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

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

C6H4(COOCH2CH(C2H5)(CH2)3CH3)2 METHOD: 5020, Issue 2

MW: 390.56

CAS: 117-81-7

RTECS: TI0350000

EVALUATION: PARTIAL

OSHA : 5 mg/m 3; STEL 10 mg/m 3 NIOSH: 5 mg/m 3; STEL 10 mg/m3 (carcinogen) ACGIH: 5 mg/m 3; STEL 10 mg/m 3 (suspect carcinogen)

PROPERTIES:

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

oily liquid; d 0.983 g/mL @ 20 °C; MP -50 °C; BP 386 °C; VP < 1 Pa (0.01 mm Hg) @ 20 °C

SYNONYMS: bis(2-ethylhexyl) phthalate; dioctyl phthalate; DOP; DEHP (listed incorrectly as di-sec-octyl phthalate in 29 CFR 1910.23) SAMPLING

MEASUREMENT

SAMPLER:

FILTER (0.8 µm cellulose ester membrane)

FLOW RATE:

1 to 3 L/min

VOL-MIN: -MAX:

6 L @ 5 mg/m 3 200 L

SHIPMENT:

routine

SAMPLE STABILITY:

unknown

TEMPERATURE-INJECTION: -DETECTOR: -COLUMN:

BLANKS:

2 to 10 field blanks per set

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:

30 to 500 µg per sample

ACCURACY RANGE STUDIED:

2 to 11 mg/m 3 [2] (32-L samples)

BIAS:

7.56%

TECHNIQUE:

GAS CHROMATOGRAPHY, FID

ANALYTE:

di(2-ethylhexyl)phthalate

DESORPTION:

2 mL CS 2; 30 min in ultrasonic bath

INJECTION VOLUME: 5 µL 300 °C 300 °C 200 to 250 °C

ESTIMATED LOD: 10 µg per sample

ˆ rT): 0.057 [1,2] OVERALL PRECISION (S ACCURACY:

± 19.2%

PRECISION (Sr):

0.05 @ 0.07 to 0.3 mg per sample [2]

APPLICABILITY: The working range is 1 to 20 mg/m 3 for a 30-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 revises method S40 [4].

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