Miniature flow injection analyser for laboratory, shipboard and in situ monitoring of nitrate in estuarine and coastal waters

Gardolinski, Paulo C. F. C.

doi:10.1016/s0039-9140(02)00425-3

Cited by 33 publications

(20 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Gardolinski et al [12] developed a miniaturised, LED-based chemical analyser for in-situ monitoring of nitrate. The limit of detection (LOD) with a 20 mm path length flow cell was 2.8 mg L -1 N. The linear range could be adjusted to suit local conditions in the field by changing the flow cell path length.…”

Section: Examples Of Deployable Microfluidic Devicesmentioning

confidence: 99%

Development and Deployment of a Microfluidic Platform for Water Quality Monitoring

Cleary

Maher

Diamond

2013

Smart Sensors, Measurement and Instrumentation

View full text Add to dashboard Cite

Abstract. There is an increasing demand for autonomous sensor devices which can provide reliable data on key water quality parameters at a higher temporal and geographical resolution than is achievable using current approaches to sampling and monitoring. Microfluidic technology, in combination with rapid and on-going developments in the area of wireless communications, has significant potential to address this demand due to a number of advantageous features which allow the development of compact, low-cost and low-powered analytical devices. Here we report on the development of a microfluidic platform for water quality monitoring. This system has been successfully applied to in-situ monitoring of phosphate in environmental and wastewater monitoring applications. We describe a number of the technical and practical issues encountered and addressed during these deployments and summarise the current status of the technology.

show abstract

Section: Examples Of Deployable Microfluidic Devicesmentioning

confidence: 99%

Development and Deployment of a Microfluidic Platform for Water Quality Monitoring

Cleary

Maher

Diamond

2013

Smart Sensors, Measurement and Instrumentation

View full text Add to dashboard Cite

show abstract

“…Gardolinski et al [22] reported a solid-state flow-cell detector with 20 mm long path length for in-situ measurements of nitrate. We investigated three different path lengths, 10 mm, 20 mm and 30 mm flow-cell detectors being made out of thick rubber block.…”

Section: Long Path-length Flow Cellmentioning

confidence: 99%

Determination of trace amounts of phosphate by flow-injection photometry

Karthikeyan

Hashigaya

Kajiya

et al. 2004

Analytical and Bioanalytical Chemistry

View full text Add to dashboard Cite

This paper describes a simple and rapid procedure for determination of traces of phosphate by means of molybdenum blue chemistry. The use of a cost-effective home-made flow cell with a long path length in combination with a light emitting diode (LED) and a photodiode (PD) is demonstrated as a simple absorbance detector for flow-injection analysis. In this method, a sample is injected into the carrier stream through an injection valve and mixed online with mixed reagent (a mixture of molybdate, bismuth, and ascorbic acid in sulfuric acid). The color intensity of the resulting association complex, molybdenum blue, is measured photometrically ( lambda(max) 875 nm). The proposed method can be used to detect phosphate in the range 0.02-4.0 mg x L(-1) and the precision of the proposed procedure is less than 5% at 0.1 mg x L(-1) phosphorus as phosphate. The method has been successfully applied to a variety of natural water samples.

show abstract

“…The determination of nitrate was achieved by on-line reduction to nitrite with the copperized cadmium column before its reaction with sulfanilamide and NEDA. From previous literature, 9,10 it is prominent that the reduction should be carried out in a neutral or slightly alkaline medium to prevent any further reduction of NO2 -to NO -because of its similar electromotive forces (Eo). For this reason, ammonium chloride is usually employed as the carrier stream.…”

Section: Laboratory Optimizationmentioning

confidence: 99%

“…10 For on-line reduction, the mini column's length in the range of 5 -20 cm long has been employed by previous authors. 9 We have used a column of 2.5 cm length (2 mm i.d.) which was sufficient for quantitative reduction (> 95%), which resulted in minimizing back pressure problems.…”

Section: Laboratory Optimizationmentioning

confidence: 99%