Page:NIOSH Manual of Analytical Methods - 5013.pdf/5

 DYES, BENZIDINE-, o-TOLIDINE-, o-DIANISIDINE-: METHOD 5013, Issue 2, dated 15 August 1994 Page 5 of 5 TABLE 1. BENZIDINE- AND BENZIDINE-CONGENER-BASED DYES.

Color Index Name

C.I. Number

Molecular Formula

M.W.

Synonyms [4]

Range a µg per sampler µg/mb3 r

BENZIDINE-BASED: C.I. Direct Red 28

22120

C32H22N6S2O 6Na 2

696.67

Congo Red; CAS #573-58-0 RTECS QK1400000

27.3-273

546.5 -46

C.I. Direct Blue 6

22610

C32H20N6S4O 14Na 4

932

Amidine Blue 2B; CAS #2602-46-2 RTECS QJ6400000

15.0-300

30.6 -00

C.I. Direct Brown 95

30145

C31H18N6O 9Na 2Cu

759

Chrome Leather Brown; CAS #16071-86-6 RTECS GL7375000

24.3-242

486.4 -85

C.I. Direct Black 38

30235

C34H25N9S2O 7Na 2

781

Amidine Black GA; CAS #1937-37-7 RTECS QJ6160000

12.5-250

250.5 -00

o-TOLIDINE-BASED: C.I. Direct Red 2

23500

C34H26N6S2O 6Na 2

724.74

Benzopurpurine 4B; CAS #992-59-6 RTECS QK1765000

16.7-334

334.6 -68

24140

C34H24N4S2O 10Na 2

758.69

Direct Azurine G; Benzo Azurine G; CAS #2429-71-2

10.2-204

204.4 -08

o-DIANISIDINE-BASED: C.I. Direct Blue 8 a b

Air concentrations calculated from analytical results with an air volume of 500 L assumed. The letters "A" and "B" refer to the reduction buffer solutions described in the REAGENTS section, items 11.a and b.

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