EPA air monitoring chain of custody, Jan 2003

NYC 9/11 Public Portal Document

ASBESTOS and OTHER FIBERS by PCM 7400

Various MW: Various CAS: Various RTECS: Various

METHOD: 7400, Issue 2 EVALUATION: FULL Issue 1: Rev. 3 on IS May 1989 Issue 2: 15 August 1994

OSHA : 0.1 asbestos fiber (> 5 pm long)/cc; PROPERTIES: solid, fibrous, crystalline, anisotropic 1 f/cc/30 min excursion: carcinogen MSHA: 2 asbestos fibers/cc NIOSH: 0.1 f/cc (fibers > 5 pm long)/400 L; carcinogen ACGIH: 0.2 crocidolite; 0.5 amosite; 2 chrysotile and other asbestos, fibers/cc; carcinogen

SYNONYMS [CAS #]: actinolite [77536-66-4] orferroactinolite [15669-07-51; amosite [12172-73-5]; anthophyllite [77536-67-5]; chrysotile [12001-29-5]; serpentine [18786-24-8]; crocidolite [12001-28-4]; tremolite [77536-68-6]; amphibole asbestos [1332-21-4]; refractory ceramic fibers [142844-00-6]; fibrous glass.

SAMPLING MEASUREMENT

SAMPLER: FILTER TECHNIQUE: LIGHT MICROSCOPY, PHASE (0.45- to 1.2-pm cellulose ester CONTRAST membrane, 25-mm: conductive cowl on cassette) ANALYTE: fibers (manual count)

FLOW RATE*: 0.5 to 16 Umin SAMPLE PREPARATION: acetone - collapse/triacetin - immersion VOL-MIN*: 400 L @ 0.1 fiber/cc method [2] -MAX*: (step 4, sampling) •Adjust to give 100 to 1300 fiber/mm COUNTING RULES: described in previous version of this SHIPMENT: routine (pack to reduce shock) method as "A" rules [1,3]

SAMPLE EQUIPMENT: 1. positive phase-contrast microscope STABILITY: stable 2. Walton-Beckett graticule (100-pm field of view) Type G-22 BLANKS: 2 to 10 field blanks per set 3. phase-shift test slide (HSE/NPL)

ACCURACY CALIBRATION: HSE/NPL test slide

RANGE STUDIED: 80 to 100 fibers counted RANGE: 100 to 1300 fibers/mm’ filter area

BIAS: see EVALUATION OF METHOD ESTIMATED LOD: 7 fibers/mm’ filter area OVERALL PRECISION (§,,.): 0.115 to 0.13 [1] PRECISION (S3: 0.10 to 0.12 [1]; see EVALUATION ACCURACY: see EVALUATION OF METHOD OF METHOD

APPLICABILITY: The quantitative working range is 0.04 to 0.5 fiber/cc for a 1000-L air sample. The LOD depends on sample volume and quantity of interfering dust, and is <0.01 fiber/cc for atmospheres free of interferences. The method gives a n index of airborne fibers. It is primarily used for estimating asbestos concentrations, though PCM does not differentiate betwe en asbestos and other fibers. Use this method in conjunction with electron microscopy (e.g., Method 7402) for assistance in identifi cation of fibers. Fibers < ca. 0.25 pm diameter will not be detected by this method [4]. This method may be used for other materia Is such as fibrous glass by using alternate counting rules (see Appendix C).

INTERFERENCES: If the method is used to detect a specific type of fiber, any other airborne fiber may interfere since all particles meeting the counting criteria are counted. Chain-like particles may appear fibrous. High levels of non-fibrous dust part Ides may obscure fibers in the field of view and increase the detection limit.

OTHER METHODS: This revision replaces Method 7400, Revision #3 (dated 5/15/89).

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition. 8/15/94

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