Page:NIOSH Manual of Analytical Methods - 5020.pdf/1

 DI(2-ETHYLHEXYL) PHTHALATE See DIBUTYL PHTHALATE (Method 5020) for Procedure

C6H4(COOCH2CH(C2H5)(CH2)3CH3)2

MW: 390.56

METHOD: 5020, Issue 2

CAS: 117-81-7

CLASS B

OSHA : 5 mg/m 3 NIOSH: not established ACGIH: 5 mg/m 3; STEL 10 mg/m 3

RTECS: TI0350000 Issue 1: 15 May 1985 Issue 2: 15 August 1994

PROPERTIES: oily liquids; Table 1

SYNONYMS: dibutyl phthalate: n-butyl phthalate; phthalic acid dibutyl ester; DBP; di(2-ethylhexyl) phthalate (1) : bis(2-ethylhexyl) phthalate; dioctyl phthalate; DOP; (1) Listed incorrectly as di-sec, octyl phthalate in 29CFR 1910.23. SAMPLING SAMPLER:

FILTER (0.8 µm cellulose ester membrane)

MEASUREMENT TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

di(2-ethylhexyl)phthalate or dibutyl phthalate

DESORPTION:

2 mL CS 2; 30 min in ultrasonic bath

FLOW RATE: 1 to 3 L/min VOL-MIN: -MAX:

10 L @ 5 mg/m 3 200 L

SHIPMENT:

routine

INJECTION VOLUME: 5 µL

SAMPLE STABILITY:

BLANKS:

DBP - ≥6 days @ 25 °C [1] DOP - not known

10% ( ≥2) of samples

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

300 °C 300 °C 200 to 250 °C

CARRIER GAS:

He, 30 mL/min

COLUMN:

2 m x 3 mm OD stainless steel, 5% OV-101 on 100/120 mesh Chromosorb W-HP

CALIBRATION:

solutions of analytes in CS 2 with internal standard

RANGE:

0.05 to 0.5 mg per sample

ACCURACY RANGE STUDIED: 2 to 10 mg/m 3 [1,2] (30-L samples) ACCURACY: BIAS:

not significant [1,2]

OVERALL PRECISION (sr): 0.057 [1,2]

ESTIMATED LOD: 0.01 mg per sample PRECISION (sr):

0.05 @ 0.07 to 0.3 mg per sample [1,2]

APPLICABILITY: The working range is 1 to 20 mg/m 3 for a 50-L air sample. Phthalates are widely used as plasticizers for many resins and elastomers.

INTERFERENCES: None identified. An alternate GC column is 10 m x 0.25 mm ID, 0.25-µm DB-1, fused silica capillary.

OTHER METHODS: This method combines and replaces Methods S33 [3] and S40 [4].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/92