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Spectrophotometric determination of copper(II) ion with 7-bromo-2-nitroso-1- oxinaphthalene-3,6-disulphocid

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Title Spectrophotometric determination of copper(II) ion with 7-bromo-2-nitroso-1- oxinaphthalene-3,6-disulphocid
 
Creator S, Nazirov Sh
Kh, Turaev Kh
A, Kasimov Sh
A, Normurodov B
E, Jumaeva Z
K, Nomozov A
Kh, Alimnazarov B
 
Subject Cu(II) ion
Bouguer-Lambert-Behr law
7-Bromo-2-nitroso-1-oxynaphthalene-3
6-Disulfoacid
 
Description 500-505
An organic analytical reagent reacts violently with Cu(II) ion, forming a blue water-soluble complex. A method of
spectrophotometric detection of the complex formed by Cu(II) ion with 7-bromo-2-nitroso-1-oxynaphthalene-3,6-disulfoacid
(BNOKS-S, S-3,6) (HR) reagent was developed. Optimal conditions were studied: λmax= 600, pH = 4.0, universal
buffer, reagent buffer - Cu(II) - distilled water, BNOKS-S, S-3 with 0.05% relative to TCu
2+=10 μg/25mL. It was found that
1.4 mL volume of 6 reagents is sufficient. It was determined that the area of obedience to the Bouguer-Lambert-Behr law is
0.5-15 μg/25mL. Absorption spectra were studied: sensitivity according to Sendel was 0.00092 μg/cm2, contrast Δλ = 110 nm.
The composition of the complex and the mechanism of complex formation were studied using the Nazarenko method, the
isomolar series method, Asmus' straight line method, and spectrophotometric titration methods. The molar ratio of the complex
is Me:R = 1:2. Actual molar extinction coefficient (εreal = 58824), formation equilibrium constant (Kequilb= 15.23), stability
constant of the complex using the Babko method (lgβ= 19.52), the confidence interval of the deviation from the mean value
(ΔX = 0.117) and the lower limit of detection (Qmin = 0.141 μg/25mL) were determined. The results of the graduated graph
were mathematically processed using the method of small squares and a linear mathematical equation was developed: Yi
=1,1ꞏ10–3 + 2,4ꞏ10–2Xi. The effect of foreign ions was studied. The developed method was used in an artificial mixture.
 
Date 2024-05-20T04:40:55Z
2024-05-20T04:40:55Z
2024-05
 
Type Article
 
Identifier 2583-1321 (Online); 0019-5103 (Print)
http://nopr.niscpr.res.in/handle/123456789/63916
https://doi.org/10.56042/ijc.v63i5.9289
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJC Vol.63(05) [May 2024]