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Home-made Detection Device for a Mixture of Ethanol and Acetone

View Article: PubMed Central

ABSTRACT

A device for the detection and determination of ethanol and acetone was constructed, consisting of a packed column, a chamber with a sensor head, 2 dc power supplies, a multimeter and a computer. A commercially available TGS 822 detector head (Figaro Company Limited) was used as the sensor head. The TGS 822 detector consists of a SnO2 thick film deposited on the surface of an alumina ceramic tube which contains a heating element inside. An analytical column was coupled with the setup to enhance the separation of ethanol and acetone before they reached the sensor head. Optimum system conditions for detection of ethanol and acetone were achieved by varying the flow rate of the carrier gas, voltage of the heating coil (VH), voltage of the circuit sensor (VC), load resistance of the circuit sensor (RL) and the injector port temperature. The flow of the carrier gas was 15 mL/min; the circuit conditions were VH = 5.5 V, VC = 20 V, RL = 68 kΩ; and the injection port temperature was 150°C. Under these conditions the retention times (tR) for ethanol and acetone were 1.95 and 0.57 minutes, respectively. Calibration graphs were obtained for ethanol and acetone over the concentration range of 10 to 160 mg/L. The limits of detection (LOD) for ethanol and acetone were 9.25 mg/L and 4.41 mg/L respectively.

No MeSH data available.


Chromatograms of mixed standard solution show the effect of the flow rate; a) 15 mL/min, b) 26 mL/min, c) 42 mL/min, d) 80 mL/min, and e) 112 mL/min
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f2-sensors-07-00202: Chromatograms of mixed standard solution show the effect of the flow rate; a) 15 mL/min, b) 26 mL/min, c) 42 mL/min, d) 80 mL/min, and e) 112 mL/min

Mentions: The flow rate of the carrier gas was adjusted to 15, 26, 42, 80 and 112 mL/min. Figure 2 shows the chromatograms of the mixed standard solution with different carrier gas flow rates. A carrier gas flow rate of 15 mL/min was found to be the optimum one, since as shown in Figure 2a, it shows a larger peak area of ethanol and acetone. If the carrier gas has a high flow rate the responses of ethanol and acetone will give smaller peak areas because the ethanol and acetone vapors have a shorter reaction time at the sensor head. Viceversa, if the flow rate of the carrier gas is low the ethanol and acetone vapors have a longer reaction time at the sensor head and give larger peak areas.


Home-made Detection Device for a Mixture of Ethanol and Acetone
Chromatograms of mixed standard solution show the effect of the flow rate; a) 15 mL/min, b) 26 mL/min, c) 42 mL/min, d) 80 mL/min, and e) 112 mL/min
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3756701&req=5

f2-sensors-07-00202: Chromatograms of mixed standard solution show the effect of the flow rate; a) 15 mL/min, b) 26 mL/min, c) 42 mL/min, d) 80 mL/min, and e) 112 mL/min
Mentions: The flow rate of the carrier gas was adjusted to 15, 26, 42, 80 and 112 mL/min. Figure 2 shows the chromatograms of the mixed standard solution with different carrier gas flow rates. A carrier gas flow rate of 15 mL/min was found to be the optimum one, since as shown in Figure 2a, it shows a larger peak area of ethanol and acetone. If the carrier gas has a high flow rate the responses of ethanol and acetone will give smaller peak areas because the ethanol and acetone vapors have a shorter reaction time at the sensor head. Viceversa, if the flow rate of the carrier gas is low the ethanol and acetone vapors have a longer reaction time at the sensor head and give larger peak areas.

View Article: PubMed Central

ABSTRACT

A device for the detection and determination of ethanol and acetone was constructed, consisting of a packed column, a chamber with a sensor head, 2 dc power supplies, a multimeter and a computer. A commercially available TGS 822 detector head (Figaro Company Limited) was used as the sensor head. The TGS 822 detector consists of a SnO2 thick film deposited on the surface of an alumina ceramic tube which contains a heating element inside. An analytical column was coupled with the setup to enhance the separation of ethanol and acetone before they reached the sensor head. Optimum system conditions for detection of ethanol and acetone were achieved by varying the flow rate of the carrier gas, voltage of the heating coil (VH), voltage of the circuit sensor (VC), load resistance of the circuit sensor (RL) and the injector port temperature. The flow of the carrier gas was 15 mL/min; the circuit conditions were VH = 5.5 V, VC = 20 V, RL = 68 kΩ; and the injection port temperature was 150°C. Under these conditions the retention times (tR) for ethanol and acetone were 1.95 and 0.57 minutes, respectively. Calibration graphs were obtained for ethanol and acetone over the concentration range of 10 to 160 mg/L. The limits of detection (LOD) for ethanol and acetone were 9.25 mg/L and 4.41 mg/L respectively.

No MeSH data available.