NAME: Benzidine Based Dyes
IMIS: B128
CAS: 92-87-5
Exposure Limits
NIOSH REL: Lowest Feasible Concentration Carcinogen
Health Factors
IARC: Group 2A, probably carcinogenic to humans
Monitoring
PRIMARY SAMPLING/ANALYTICAL METHOD (SLC1):
MEDIA:
Polytetrafluoroethylene Filter, 5 micron
MAX V: 500 Liters MAX F: 3.0 L/min
ANL 1: High Performance Liquid Chromatography; HPLC/UL52.
REF: 1 (NIOSH 5013)
CLASS: Partially Validated
NOTE: This method does not differentiate between different dyes. Protect samples from heat and light.
COND: Column: C18 Mobile Phase: 60:40 Methanol: Phosphate Buffer Detector Wavelength: Detection Limit: Direct Blue 6 - 0.94 ug/m3 . Direct Brown 95 - 7.7 ug/m3 . Direct Black 38 - 15 ug/m3
WIPE:
Yes, with Glass Fiber Filter.
BULK METHOD:
For any dye analysis, a bulk sample of the dye must be sent to the SLCAL. Limit the amount of bulk submitted to one gram or approx. one mL. If possible include Material Safety Data Sheet and color index number of dye.
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