Selektive spektralphotometrische Bestimmung von Eisen, Kobalt und Mckel nebeneinander mit 1-(2-Pyridylazo)-2-naphthol

Püschel, R.; Laßner, E.; Katzengruber, K.

doi:10.1007/bf00518977

Cited by 28 publications

(3 citation statements)

References 11 publications

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“…The EDTA complexes of cobalt and nickel have been utilized in a simultaneous spectrophotometric method (479). Iron, cobalt, and nickel from chelates with 1 (2-pyridylazo)-2-naphthol which are extractable with chloroform and can be measured spectrophotometrically at 764, 628, and 566 µ, respectively (583). Cobalt and nickel are also determined simultaneously as their chelates of pyridylazochromotropic acid with measurements at 570 and 640 µ (450).…”

Section: Simultaneous Spectrophotometric Determinationsmentioning

confidence: 99%

Light absorption spectrometry

Boltz¹,

Mellon²

1968

Anal. Chem.

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Section: Simultaneous Spectrophotometric Determinationsmentioning

confidence: 99%

Light absorption spectrometry

Boltz¹,

Mellon²

1968

Anal. Chem.

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“…Finally the spectrophotometric methods are most frequently employed for the simultaneous determination of Fe, Co and Ni. Various spectrophotometric reagents have been used for this purpose (14)(15)(16). Recently a partial least-squares (PLS) multivariate calibration method in a flow system was also developed (17).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Spectrophotometric Determination of Iron, Cobalt, and Nickel by Partial Least Squares Calibration Method in Micellar Medium

Safavi

Abdollahi

2001

Analytical Letters

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The simultaneous determination of Fe, Co and Ni was carried out as 2-aminocyclo-1-pentene dithiocarboxylic acid (ACDA) complexes in the presence of an aqueous solution of cationic surfactant of cetyl trimethylammonium bromide (CTAB). The presence of micellar systems allows one to eliminate the previous solvent extraction step that is necessary for the determination of metal-ACDA complexes in the absence of micelles. This reduces the cost and toxicity of the method. A partial least-squares multivariate calibration method for the analysis of ternary mixtures of Fe, Co and Ni was developed. For individual determinations, molar absorptivities of 8.46 Â 10 3 (Fe, 650 nm), 4.76 Â 10 4 (Co, 458 nm) and 2.61 Â 10 4 (Ni, 538 nm), 2817 ORDER REPRINTS were obtained, the limit of detection being 0.11, 0.04 and 0.04 mg/ml, for Fe, Co and Ni, respectively. The total relative standard error for applying the method on 15 synthetic samples in the concentration ranges of 0.2-3.0 mg/ml Fe, 0.05-2 mg/ml Co and 0.05-2.5 mg/ml was 2.02%. The proposed method was also successfully applied to the determination of Fe, Co and Ni in several synthetic alloy solutions.

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“…However, the mentioned methods, suffer from limitations, such as a limitation of the pH, 5,10 interference from some ions, 2,[5][6][7]10,12,13 long time consuming, 2,4 low sensitivity, [7][8][9]11,13 special precautions for removing interferents, instability of the reagent solution 3 and difficult condition for complex formation (about 80˚C). 4 Among these methods, the paper reported by Malve 14 is the best. The aim of this work was to study α-benzilmonoximecobalt(II) interaction for an extractive-spectrophotometric determination of cobalt by a sensitive, rapid, selective and accurate manner which is applicable to cobalt determination in vitamins, synthetic samples and alloys.…”

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confidence: 99%