Simultaneous Determination of Total Phosphorus and Total Nitrogen by Flow Injection System

Aoyagi, Masaya; Yasumasa, Yoshiaki; Nishida, Akemi

doi:10.2116/analsci.5.235

Cited by 12 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 There are many examples of flow injection analysis (FIA) for the determination of phosphates described in the literature. [5][6][7][8][9][10][11][12] These typically involve the molybdenum blue method, and with these macro-bench systems, the approach works well. However the transfer of this method to a miniaturised, field-deployable, format is difficult for several reasons.…”

Section: Introductionmentioning

confidence: 99%

Analysis of river water samples utilising a prototype industrial sensing system for phosphorus based on micro-system technology

Bowden

Sequiera

Krog

et al. 2002

J. Environ. Monitor.

View full text Add to dashboard Cite

The application of a phosphorus monitoring device based on microsystems technology (MST) to the analysis of river water is presented. An alternative to the standard molybdenum blue method known as the yellow vanadomolybdophosphoric acid method has been very effectively implemented. The method is simple, a reagent and sample are mixed in a 1:1 ratio forming a yellow complex that absorbs strongly below 400 nm in the UV spectrum. The kinetics of the reaction are rapid and sample turnaround is typically 3 min at room temperature. Therefore a very uncomplicated microfluidic design can be adopted. The working wavelength was chosen as 380 nm to coincide with the peak output of a UV-LED narrow bandwidth light source recently developed by Nichia. The limit of detection for the yellow method in the microfluidic system is 0.2 ppm with a dynamic linear range from 0-50 ppm. The method was applied to a measurement of phosphorus in a local river at specific sampling points along its course.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of river water samples utilising a prototype industrial sensing system for phosphorus based on micro-system technology

Bowden

Sequiera

Krog

et al. 2002

J. Environ. Monitor.

View full text Add to dashboard Cite

show abstract

“…[3][4][5] FIA has also been used for phosphate determination in real sample matrices, like those associated with wastewater treatment plants. [6][7][8][9][10] In these systems, mixing of samples and reagents occurs on-line, typically by means of coiled reaction manifolds or special mixing chambers. Total flow rates are typically 1-10 mL min 21 .…”

Section: Introductionmentioning

confidence: 99%

A prototype industrial sensing system for phosphorus based on micro system technology

Bowden

Sequeira

Krog

et al. 2001

Analyst

View full text Add to dashboard Cite

Progress in the development of a miniaturised microfluidic instrument for monitoring phosphorus in natural waters and wastewater is presented. The yellow colorimetric method for phosphate analysis has been transferred to a microfluidic chip configuration This simple method employs one reagent mixed in a 1:1 ratio with a sample to produce a yellow colour absorbing strongly below 400 nm. A stopped flow approach is used which, together with the very rapid kinetics and simple reagent stream, enables a very uncomplicated microfluidic manifold design to be adopted. The working wavelength is 380 nm to coincide with the peak output of a recently developed UV-LED narrow bandwidth light source. The limit of detection for the yellow method is 0.2 ppm with a dynamic linear range from 0-50 ppm possible. The reaction time at room temperature is less than 3 min, which means that up to 20 samples per hour can be analysed.

show abstract

“…The two methods are selective and sensitive but the former uses a toxic mercury compound and the product is unsufficiently defined, whereas the latter is rather slow and requires a long incubation time even at elevated temperatures. Methods based on the absorption of UV radiation 50,51 and on the reaction with o-phthaldialdehyde (OPA) and 2-mercaptoethanol 52 or sulfite 53 have also been used for the determination of ammonia and/or ammonium ions. Fluorometric methods with OPA and sulfite or 2-mercaptoethanol 54-62 , chemiluminescence 63,64 , optosensors 65,66 , the indirect atomic absorption method 67 , and other methods 68 play an important role as well.…”

mentioning

confidence: 99%

Conductimetric Gas Separation-Flow Injection Determination of Ammonia in Gaseous Process Streams

Kubáň

1997

Collect. Czech. Chem. Commun.

View full text Add to dashboard Cite

Ammonia (up to 0.3 vol.%) can be determined (RSDs < 2%) after separation from a process gas stream containing (vol.%): carbon dioxide (0.3-20), hydrogen sulfide (< 0.4), hydrogen cyanide (< 1.5 . 10 -4 ), sulfur dioxide (1), carbon monoxide (< 3) in 50-90 vol.% nitrogen and hydrocarbons. The ammonia content in sample is determined through changes in the conductivity of an acceptor stream (3 mM boric acid) caused by absorption of the analyte passed through a Nafion capillary membrane.

show abstract

Simultaneous Determination of Total Phosphorus and Total Nitrogen by Flow Injection System

Cited by 12 publications

References 1 publication

Analysis of river water samples utilising a prototype industrial sensing system for phosphorus based on micro-system technology

Analysis of river water samples utilising a prototype industrial sensing system for phosphorus based on micro-system technology

A prototype industrial sensing system for phosphorus based on micro system technology

Conductimetric Gas Separation-Flow Injection Determination of Ammonia in Gaseous Process Streams

Contact Info

Product

Resources

About