The use of a Brewer 'bubbler' as a continuous surface ozone sensor

Sreedharan, C. R.; Tiwari, V. S.

doi:10.1088/0022-3735/4/9/019

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…These two electrons form the ozone current and absolute value of ozone is recorded by a 0-1 μA strip chart recorder. The accuracy of the ozone measurements by this technique has been estimated to be ±10% (Sreedharan and Tiwari 1971). Maximum temperature has been measured with the help of a Maximum-Minimum Thermometer and relative humidity has been estimated by standard method using measurement of dry bulb and wet bulb temperatures.…”

Section: Methodsmentioning

confidence: 99%

Surface ozone scenario at Pune and Delhi during the decade of 1990s

et al. 2012

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Delhi are analyzed in terms of its frequency distribution, annual trend, diurnal variation and its relation with various meteorological and chemical parameters. It is found that the surface ozone concentration range showing highest frequency of occurrence at Pune is 0-5 ppb during winter and post-monsoon seasons and 15-20 ppb and 5-10 ppb during summer and monsoon seasons, respectively. It is 0-5 ppb at Delhi during all the seasons. The surface ozone concentration has shown a decreasing trend at Pune during the observational period with an average rate of decrease of 1.54 ppb/year. On the other hand, there is no trend whatsoever in the variation of surface ozone concentration at Delhi. Minimum value of surface ozone occurs before sunrise and maximum in the afternoon hours. Regression analyses of surface ozone with maximum temperature (r = 0.46 for Pune and 0.51 for Delhi, significant at more than 0.1%) and NO 2 at respective locations indicate that surface ozone at these locations is mainly produced by photochemistry. Transport mechanism is also understood to have contributed significantly to the total concentration of ozone. Inverse relationship obtained between surface ozone concentration and relative humidity indicates that major photochemical paths for removal of ozone become effective when humidity increases at these locations.

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Section: Methodsmentioning

confidence: 99%

Surface ozone scenario at Pune and Delhi during the decade of 1990s

et al. 2012

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“…The procedure of operation, the working principle of the instrument and other details are given by Sreedharan and Tiwari [28]. O 3 was continuously measured by electrochemical ozone sensor (KI method) all 24 h during the study period.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Air pollution effect of O3 on crop yield in rural India

Debaje

Kakade

Jeyakumar³

2010

Journal of Hazardous Materials

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“…The electrochemical O 3 sensors have been used for simultaneous continuous measurements of O 3 at all the five sites [22]. The detection limit of the O 3 instrument is 1 ppbv and the precision better than ±2% [23].…”

Section: Ozone Measurements Techniquementioning

confidence: 99%