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Chemical Exposure Monitoring

Laboratory users may use various potentially hazardous materials daily. Proper laboratory health and safety measures and engineering controls should be applied for the sake of the safe use of such materials. In some cases, verification of the effectiveness of work practices and engineering controls in limiting hazardous chemicals exposure is required.

Exposure monitoring is the determination of the airborne concentration of a hazardous material in the work environment. Exposure monitoring data is compared to existing international standards exposure guidelines and is often used to make recommendations concerning engineering controls, work practices, and PPE.

Occupational exposure limits for several chemicals that have been determined by Turkish Government is shown in Table 8.1. For further information please see the Regulations on Health and Safety Measures for Working with Chemicals (References, 8.19).

Table 8.1 Occupational exposure limits for several chemicals have been determined by Turkish Government
EINECSCASSample nameLimiting valuesSign (3)
TWA (4) (8 hours)STEL (5)(15 min.)
mg/m3 (6)ppm (7)mg/m3ppm
200-467-260-29-7Diethylether308100616200-
200-662-267-64-1Acetone1210500---
200-663-867-66-3Chloroform102--Skin
200-756-371-55-61,1,1-Trichloroethane5551001110200-
200-834-775-04-7Ethylamine9,45---
200-863-575-34-31,1-Dichloroethane412100--Skin
200-870-375-44-5Phosgene0,080,020,40,1-
200-871-975-45-6Chlorodifluoromethane36001000---
201-159-078-93-3Butanone600200900300-
201-176-379-09-4Propionic acid31106220-
202-422-295-47-6o-Xylene22150442100Skin
202-425-995-50-11,2-Dichlorobenzene1222030650Skin
202-436-995-63-61,2,4-Trimethylbenzene10020---
202-704-598-82-8Cumene1002025050Skin
202-705-098-83-92-Phenylpropene24650492100-
202-849-4100-41-4Ethylbenzene442100884200Skin
203-313-2105-60-2e-Kaprolactam (dust or its vapor)10-40--
203-388-1106-35-4Heptan-3-one9520---
203-396-5106-42-3p-Xylene22150442100Skin
203-400-5106-46-71,4-Dichlorobenzene1222030650-
203-470-7107-18-6Allyl alcohol4,8212,15Skin
203-473-3107-21-1Ethylene glycol522010440Skin
203-539-1107-98-21-Methoxypropanol-2375100568150Skin
203-550-1108-10-14-Methylpentane-2-on832020850-
203-576-3108-38-3m-Xylene22150442100Skin
203-603-9108-65-62-Methoxy-1-methylethylacetate27550550100Skin
203-604-4108-67-8Mesitylene (Trimethylbenzenes)10020---
203-631-1108-94-1Cyclohexanone40,81081,620Skin
203-632-7108-95-2Phenol7,82--Skin
203-726-8109-99-9Tetrahydrofurane15050300100Skin
203-737-8110-12-35-Methylhexan-2-one9520---
203-767-1110-43-0Heptan-2-one23850475100Skin
203-808-3110-85-0Piperazine0,1-0,3--
203-905-0111-76-22-Butoxyethanol982024650Skin
203-933-3112-07-22-Butoxyethyl acetate1332033350Skin
204-065-8115-10-6Dimethylether19201000---
204-428-0120-82-11,2,4-Trichlorobenzene15,1237,85Skin
204-469-4121-44-8Triethylamine8,4212,63Skin
204-662-3123-92-2Isopentylacetate27050540100-
204-697-4124-40-3Dimethylamine3,829,45-
204-826-4127-19-5N,N-Dimethylacetamide36107220Skin
205-480-7141-32-2n-Butylacrylate1125310-
205-563-8142-82-5n-Heptane2085500---
208-394-8526-73-81,2,3-Trimethylbenzene10020---
208-793-7541-85-55-Methylheptan-3-one531010720-
210-946-8626-38-01-Methylbutylacetate27050540100-
211-047-3628-63-7Pentylacetate27050540100-
 620-11-13-Pentylacetate27050540100-
 625-16-1Amylacetate, tert27050540100-
215-535-71330-20-7Xylene, (mixture isomers, pure)22150442100Skin
222-995-23689-24-5Sulfotep0,1---Skin
231-634-87664-39-3Hydrogen fluoride1,51,82,53-
231-131-37440-22-4Silver (Metallic)0,1----
231-595-77647-01-0Hydrogen chloride851510-
231-633-27664-38-2Orthophosphoric acid1-2--
231-635-37664-41-7Ammonia (anhydrous)14203650-
231-954-87782-41-4Fluoride1,5813,162-
231-978-97783-07-5Dihydrogen selenide0,070,020,170,05-
233-113-010035-10-6Hydrogen bromide--6,72-
247-852-126628-22-8Sodium azide0,1-0,3-Skin
252-104-234590-94-8(2-Methoxymethyletoxy)-propanol30850--Skin
  Fluorides, inorganic2,5----
( 1 ) EINECS: European inventory of chemicals.( 4 ) TWA: Weighted average that was measured or calculated in 8 hours reference
( 2 ) CAS: Chemical abstracts service number.( 5 ) STEL: Unless stated otherwise, exposure maximum that should not be exceeded in 15 minutes interval.
( 3 ) Skin: “indicates that the chemical can be significantly absorbed by skin( 6 ) mg/m3: Amount of substance in milligrams present in 1 mof air at 760 mmHg (101,3 KPa in 20 0C).
( 7 ) ppm: Amount of substance in milliliters present in 1 m3 of air (ml/m3). 
*Adopted from Turkish Ministry of Labour and Social Security, Regulations on Occupational Health and Safety Measures of Working with Chemicals (Reference 8,19).
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