Determination of total phosphorus in waters and wastewaters by on-line UV/thermal induced digestion and flow injection analysis

Benson, Richard L.; McKelvie, Ian D.; Hart, Barry T.; Truong, Yen Bach; Hamilton, I.C.

doi:10.1016/0003-2670(96)00044-x

Cited by 55 publications

(33 citation statements)

References 17 publications

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“…Because Fe(III) was reduced to Fe(II) and then masked by EDTA, enough masking seems to be achieved in our analysis, and no peak tailing was observed in practical steel sample analyses. Up to an amount 5ϫ10 4 times that of P(V), Fe(II) did not interfere with the determination of P(V) by the proposed method.…”

Section: Effect Of Coexisting Elementsmentioning

confidence: 90%

“…For the determination of phosphorus by FIA, two or three flow tubes are generally used in the conventional methods. 3,4,7,13) Although our new analytical method employs five flow tubes, it is not troublesome because two of them are for concentration.…”

Section: Flow Systemmentioning

confidence: 99%

“…However, 90°C was chosen as the reaction coil temperature because, though a 2 m long cooling coil was used, bubble generation made the measurement difficult. In conventional FIA analyses, 80°C, 3) 90°C, 4) and 140°C 7,13) are used.…”

Section: Effect Of Reaction Coil Temperaturementioning

confidence: 99%

“…However, flame atomic absorption spectroscopy and ICP-AES, both said to be highly sensitive, are not sensitive enough for phosphorus (their detection limits are 100 ppm and 30 ppb, respectively). 1) Instead, highly sensitive spectrophotometric methods using Molybdenum Blue [2][3][4][5][6][7] and Malachite Green 3,8) are generally used to analyse steel. Determination of extremely small amounts of phosphorus, hardly achievable by these spectrophotometric methods alone, needs the use of such separation and concentration methods as coprecipitation, 2,8) solvent extraction, 9) collection with membrane filter, 10) and ion exchange 11) in the analysis.…”

Section: Introductionmentioning

confidence: 99%

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Flow Injection Analysis of Phosphorus in Steel Using Filter Tube Preconcentration

2003

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A flow injection analysis (FIA) of phosphorus using coprecipitation with beryllium hydroxide was performed. An on-line preliminary concentration method using a filter tube was developed and this method was applied to the determination of phosphorus in steel. Phosphorus was coprecipitated with beryllium hydroxide by increasing the pH of the medium in the flow tube, and the precipitate was collected with the filter tube (pore size: 1.0 mm, inner diameter: 1.0 mm, length: 7 cm). The precipitate collected was eluted with an acid. The resulting eluate was allowed to react with ammonium molybdate in the presence of antimony, and was then reduced with ascorbic acid. The amount of the phosphorus-antimony-molybdenum ternary complex thus formed was determined spectro-photometrically to be 890 nm. Concentration was performed for 10 min at a flow rate of 0.75 mL/min and the acid used for elution was 1 M HNO 3 . During sample preparation, matrix iron was reduced with sodium hydrogen sulfite and masked with EDTA. The concentration process yielded a sensitivity of analysis about 25 times higher than that of conventional methods. In 0.03 g of steel sample, the method proposed here gave measurements equivalent to those of the phosphorus contents in standard steel samples , and were thus in good agreement with the guaranteed values. The possible range of phosphorus determination is from 0.0021 to 0.017 % in steels.

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Section: Effect Of Coexisting Elementsmentioning

confidence: 90%

Section: Flow Systemmentioning

confidence: 99%

Section: Effect Of Reaction Coil Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow Injection Analysis of Phosphorus in Steel Using Filter Tube Preconcentration

2003

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“…The sensor for water-quality monitoring usually requires a digestion pretreatment of the aqueous sample with a temperature higher than 100 C to decompose the dissolved organic compounds into ionic radicals for indicative species detection. [23][24][25][26][27][28] Therefore, it is in high demands to integrate all the functional components including pressure regulator, heater, and temperature sensor into a single device.…”

Section: Introductionmentioning

confidence: 99%

Continuous flowing micro-reactor for aqueous reaction at temperature higher than 100 °C

Xie

Wang

et al. 2013

Biomicrofluidics

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Some aqueous reactions in biological or chemical fields are accomplished at a high temperature. When the reaction temperature is higher than 100 C, an autoclave reactor is usually required to elevate the boiling point of the water by creating a high-pressure environment in a closed system. This work presented an alternative continuous flowing microfluidic solution for aqueous reaction with a reaction temperature higher than 100 C. The pressure regulating function was successfully fulfilled by a small microchannel based on a delicate hydrodynamic design. Combined with micro heater and temperature sensor that integrated in a single chip by utilizing silicon-based microfabrication techniques, this pressure regulating microchannel generated a high-pressure/high-temperature environment in the upstream reaction zone when the reagents continuously flow through the chip. As a preliminary demonstration, thermal digestion of aqueous total phosphorus sample was achieved in this continuous flowing micro-reactor at a working pressure of 990 kPa (under the working flow rate of 20 nl/s) along with a reaction temperature of 145 C. This continuous flowing microfluidic solution for high-temperature reaction may find applications in various micro total analysis systems. V C 2013 AIP Publishing LLC. [http://dx

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Flow Injection Spectrophotometric Determination of the Antibiotic Fosfomycin in Pharmaceutical Products and Urine Samples after On-line Thermal-Induced Digestion

Tzanavaras

Themelis

2002

Analytical Biochemistry

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Determination of total phosphorus in waters and wastewaters by on-line UV/thermal induced digestion and flow injection analysis

Cited by 55 publications

References 17 publications

Flow Injection Analysis of Phosphorus in Steel Using Filter Tube Preconcentration

Flow Injection Analysis of Phosphorus in Steel Using Filter Tube Preconcentration

Continuous flowing micro-reactor for aqueous reaction at temperature higher than 100 °C

Flow Injection Spectrophotometric Determination of the Antibiotic Fosfomycin in Pharmaceutical Products and Urine Samples after On-line Thermal-Induced Digestion

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