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Automatic continuous river monitoring of nitrate using a novel ion-selective electrode

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Automatic continuous river monitoring of nitrate using a novel ion-selective electrode

Content Provider	Royal Society of Chemistry (RSC)
Author	Braven, Jim Scholefield, David Ebdon, Les Goff, Thierry Le
Copyright Year	2003
Abstract	On-site continuous measurement of nitrate in the River Taw situated in Devon (UK) was performed automatically for two months using a recently developed ion-selective electrode (ISE). A non-submersible electrode support system was developed and a field instrument was constructed comprising the nitrate-ISEs, a reference electrode and a temperature probe connected through a pre-amplifier to a data-logger and battery supply. The nitrate-ISE was constructed using a commercially available electrode body with a membrane incorporated into the tip. This rubbery membrane contained the sensor molecule (N,N,N-triallylleucine betaine chloride, 6.5% m/m) covalently bound to polystyrene–block–polybutadiene–block–polystyrene, SBS, (43.5% m/m), with 2-nitrophenyloctyl ether (2-NPOE) as mediator (40% m/m). The Nernstian slope was −59.1 mV per decade over a linear range of 1400–0.07 mg L−1 nitrate-N. The limit of detection was 0.007 mg L−1 nitrate-N with a selectivity coefficient for nitrate against chloride (kpotNO3−, Cl−) of 3.4 × 10−3. The speed of response was less than a minute over the linear Nernstian range. The lifetime in the laboratory exceeded 5 months with no potentiometric drift over the linear Nernstian range. A temperature correction algorithm was also used to accomodate the temperature changes encountered in the river. The river nitrate results obtained with the ISEs at hourly intervals compared very favourably (R2 = 0.9) with those obtained with laboratory automated chemical determinations made on contemporaneous river samples over a concentration range 0.55–2.00 mg L−1 nitrate-N. The ISEs did not require re-calibration and no deterioration in performance or fouling of the membrane surface was observed during 40 days.
Starting Page	353
Ending Page	358
Page Count	6
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	5
Issue Number	2
Journal	Journal of Environmental Monitoring
DOI	10.1039/b211140n
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SBS Taw Devon UK Nitrate River Taw Ion selective electrode Electrode Reference electrode Data logger Betaine Chloride Special Broadcasting Service 1-(2-Nitrophenoxy)octane Algorithm
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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CONSTRUCTION OF A POLYMERIC LIQUID-MEMBRANE ION-SELECTIVE ELECTRODE (ISE)AND ITS APPLICATION FOR DETERMINATION OF NITRATE IN TOMATOES

POTENTIOMETRIC RESPONSE OF POLYMERIC LIQUID MEMBRANES BASED ON QUATERNARY AMMONIUM SALTS FOR NITRATE ION DETERMINATION

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Automatic continuous river monitoring of nitrate using a novel ion-selective electrode

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