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Continuous and Inexpensive Monitoring of Nonpurgeable Organic Carbon by Coupling High-Efficiency Photo-oxidation Vapor Generation with Miniaturized Point-Discharge Optical Emission Spectrometry
journal contribution
posted on 2017-07-14, 00:00 authored by Shu Zhang, Yunfei Tian, Hongling Yin, Yubin Su, Li Wu, Xiandeng Hou, Chengbin ZhengCurrently, no applicable analyzers
are available to accomplish online continuous monitoring of organic
pollution, which is one of the most important factors contributing
to water shortages around the world, particularly in developing countries.
In this work, a sensitive, miniaturized, inexpensive, and online nonpurgeable
organic carbon (NPOC) analysis system was developed for continuous
monitoring of such organic pollution. This system consists of a specially
designed high-efficiency UV photo-oxidation vapor generation (HE-POVG)
reactor and a miniaturized, low-power (7 W) point-discharge microplasma
optical emission spectrometer (PD-OES). Organics present in sample
or standard solutions are pumped to the HE-POVG and efficiently converted
into CO2, which is separated and further transported to
the PD-OES for NPOC analysis via highly sensitive detection of carbon
atomic emission at 193.0 nm. Under optimal conditions, a limit of
detection of 0.05 mg·L–1 (as C) is obtained,
with precision better than 5.0% (relative standard deviation) at 5
mg·L–1. This system overcomes many shortcomings
associated with conventional chemical oxygen demand or total organic
carbon analyzers such as long analysis time, use of expensive and
toxic chemicals, production of secondary toxic waste, requirement
of large, power consuming and expensive instrumentation and difficulties
implementing continuous online monitoring. The system was successfully
applied to sensitive and accurate determination of NPOC in various
water samples and for continuous monitoring of such organic pollution
in tap water.
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carbon analyzersInexpensive Monitoringchemical oxygen demand193.0 nmdetectionNonpurgeable Organic CarbonPD-OESNPOC analysishigh-efficiency UV photo-oxidation vapor generationCO 2High-Efficiency Photo-oxidation Vapor GenerationHE-POVGanalysis timemganalysis systemwater shortagesemission spectrometerpoint-discharge microplasmamonitoringMiniaturized Point-Discharge Optical Emission Spectrometrywater samples
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