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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.


Relationship between peak area and voltage of the heating coil
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f3-sensors-07-00202: Relationship between peak area and voltage of the heating coil

Mentions: The best operating temperature of the TGS 822 sensor was determined by applying a voltage from a dc source to the heating coil by varying the voltage between 3.5-7.0 V. When 1 μL of ethanol solution was injected into the sensor system, the peak areas were measured. The plot of the peak area vs voltage is shown in Figure 3. The optimum heating coil voltage, VH, which gave the largest peak area, was found to be 5.5 V. When a voltage greater than 5.5 V was applied, the response from the TGS 822 sensor head showed a smaller peak area because the sensitivity of the SnO2 thick film depended on the change of chemisorbed oxygen ion on the SnO2 surface [22].


Home-made Detection Device for a Mixture of Ethanol and Acetone
Relationship between peak area and voltage of the heating coil
© Copyright Policy
Related In: Results  -  Collection

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

f3-sensors-07-00202: Relationship between peak area and voltage of the heating coil
Mentions: The best operating temperature of the TGS 822 sensor was determined by applying a voltage from a dc source to the heating coil by varying the voltage between 3.5-7.0 V. When 1 μL of ethanol solution was injected into the sensor system, the peak areas were measured. The plot of the peak area vs voltage is shown in Figure 3. The optimum heating coil voltage, VH, which gave the largest peak area, was found to be 5.5 V. When a voltage greater than 5.5 V was applied, the response from the TGS 822 sensor head showed a smaller peak area because the sensitivity of the SnO2 thick film depended on the change of chemisorbed oxygen ion on the SnO2 surface [22].

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.