[ IN-28 ] 4 –C ( 4 -NITROPHENYLAZO)- 1 -NAPHTHOL CAS-No. 5290-62-0 |
Chemical Formula |
C16H11N3O3 |
Molecular Weight |
293.28 |
Content(as N) |
14.0–14.6% |
Sensitivity to magnesium |
Conforms |
Solution Clarity ( Dilute alkali ) |
Conforms |
Sulfated ash |
≤ 1% |
| [IN-29] NITRAZINE YELLOW C.I. 14890 |
Chemical Formula |
C16H8N4Na2O11S2 |
Molecular Weight |
542.37 |
Transition Range |
ph6.0–pH7.2 yellow to blue |
Solution Clarity (water) |
Conforms |
Sulfated ash |
24.2-28.2% |
| [ IN-30 ] PHENOL RED CAS-No.143-74-8 |
Chemical Formula |
C19H14O5S |
Molecular Weight |
354.38 |
1 st Transition Range |
pH1.2 – pH3.0 brownish orange to yellow |
2 nd Transition Range |
pH6.5 – pH8.0 brownish yellow to red violet |
Maximum absorbtion wave length, nm:
λ1 (pH1.2)
λ2 (pH3.0)
λ3 (pH6.5)
λ4 (pH8.0) |
503–506
430–435
430–435
557–560
|
Absorption rate of quality, L/cm.g:
α1( λ1,pH1.2 dry bases)
α2( λ2,pH3.0 dry bases)
α3( λ3,pH6.5 dry bases)
α4( λ4,pH8.0 dry bases) |
110–123
60–68
62–72
120–135
|
Solution Clarity (alkali) |
Conforms |
Loss on drying |
≤ 1.0% |
Sulfated ash |
≤ 0.2% |
[ IN-31 ] PHENOL RED SODIUM SALT CAS-No.34487-61-1 |
| Chemical Formula |
C19H13NaO5S |
Molecular Weight |
376.36 |
1 st transition range |
pH1.2–pH3.0 brownish orange-yellow |
2 nd transition range |
pH6.5–pH8.0 brownish yellow-red violet |
Appearance of solution |
Conforms |
Sulfated ash |
17-21% |
| Loss on drying |
≤ 8% |
| [ IN-32 ] PHENOLPHTHALEIN CAS-No.77-09-8 |
Chemical Formula |
C20H14O4 |
Molecular Weight |
318.33 |
Transition Range |
pH8.0– pH10.0 colorless to red-violet |
Absorption rate of quality, L/cm.g |
68.0–75.0 |
Solution Clarity (Ethanol) |
Pass test |
Sulfated ash |
≤ 0.05% |
Loss on drying |
≤ 1.0% |
