BROMINE
6011
See CHLORINE, Method 6011, for procedure
Br2
MW: 159.82
METHOD: 6011, Issue 2
CAS: 7726-95-6
RTECS: EF9100000
EVALUATION: FULL
OSHA : 0.1 ppm NIOSH: 0.1 ppm; STEL 0.3 ppm ACGIH: 0.1 ppm; STEL 0.3 ppm (1 ppm = 6.53 mg/m 3)
PROPERTIES:
Issue 1: 15 May 1989 Issue 2: 15 August 1994
liquid; d 3.119 g/mL @ 20 °C; BP 58.78 °C; VP 23.3 kPa (175 mm Hg) @ 20 °C vapor density (air=1) 5.5
SYNONYMS: None.
SAMPLING
MEASUREMENT
SAMPLER:
PREFILTER + FILTER (PTFE, 0.5-µm + silver membrane, 25-mm, 0.45-µm)
TECHNIQUE:
ION CHROMATOGRAPHY, CONDUCTIVITY
FLOW RATE:
0.3 to 1 L/min
ANALYTE:
bromide ion (Br -)
VOL-MIN: -MAX:
8 L @ 0.1 ppm 360 L
EXTRACTION:
3 mL 6 mM Na 2S20 3, 10 min
INJECTION VOLUME:
SHIPMENT:
routine, protect from light
COLUMN:
SAMPLE STABILITY:
≥30 days at 25 °C [1]
BLANKS:
2 to 10 field blanks per set
50 µL
Dionex HPIC-AG4A guard, HPIC-AS4A separator, MFC-1 precolumn, AMMS anion suppressor
DETECTOR SETTING:
10 µS full scale
ELUENT:
0.25 mM NaHCO 3/4 mM Na 2CO 3/0.78 mM p-cyanophenol, 2 mL/min
CALIBRATION:
standard solutions of Br - in deionized water
RANGE:
5 to 150 µg Br - per sample [1]
ESTIMATED LOD:
1.6 µg Br - per sample [1]
PRECISION (Sr):
0.045 @ 5 to 100 µg per sample [1]
ACCURACY RANGE STUDIED:
0.07 to 1.42 mg/m 3 (72-L samples)
BIAS:
- 1.2%
ˆ ): 0.069 [1] OVERALL PRECISION (S rT ACCURACY:
± 13.6%
APPLICABILITY: The working ranges for Br 2 and Cl 2 are 0.008 to 0.4 ppm (0.06 to 2.6 mg/m 3) and 0.007 to 0.5 ppm (0.02 to 1.5 mg/m 3) respectively for a 90-L air sample. The method has sufficient sensitivity for STEL samples.
INTERFERENCES: Hydrogen sulfide gives a negative interference. HCl gives a positive interference upon a maximum of 15 µg per sample. HBr gives a positive interference as it is sampled continuously [1].
OTHER METHODS: P&CAM 209 (colorimetric) [2], OSHA Methods ID-101 [3] and ID-108 [4] are alternative methods.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
