| [ IN-12 ] CRESOL RED CAS-No. 1733-12-6 |
Chemical Formula |
C21H18O 5S |
Molecular Weight |
382.44 |
Transition Range |
pH6.5–pH8.5 yellow to purple |
Maximum absorbtion wave length,nm
λ1 (pH6.5)
λ2 (pH8.5) |
432–436
571–574
|
Absorption rate of quality,L/cm.g
α1 ( λ1 pH6.5 ,dry basis)
α2 ( λ2 pH8.5 ,dry basis) |
49–67
100–132
|
Solution clarity ( Ethanol ) |
Pass |
| Loss On Drying |
≤ 3.0% |
Sulfated ash |
≤ 0.2% |
| [ IN-13 ] CRESOL RED SODIUM SALT CAS-No.62625-29-0 |
Chemical Formula |
C21H17O5SNa |
Molecular Weight |
404.41 |
transition range… |
pH6.5–pH8.5 yellow-purple |
Solution clarity(water) |
Conforms |
Sulfated ash |
18–20% |
Loss on drying |
≤ 3% |
| [IN-14 ] m - CRESOL PURPLE CAS-No. 2303-01-7 |
Chemical Formula |
C21H18O5S |
Molecular Weight |
382.44 |
1 st Transition Range |
pH1.2–pH2.8 pink to yellow |
2 nd Transition Range |
pH7.4–pH9.0 brownish yellow to violet |
Maximum absorbtion wave length, nm
λ1 (pH1.2)
λ2 (pH2.8)
λ3 (pH7.4)
λ4 (pH9.0) |
526–529
431–437
431–437
576–580
|
Absorption rate of quality, L/cm.g:
α1 ( λ1, pH1.2, dry basis )
α2 ( λ2, pH2.8, dry basis )
α3 ( λ3 , pH7.4, dry basis )
α4 ( λ4 , pH9.0, dry basis ) |
80–94
40–46
39–45
75–86
|
Solution Clarity (Ethanol) |
Pass |
| Loss on drying |
≤ 1% |
[ IN-15 ] o -CRESOLPHTHALEIN COMPLEXON CAS-No. 2411-89-4 |
Chemical Formula |
C32H32N2O12 |
Molecular Weight |
636.62 |
Absorption λ Max |
575 nm |
Content ( Spectrophotometric ) |
≥ 80% |
Sensitive test |
Pass |
Solution clarity ( Water ) |
Pass |
Sulfated ash |
≤ 1% |
Dissociate toluene phenolphthalein |
Pass |
Impurity of organic matter |
Pass |
