Cromatografía De Gases

GAS CHROMATOGRAPHY
In this task I want to determine different compounds and find out value of concentration of my sample using gas chromatography. For this, I will inject volumes of Methane, C5-C9, 2-Methyl-2-propanol, Cyclohexane, propyl acetate, Methylbenzene (Toluene), 2-Methyl-2-ethylbutyrane and 1,4-Dimethylbenzene.
I will determine the composition of Benzin (qualitative)using ret. time, and the concentration of Toluene in my sample (Quantitative), using Standard addition method with areas of peaks.

Parameters of Chromatograph:
* l=25 metres
* Diameter=0,31 mm r=0,155 mm=1,55·10-4 m
* Df=0,52 μm
* SF=5% Phenyl, 95% Methyl Polysiloxane
Tables and qualitative determination
1. Methane: It’s a gas, so I will inject 20 μl.

| Ret.time |
1 | 2,303 |
2 | 2,297 |
3 | 2,293 |
4 | 2,297 |
5 | 2,293 |
Average | 2,297 |

Volumetric flow rate=π·r2·Ltm=π·2,4·10-8·25137,82=1,37·10-8 m/sec
Linear flow rate=Ltm=25137,82=0,181 m/sec

2. C5-C9: Liquid, inject 0,5 μl

  | Ret. time C5 | Ret. time C6 | Ret. time C7 | Ret. time C8 | Ret. time C9 |
1 | 2,507 | 2,740 | 3,213 | 4,170 | 6,083 |
2 |2,493 | 2,727 | 3,200 | 4,153 | 6,057 |
3 | 2,503 | 2,740 | 3,210 | 4,163 | 6,063 |
4 | 2,500 | 2,737 | 3,207 | 4,160 | 6,063 |
5 | 2,490 | 2,727 | 3,197 | 4,147 | 6,050 |
Average | 2,499 | 2,734 | 3,205 | 4,159 | 6,063 |
3. Organic compounds

| 1 | 2 | Average |
2-Methyl-2-Propanol | 2,527 | 2,520 | 2,524 |
Cyclohexane | 3,037 | 3,027 | 3,032 |
Propyl acetate |3,253 | 3,243 | 3,248 |
Methylbenzene (Toluene) | 3,890 | 3,890 | 3,890 |
2-methyl-2-ethylbutyrane | 4,770 | 4,767 | 4,769 |
1,4-Dimethylbenzene | 5,613 | 5,563 | 5,588 |

4. Benzin: I have 11 different peaks.

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
1 | 2,473 | 2,547 | 2,617 | 2,660 | 2,697 | 2,853 | 2,983 | 3,037 | 3,107 | 3,173 | 3,447 |
2 | 2,477 | 2,543 |2,613 | 2,657 | 2,697 | 2,853 | 2,983 | 3,037 | 3,107 | 3,173 | 3,447 |
3 | 2,477 | 2,537 | 2,607 | 2,650 | 2,690 | 2,847 | 2,977 | 3,030 | 3,100 | 3,164 | 3,440 |
Average | 2,476 | 2,542 | 2,612 | 2,656 | 2,695 | 2,851 | 2,981 | 3,035 | 3,105 | 3,170 | 3,445 |

* Peak 1: 2,476≃2,499C5
* Peak 2: 2,542≃2,524 2-Methyl-2-Propanol
* Peak 3: 2,612≈? ?
* Peak 4: 2,656≈??
* Peak 5: 2,695≈2,734 C6
* Peak 6: 2,851≈??
* Peak 7: 2,981≈? ?
* Peak 8: 3,035≈≃3,032Cyclohexane
* Peak 9: 3,105≈? ?
* Peak 10: 3,170≈3,205 C7
* Peak 11: 3,445≈?...