T-suppression due to R=Pr,Nd,Eu in (La1−xRx)1.82Sr0.18CuO4

Arai, Jun; Umezawa, Keitaro; Iwata, Yasuo

doi:10.1007/bf02562831

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2001

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“…The analytical application of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br PADAP) as chelat-ing agent has been extensively studied in previous works. Although it can be used for the spectrophotometric determination of many rare-earth elements [6][7][8], it has not been employed for the multicomponent analysis of rare-earth and transition elements in superconductors.…”

Section: Introductionmentioning

confidence: 99%

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Camiña

2001

Journal of Analytical Chemistry

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A spectrophotometric method for the simultaneous determination of rare-earth and transition elements in synthetic superconductors, [(La 1 -x Eu x ) 1.82 Sr 0.18 CuO 4 ] , by the use of 2-(5-bromo-2-pyridylazo)-5diethylaminophenol (5-Br-PADAP) as chelating agent was developed. The influence of chemical variables affecting the reaction was studied. A partial least-squares (PLS) multivariate calibration procedure was used to assess the data obtained from several calibration solutions measured over the wavelengths range 400-700 nm. The concentration range for Cu was (1-12) × 10 -6 mol/L, while the range for the rare-earth elements La and Eu was (2-8) × 10 -6 mol/L. The relative errors in the determinations were less than 5% in most cases.

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Section: Introductionmentioning

confidence: 99%

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Camiña

2001

Journal of Analytical Chemistry

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T-suppression due to R=Pr,Nd,Eu in (La1−xRx)1.82Sr0.18CuO4

Cited by 1 publication

References 3 publications

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