyleneChlorideSweet, pleasant odor, like chloroform205-307 ppm 2 ppm (odor recognition in air; chemically pure sample) Odorthresholds: low= 540 mg/cu m; high= 2160 mg/cu m.

5 Odor index: 2100 @ 20 deg CA wide range of values are reported ( to 440 ppm), but detectionoccurs around 150 ppm and recognition around 230 AcetateMonomerSWEET SMELL IN SMALL QUANTITIES; PLEASANT FRUITY;CHARACTERISTIC ppm 50% recognition Threshold the conc. at which 50% of the odor panel definedthe odor as beingrepresentative of the odorant being studied/: ppm; 100%recognition Threshold : gas with a sharp, penetrating, intensely irritating odourReported values vary widely; to 53 ppm; geometric mean: 17 ppm(detection) (27)Formic AcidHas an intense, pungent, penetrating values vary widely and are not reliable; 13-340 ppm(detection) (21); 11-13 ppm (recognition) (21); 20 ppm (100%recognition (22)HydrofluoricAcidPungent, irritating, penetrating ppm ( mg/m3) (minimum perceptible Concentration ); ppm ( to 011 mg/m3) (3,21)MethylMercaptanRotten cabbage-1 ppb Odour Threshold ca.)

6 2 ppb. Acetaldehyde has a pungent suffocating odor, but at dilute concentrations it has afruity and pleasant odor. The odor Threshold of acetaldehyde is ppm ( ).