Rapid spectrophotometric determination of total phosphorus in industrial wastewaters by flow injection analysis including a capillary digestor

Aoyagi, Masaya; Yasumasa, Yoshiaki; Nishida, Akemi

doi:10.1016/s0003-2670(00)80444-4

Cited by 37 publications

(5 citation statements)

References 5 publications

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“…The molybdenum blue method can be applied to the total phosphorus determination after the decomposition of organic and inorganic phosphorus compounds, organic and inorganic condensed phosphorus compounds, and solid and dissolved phosphorus compounds to orthophosphate by heating at high temperature (120-160 • C) [59,60], at high temperature with a platinum wire in a reaction coil [61], or by irradiating UVlight to aqueous samples containing persulfate [47,55]. By using a reaction coil, which is wound on two low-pressure mercury lamps (14 mm o.d., 134 mm length, 4 W germicidal use), most organic phosphorus compounds were decomposed to orthophosphate at 70 • C: LOD was 1 g/l of phosphorus at 830 nm [55].…”

Section: Trace Analysis For Phosphorus By Flow-injection Techniquementioning

confidence: 99%

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Trace and ultratrace analysis methods for the determination of phosphorus by flow-injection techniques

Motomizu¹,

Li²

2005

Talanta

104

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Section: Trace Analysis For Phosphorus By Flow-injection Techniquementioning

confidence: 99%

“…Later, the mixed reagent solution was improved by the addition of an anionic surfactant together with ethanol [68]. The MG method was applied to the determination of total phosphorus in industrial waste waters by on-line digestion/spectrophotometric FIA [61].…”

Section: Trace Analysis For Phosphorus By Flow-injection Techniquementioning

confidence: 99%

Trace and ultratrace analysis methods for the determination of phosphorus by flow-injection techniques

Motomizu¹,

Li²

2005

Talanta

104

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“…The measurement of total phosphorus in water involves digestion of a test sample with persulfate for prolonged periods of time; Ayoagi et al . used a 10-m-long PTFE reactor with a Pt wire inserted in it to catalyze this reaction. They used the wire simply for the purposes of catalysis and not for heating, the reactor was externally heated by immersion in an external hot bath.…”

Section: Resultsmentioning

confidence: 99%

An Energy-Efficient Self-Regulating Heater for Flow-Through Applications

Dasgupta

Loree

et al. 2003

Anal. Chem.

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In many experiments, a flow-through heating arrangement is needed to reduce reaction time. Often the reaction conditions require inertness of the wetted material. Heated reactors based on polymeric tubing, notably PTFE, are the most common, and such reactors are typically used in a manner in which they are put in a heated bath or an otherwise thermally conductive potting in which a heater and a temperature sensor are embedded for heating and temperature control. Polymeric tubes are poor conductors of heat; as such, most reactors of this type have very poor energy utilization. We describe here heated flow-through reactors where a wire runs through the entire length of the tubular reactor and where the wire is directly electrically heated. The wire may or may not be electrically insulated. If the exterior of the tube is well insulated, the energy efficiency of such a reactor in heating the fluid of interest is nearly unity. This makes it most suitable for battery-powered applications. If an appropriate wire with a significant temperature coefficient of resistance is chosen, monitoring the current through the device at constant applied voltage indicates the effective mean temperature of the device and thus allows effective temperature control without an additional sensor/controller with essentially instantaneous response. Temperature control within +/- 0.4 degrees C at a mean temperature of 65 degrees C and within +/- 0.9 degrees C at 87 degrees C have been achieved.

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“…The same method was also used for molybdenum determination [132]. A rapid determination of total phosphorus in industrial waste waters, including a capillary digestor, was described by Aoyagi et al [133].…”

Section: Sampling Systemsmentioning

confidence: 99%

State of the art in on‐line techniques coupled to flow injection analysis FIA/on‐line‐ a critical review

Puchades

Maquieira

Atienza

et al. 1990

Journal of Analytical Methods in Chemistry

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Flow injection analysis (FIA) has emerged as an increasingly used laboratory tool in chemical analysis. Employment of the technique for on-line sample treatment and on-line measurement in chemical process control is a growing trend. This article reviews the recent applications of FlA. Most papers refer to on-line sample treatment. Although FIA is very well suited to continuous on-line process monitoring, few examples have been found in this areamost of them have been applied to water treatment or fermentation processes.

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Rapid spectrophotometric determination of total phosphorus in industrial wastewaters by flow injection analysis including a capillary digestor

Cited by 37 publications

References 5 publications

Trace and ultratrace analysis methods for the determination of phosphorus by flow-injection techniques

Trace and ultratrace analysis methods for the determination of phosphorus by flow-injection techniques

An Energy-Efficient Self-Regulating Heater for Flow-Through Applications

State of the art in on‐line techniques coupled to flow injection analysis FIA/on‐line‐ a critical review

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