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纳米金电催化传感器系统用于果蔬乙烯监测

来源: R. Shekarriz,W. L. Allen  发布日期: 2019-04-11  点击次数: 20


Maintaining the quality and freshness of fruit and vegetables during transportation and storage is an important role for most postharvest industries. One way to control freshness is by carefully monitoring and regulating exposure to ethylene. By limiting...
 

Nanoporous Gold Electrocatalysis for Ethylene Monitoring and Control

R. Shekarriz,W. L. Allen

Summary:

Maintaining the quality and freshness of fruit and vegetables during transportation and storage is an important role for most postharvest industries. One way to
control freshness is by carefully monitoring and regulating exposure to ethylene. By limiting exposure to ethylene the natural aging process of fresh produce is slowed down, thus prolonging its shelf life. This is especially important for organic produce where the use of chemicals for decay control is not practiced. In this
paper, the performance characteristics and method of use of a new sensing approach for postharvest ethylene measurements is introduced. In this sensor,ETH-1010, oxidation of ethylene on a gold electrocatalyst produces a highly detectable and measurable amperometric signal. ETH-1010 has been packaged into a complete field portable unit. It continuously samples the air at a set flow rate, (commonly between 200 and 500 ml min–1), and reports the ethylene concentration in air at a user-specified time interval. The direct contact between the ethylene molecules in air and electrocatalytic surface renders this process more sensitive and responsive than conventional diffusion-type electrochemical cells. This approach has been shown to be quite effective for continuous monitoring of cold storage rooms, where detection of lower than 10 ppm down to 10 ppb is desirable. This configuration was also used to examine the applicability of electrocatalysis for scrubbing ethylene. Results for ethylene removal have been presented in this paper where the surface reactivity on the electrocatalyst is typically between 0.1 and 0.2 μmol h–1 cm–2. In the sensor, the high reaction rate provides high sensitivity and response time, while making it feasible to consider using electrocatalysis in a scrubbing mode for future applications.


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