Simultaneous determination of dysprosium and iron in urine by capillary zone electrophoresis coupled to cloud point extraction

Ortega, Claudia; Cerutti, Soledad; Olsina, Roberto A.; Martínez, Luis D.; Silva, María Fernanda

doi:10.1016/j.jpba.2004.08.027

Cited by 39 publications

(20 citation statements)

References 28 publications

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“…Therefore, compared to the results obtained by other authors [6][7][8][9][10][11][12][13], the present on-line CPE/FIA system had many advantages, such as high sensitivity, high sample throughput, high extraction efficiency and simplicity. Experimental factors which govern the magnitude of the preconcentration factors and the CL intensity were studied.…”

Section: Introductionmentioning

confidence: 83%

“…When compared to all the reported on-line CPE/FIA papers [6][7][8][9][10][11][12][13], the key difference/improvement of the present on-line CPE/FIA system was that the collection column served a dual function: (1) to entrap the analyte-containing surfactant aggregates and (2) to provide CL emission (i.e., the collection column was mounted directly adjacent to the detector). Table 1 shows the effects on the CL intensity as a function of the presence (or absence) of the analyte (bilirubin), surfactant (Triton X-114), salting-out agent (Na 2 SO 4 ) and/or filtering material (cotton).…”

Section: Collection Columnmentioning

confidence: 99%

“…The analytical capability of this automated system was demonstrated for the determination of coproporphyrin in pretreated urine samples. Subsequently, this on-line CPE/FIA methodology was adopted by other researchers for the rapid and sensitive determination of metal species [7][8][9][10][11][12] and PAHs [13]. However, the preconcentration/enhancement factors reported were lower than that predicted by theoretical calculations [14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Song

Lin

et al. 2007

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 83%

Section: Collection Columnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Song

Lin

et al. 2007

Analytica Chimica Acta

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“…The previous literature review conducted to determine the iron element in various samples by using cloud point extraction method that is coupled with different techniques such as: flame atomic absorption spectrometry (FAAS) [12,15,16], UV-visible spectrophotometer [17,18], inductively coupled plasma mass spectrometry [19], graphite furnace atomic absorption spectrometry [20] and capillary electrophoresis [21]. The urine has a pH of 5.5-7.0 and a range of 6.2 [22], while the concentration of iron element in the urine is estimated to be about the median and range concentration of iron in urine was 4.9 ng mL -1 and < 2.1-16.4 ng mL -1 [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Cloud Point Extraction and Determination of Trace Iron(III) in Urine Samples by Spectrophotometry and Flame Atomic Absorption Spectrometry

Khudhair¹,

Hassan²

2017

Asian J. Chem.

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Cloud point technique used effectively for extraction and pre-concentration of iron(III) in the urine samples of occupational workers prior measured by using flame atomic absorption spectrometry and UV-visible spectrophotometer. The metal responds with benzidine as reagent in a non-ionic surfactant Triton X-114 medium. The main factors affecting cloud point extraction efficiencies, such as pH of sample solution, concentration of benzidine reagent, type of surfactant, concentration of Triton X-114, effect of salt out, influence of interferences and impact of equilibration temperature and time were studied. The calibration curve was linear in the range of 0.25-3.0 µg mL -1 with r 2 = 0.9655 for UV-visible spectrophotometer at λmax 425 nm. The limit of detection was 0.25 µg mL -1 . The relative standard deviation for six replicates was 3.071 %.

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“…4 Many methods have been reported for iron determination including atomic absorption spectrometry (AAS), 5 inductively coupled plasma mass spectrometry (ICP-MS), 6 inductively coupled plasma atomic emission spectrometry (ICP-AES), 7 high performance liquid chromatography (HPLC), 8 and capillary electrophoresis (CE). 9 Most of these methods have good sensitivity but require very expensive instruments and some of them cannot distinguish between the different oxidation states of metals. The spectrophotometry is commonly used for determination of trace of iron is based on the reaction of iron(III) with various chromogenicre agents, such as azo reagents, 10 triphenylmethane reagents, 11 alizarine yellow R, 12 and nitrosonaphthol sodium sulfonates.…”

Section: Introductionmentioning

confidence: 99%

Study of Ascorbic Acid as Iron(III) Reducing Agent for Spectrophotometric Iron Speciation

Elmagirbi

Sulistyarti

Atikah

2012

J. Pure App. Chem. Res.

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The study of ascorbic acid as a reducing agent for iron(III) has been investigated in order to obtain an alternative carcinogenic reducing agent, hydroxylamine, used in spectrophotometric standard method based on the formation of a red-orange complex of Fe(II)-o-phenanthroline. The study was optimised with regards to ascorbic acid concentration as well as pH solution. The results showed that ascorbic acid showed maximum capacity as reducing agent of iron(III) under concentration of 4.46.10 -4 M and pH solution of 1-4.Under these conditions, ascorbic acid reduced iron(III) proportionally and performed similarly to that of hydroxylamine. The method gave result to linear calibration over the range of 0.2-2 mg/L withhigh accuracy of 97 % and relative standard deviation of less than 2 %. This method was successfully applied to assay iron speciation in water samples.Keyword: Iron, speciation, ascorbic acid, o-phenanthroline, spectrophotometry INTRODUCTIONIron is the second most abundant metallic element in the earth's crust and is essential in the metabolism of plants and animals. If presented in excessive amounts; however, it forms oxyhydroxide precipitate that stains laundry and porcelain. As a result, the recommended limit for iron in domestic water supplies is 0.3 mg/L. 1 Determination of Fe(II) and Fe(III) is important in many natural sciences like geology, agriculture, biology or environmental protection, mainly on account of different bioavailability and metabolism of iron on its two oxidation states. Iron(II) is essential for good health, as it helps transport oxygen in the blood and storage of oxygen by means of haemoglobine and myoglobine.2 Iron deficiency may lead to low immunity and infectious diseases. If the human body takes in too much iron will cause excretory functional disturbance and likely have greater carcinogenic potential. Both Fe (II) and Fe(III) are important in the biosphere, serving as an active centre of a wide range of proteins such as oxidases, reduces and dehydrates.3 However the plants need a certain amount of iron(II) to survive. Iron helps them create chlorophyll and aids in several other chemical processes plants perform. However, too much iron can have a toxic effect on the plant, weakening and eventually killing it. It should be noted that plants only absorb ferrous iron particles from the soil, and that other forms of iron will not affect plants.

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Simultaneous determination of dysprosium and iron in urine by capillary zone electrophoresis coupled to cloud point extraction

Cited by 39 publications

References 28 publications

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Cloud Point Extraction and Determination of Trace Iron(III) in Urine Samples by Spectrophotometry and Flame Atomic Absorption Spectrometry

Study of Ascorbic Acid as Iron(III) Reducing Agent for Spectrophotometric Iron Speciation

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