Stopped-flow injection simultaneous determination of phosphate and silicate using molybdenum blue

Grudpan, Kate; Ampan, P; Udnan, Yuthpong; Jayasvati, Subhachai; Lapanantnoppakhun, Somchai; Jakmunee, Jaroon; Christian, Gary D.; Růžička, Jaromír

doi:10.1016/s0039-9140(02)00441-1

Cited by 49 publications

(16 citation statements)

References 18 publications

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“…The stopped flow injection method can increase sensitivity of the measurement by increasing the residence time [16,17]. Travelling time is the time from injection to the stopping time depend on the physical parameters in which increase with increase reaction coil and sample manifolds parameters, the travelling time after each injection was studied and established that sample zone achieved the flow cell 30 and 25 s of the two methods after each injection and the time intervals between stopping and resuming the pump flow, in the range (10-260 s) were also studied, it was injected 30 µg mL -1 for method A, 35 µg mL -1 for method B.…”

Section: Supplements Diatery Preparationmentioning

confidence: 99%

Stopped-Flow Injection and Spectrophotometric Methods of Quercetin Dihydrate Determination by Using Two Reagents (2,4-Dichloroaniline and p-Aminoacetophenone)

Mahmood¹,

Abed²

2018

Asian J. Chem.

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A stopped flow injection and spectrophotometric method were used to estimate of quercetin dihydrate in pure and supplement preparations were suggested. This method was depend on coupling reaction between quercetin dihydrate and diazotized reagents 2,4-dichloroaniline (method A) and p-aminoacetophenone (method B) in alkaline medium to form water soluble with orange colour dyes. These dyes are steady and have a maximum absorbance at 420 nm in method A and 413 nm in method B. Calibration graphs showed that a Beer's law is obeyed over the range of concentration 0.4-50 and 0.4-45 µg mL -1 for quercetein dihydrate with a detection limit 0.3715 and 0.385 for method A and B, respectively. The sample through put is 27 and 24 for method A and B, respectively. The suggested methods were successfully applied for the evaluation of quercetin dihydrate in dietary supplements.

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Section: Supplements Diatery Preparationmentioning

confidence: 99%

Stopped-Flow Injection and Spectrophotometric Methods of Quercetin Dihydrate Determination by Using Two Reagents (2,4-Dichloroaniline and p-Aminoacetophenone)

Mahmood¹,

Abed²

2018

Asian J. Chem.

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“…By stopping the flow the residence time can be prolonged without increasing the length of the reaction coil, thus avoiding an increase of dispersion [21,22] Travelling time " period from the injection to the stopping time" depend on the physical parameters in which increase with increase reaction coil and sample manifolds parameters, the travelling time after each injection was studies and it was found that the sample zone reached the flow cell 30 sec after each injection, and the time intervals between stopping and restarting the pump flow, in the range(10-100sec) was also studies, it found after 50 sec ( Figure 3) the stopping time this time was selected as the optimum interval time. …”

Section: Figurementioning

confidence: 99%

Normal Flow and Stopped Flow Injection Spectrophotometric Determination of Quercetin Dihydrate Dietary Supplements

2017

IJSR

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Simple and sensitive normal flow injection(nFI) and stopped-FI spectrophotometric methods for the determination of quercetin dehydrate (QRC) in pure form were proposed, The methods were based on diazotization and coupling reaction between QRC and diazotized metoclopramide in alkaline medium to form orange-water soluble dye. The dye is stable and has a maximum absorbance at 438nm. A calibration graph shows that a Beers law is obeyed over the concentration range of 1-60µg.ml -1 and 0.8-50µg.ml -1 for (QRC) with a detection limit is 0.4166 µg.ml

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“…The main interferences in the phosphorus determination by the molybdenum blue method in soil extracts are orthosilicate ions via the formation of silicic molybdic acid, 25 dissolved organic matter 26 and metallic ions that can precipitate as phosphates.…”

Section: Interference Studiesmentioning

confidence: 99%

A Multi-Pumping Flow System with Pulsed Fluidization to Evaluate Soil Capacity for Phosphate Adsorption

Machado¹,

Melchert²,

Zagatto³

et al. 2016

J. Braz. Chem. Soc.

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Soils with high levels of iron and aluminum, thus negatively the phosphorous availability, affecting crop yields. A prior determination of the soil capacity to adsorb phosphate is relevant to attaining good agricultural performance. To this end, a multi-pumping flow system with pulsed fluidization is proposed. The procedure takes into account the amount of remaining phosphorus (P-rem) in the solution after the adsorption step to indirectly estimate the soil retention capacity. A 1.0 mg L -1 P solution is passed through a fluidized bed column with 50 mg of soil (particles < 0.15 mm), where the analyte is adsorbed. P-rem was spectrophotometrically quantified by the molybdenum blue method.

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Stopped-flow injection simultaneous determination of phosphate and silicate using molybdenum blue

Cited by 49 publications

References 18 publications

Stopped-Flow Injection and Spectrophotometric Methods of Quercetin Dihydrate Determination by Using Two Reagents (2,4-Dichloroaniline and p-Aminoacetophenone)

Stopped-Flow Injection and Spectrophotometric Methods of Quercetin Dihydrate Determination by Using Two Reagents (2,4-Dichloroaniline and p-Aminoacetophenone)

Normal Flow and Stopped Flow Injection Spectrophotometric Determination of Quercetin Dihydrate Dietary Supplements

A Multi-Pumping Flow System with Pulsed Fluidization to Evaluate Soil Capacity for Phosphate Adsorption

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