Amperometric Sensing of Ethylene Oxide in the Gas Phase

Hodgson, Alexia W.E.; Jacquinot, Patrick; Hauser, Peter C.

doi:10.1021/ac991247l

Cited by 18 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal-SPE based gas sensors have been developed in our group for methane [35], ethylene [36], ethylene oxide [37], acetylene [38], formaldehyde [39], acetaldehyde/ethanol [31], SO 2 [40], NO and NO 2 [41]. This electrode architecture is based on a porous sensing electrode which is directly exposed to the gas phase and separated from the electrolyte solution by a non-porous ion-conducting membrane such as Nafion.…”

Section: Simulation Of a Metal-spe Electrodementioning

confidence: 99%

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase

Jacquinot

Hauser

2003

Electroanalysis

View full text Add to dashboard Cite

The detection of CO 2 in the gas phase is possible in presence of oxygen with an amalgamated Au-poly(tetrafluoroethylene) gas diffusion electrode and an internal electrolyte solution containing Ni(II)cyclam. For concentrations between 0.1 to 1% the electrochemical cell has a sensitivity of 3.58 mA % À1 and the detection limit is 500 ppm. In preliminary experiments at rotating disk electrodes the optimum pH-range was found to be between 3.5 to 6 and a selectivity ratio of the catalyst for CO 2 /H of 5 : 1 could be determined. The relationship between reduction current and the square root of the angular speed is linear, indicating that the electrochemical process is limited by diffusion of CO 2 . Tl and Pb are presented as alternative electrode materials at which the Ni(II)cyclam catalyzed reduction of CO 2 can be observed. Problems arise from fouling effects at the sensing electrode and a non-linearity of the calibration plot at higher concentrations.

show abstract

Section: Simulation Of a Metal-spe Electrodementioning

confidence: 99%

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase

Jacquinot

Hauser

2003

Electroanalysis

View full text Add to dashboard Cite

show abstract

“…A basic amperometric electrochemical sensor is comprised of at least two electrodes held at a fixed voltage. The working electrodes typically are made of platinum or gold [15][16][17] . As shown in Figure 1.1, when the analyte airstream is passed over the sensor, a portion of the molecules diffuse through a membrane and are oxidized at the air-metal interface on a working electrode.…”

Section: Theory Of Operation Electrochemical Ethylene Sensormentioning

confidence: 99%

Sensors and Portable Instruments for Postharvest Agriculture

Lerud¹

2000

View full text Add to dashboard Cite

The sensing needs for the fresh produce industry can be split into two primary stages: during maturation in the field, also referred to as Precision Farming, and during storage and transport of the produce, or Postharvest Storage. This work seeks to improve the accuracy and reliability of commercially available electrochemical and spectroscopic sensors tailored to the sensing needs of the fresh produce industry. For electrochemical

show abstract

“…The OSHA recommended exposure limit (REL) for ethylene oxide is 0.1 ppm as an 8-hour time-weighted average (TWA) with 10-minute ceiling limit of 5 ppm whereas the OSHA permissible exposure limit (PEL) is 1 ppm as an 8-hour TWA with a 15-minute excursion limit of 5 ppm [9]. Many methods have been developed to monitor ethylene oxide in air such as charcoal tube [10], HBr coated charcoal tube [11], Tedlar gas bag [12], impinger [3], badge [13], 3M charcoal disc [14] passive dosimeter [15] and direct reading with IR, photoionization detector and chromatographic gas [3], gas sensor [16] and also bio-monitoring [6,17].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Validation and Field Verification of Silica Gel Sampling Tube for Measuring Ethylene Oxide in Air

Chong¹,

Ibrahim²,

Goh³

2012

MJS

View full text Add to dashboard Cite

A sampling and analytical method for the measurement of ethylene oxide (EtO) level in air was developed. The procedure was based on the entrapment of ethylene oxide in an activated silica gel adsorbent inside a sampling tube. The ethylene oxide was desorbed by distilled water and the eluent was analyzed by gas chromatography with flame ionization detector. Parameters such as breakthrough volume, method detection limit, desorption efficiency and storage tests for 14 days in ambient temperature and refrigerator were determined. Field samplings were performed at two factories in Kulim and Pulau Pinang respectively, which use ethylene oxide gas as sterilization substance. The desorption efficiency of ethylene oxide from silica gel tube was determined to be 87.8% over concentration range of 0.2 -4.0 ppm in 3 liters of air sample. The method detection limit was determined to be 1.0 ppm whereas the precision of procedure was 10.7%. All the parameters were shown to be meeting OSHA requirements. ABSTRAKSatu kaedah persampelan dan analisis untuk mengukur tahap etilena oksida dalam udara telah dibangunkan. Prosedur ini berasaskan pemerangkapan etilena oksida dalam penjerap gel silika yang telah diaktifkan dalam suatu tiub persampelan. Etilena oksida telah didejerap dengan menggunakan air suling dan eluen tersebut dianalisis dengan gas kromatografi yang dielengkapi dengan pengesan pengionan nyala. Parameter seperti keberkesanan pendejerapan etilena oksida daripada tiub silika, isipadu penembusan, had pengesanan kaedah, keberkesanan pendejerapan dan ujian penyimpanan selama 14 hari pada suhu ambien (27 0 C) dan suhu peti sejuk (4 0 C) telah ditentukan. Persampelan lapangan telah dilakukan di dua buah kilang masing-masing di kulim dan Penang yang menggunakan etilena oksida sebagai bahan pensterilan. Keberkesanan pendejerapan etilena dioksida daripada tiub gel silica telah ditentukan sebagai 87.8 % pada julat kepekatan 0.2-4.0 ppm untuk tiga liter sampel udara. Had pengesanan kaedah telah ditentukan sebagai 1.0 ppm manakala kejituan prosedur adalah 10.7 %. Semua parameter yang dikaji menunjukkannya memenuhi syarat OSHA.

show abstract

Amperometric Sensing of Ethylene Oxide in the Gas Phase

Cited by 18 publications

References 24 publications

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase

Sensors and Portable Instruments for Postharvest Agriculture

Laboratory Validation and Field Verification of Silica Gel Sampling Tube for Measuring Ethylene Oxide in Air

Contact Info

Product

Resources

About

Amperometric Sensing of Ethylene Oxide in the Gas Phase

Cited by 18 publications

References 24 publications

Ni(II)cyclam Catalyzed Reduction of CO2 – Towards a Voltammetric Sensor for the Gas Phase

Ni(II)cyclam Catalyzed Reduction of CO2 – Towards a Voltammetric Sensor for the Gas Phase

Sensors and Portable Instruments for Postharvest Agriculture

Laboratory Validation and Field Verification of Silica Gel Sampling Tube for Measuring Ethylene Oxide in Air

Contact Info

Product

Resources

About

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase

Ni(II)cyclam Catalyzed Reduction of CO₂ – Towards a Voltammetric Sensor for the Gas Phase