BONDED PHASE
| PHASE |
TEMP °C |
EQUIVALENTS |
| Methyl polysiloxane |
50-325 |
Most frequently used phase in GC. Low selectivity, separates
compounds according to boiling points. Excellent thermal stability |
SE-30, OV-1, OV-101, DB-1, SPB-1, BP-1, HP-1, ULTRA-1, RTx-1, AT-1,
CPSil-5 |
| Methyl 5% Phenyl Polysilozane |
50-325 |
Similar to methyl polysiloxane but slightly more selective due to
phenyl content. Excellent thermal stability. |
SE-54, OV-23, DB-5, SPB-5, BP-5, HP-5, ULTRA 2, RTx-5, CPSil-8
|
| Methyl 50% Phenyl Polysiloxane |
40-325 |
Added selectivity due to higher phenyl content. Usually retains
similar compounds longer than methyl silicone. Provides efficient
separations of PAHS and biomedical samples such as drugs, sugars and
steroids. Good thermal stability. |
OV-17, DB-17, SPB-7, BP-10, HP-17, RTx-17, AT-50, |
| 50% Trifluoropropyl 50% Methyl polysiloxane |
40-300 |
Selectivity for compounds with lone pair electrons or carbonyl
groups. Retains oxygenated compounds in the order ether, hydroxy, ester
and keto Widely used as a confirmatory phase for chlorinated
pesticides.Also suitable for PCB’s, phenols and nitroaromatics. Good
thermal stability. |
DB-210, RTx-200, HP-210 |
| 6% Cyanopropylphenyl 94% Methylpolysiloxane |
30-320 |
An additional choice for a general purpose phase with nominal
selectivity for polarizable and polar compounds. More of a boiling
point phase than 007-1701; and exhibits less retention of polyaromatic
compounds than 007-17.Good thermal stability. |
DB-1301, RTx-1301, HP-1301 |
| Methyl 7% Cyanopropyl 7% Phenyl Polysiloxane |
280 |
Unique selectivity of cyanopropyl and phenyl groups provide
efficient separations of deriviitized sugars and many environmental
samples. Not truly a polar phase. Good thermal stability |
DB-1701, CPSil-19, RTx-1701, AT-1701 |
| Methyl 25% Cyanopropyl 25% Phenyl Polyciloxane |
40-240 |
Polar phase which provides efficient separations of polar molecules
such as fatty acids and alditol acetate derivatives of sugars. Fair
thermal stability |
DB-255, HP-255, CPSil-43, RTx-225, AT-255 |
| Polyethylene Glycol |
20-260 |
Carbowax 20M is a polyethylene glycol phase which demonstrates
unique selectivity hydrogen bonding-type molecules. Particularly useful
for the analysis of complex oxygenated samples but is susceptible to
oxygen degradation. Not recommended for the analysis of mixtures
containing silylating reagents |
DB-Wax, Supelsowax 10, Super-ox, CPWax-52, Stabilwax, BP-20,
HP-20M, AT-Wax |
| Free Fatty Acid Phase |
20-260 |
The product of Carbowax 20M and 2- Nitroterephthalic acid.
Particularly useful for volatile fatty acids and fatty acid methyl
esters (FAMEs). Good thermal stability but susceptible to oxygen
degradation. Not recommended for the analyses of mixtures containing
salylating reagents |
OV-351, DB-Wax, SP-1000, AT-1000, HP-FFAP, AT-1000 |
| Methyl Phenyl Cyanopropyl Polysiloxane |
20-260 |
A series of specially synthesized stationary phases of mid-polarity
with unique selectivity due to cyanopropyl and phenyl groups
.Configured for difficult environmental analyses. Good thermal
stability |
DB-624, VOCAL, DB-608, RTx-502, RTx-Volatile, AT-624, SPB-608
|
| Cyanopropyl Polysiloxane |
40-280 |
A highly polar stationary phase.Ideal for fatty acid methyl esters
(FAME) analysis, dioxin, and furan separations and other separations
requiring unique selectivity and polarity. Good thermal stability |
SP-2340, SP-2330, DB-23, OV-275, AT-SILAR |
