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Register a new userUsing 1-(2-pyridylazo)-2-naphthol (PAN) to Determination of Cobalt (II) by spectrophotometric method
استخدام كاشف1-(2-بيريديل آزو)-2-نفتول (PAN) لتحديد الكوبالت (II) بالطريقة الطيفية الضوئية
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Aِl-Baath University ورقة بحثية
Publication date
2014
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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طورت طريقة طيفية ضوئية حساسة و بسيطة للتحديد الكمي للكوبالت (II) باستخدام كاشف1-(2-بيريديل آزو)-2-نفتول (PAN), تعتمد الطريقة على تشكيل معقد أخضر اللون عند قيمة pH =4.1, أعطى المعقد قمة امتصاص أعظمي عند λmax=580nm.
A sensitive, simple, selective spectrophotometric method has been developed for determination Cobalt (II) with 1-(2-pyridylazo)-2 naphthol (PAN). This method ralies on the formation of stable red colored complex at pH=4.1 which has an absorption maximum at 580nm.
References used
(S. SHIBATA, (1972), 2-Pyridylazo Compounds in Analytical Chemistry, Marcel Dekker, (4
K. L. CHENG, R. H. BRAY, (1955), 1-(2-Pyridylazo)-2- naphthol as Possible Analytical Reagent, Analytica. Chimica. Acta, (27) 5, 782-785
S. SHIBATA, (1963), Spectrophotometric Determination of Rare Earth Metals with 1-(2-Pyridylazo)-2-naphthol, Analytical. Chimica. Acta, (28), 388
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A new carbon paste electrode (CPE) for Co2+ ion modified with
complex of Cobalt(II) with 1-(2-pyridylazo)-2-naphthol (PAN) as
electroactive 84aterial was prepared. The best performances were
obtained by carbon paste electrode with the composition Graphit
powder (47%), DOPH as plasticizer (47%) and Co-PAN as
electroactive material (6%)
A Simple, accurate and highly sensitive spectrophotometric method have been
developed for the rapid determination of Ofloxacine (OFX) in pure form and
pharmaceutical formulations. The visible spectrophotometric method was based on the
formation of
a Orange Yellow colored complex between the (OFX) and 2-amino-6-
nitrobenzothiazole (ANB) at pH 5.2 and 80±5 ºC in 5 min., and λmax at 440 nm. The
effects of analytical parameters on the reported system were investigated. Beer's law was
obeyed in the concentration range of 1.80-86.72 μg/mL, with a percentage relative standard
deviation not exceed ±2.54 and the molar absorptivity coefficients was 3.952×103
(L/mol.cm). Interferences of the other ingredients and excipients were not observed, the
results showed that the developed method with the accuracy and sensitivity highs.
The possibility of formating a colored complex between Fe2+ ions and 4-Hydroxy-3-
[[(2-hydroxy phenyl) methylene] amino] benzene Sulphonic Acid (HVMAB) was studied
spectrophotometric method for determination of iron in aqueous solutions. The reagen
t
reacts in aqueous medium at pH=5 to give an orange complex with maximum absorbance
λmax=415nm.
Simple, accurate and reliable spectrophotometric method
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pharmaceutical formulations. The method is based on the
determination of that in aqueous medium pH=6.45 at
25±0.5ºC.
A new, simple and sensitive kinetic spectrophotometric
method has been proposed for the determination of tropicamed
(TPC) in pure and pharmaceutical formulations. The method is
based on oxidation TPC by potassium permanganate in strong
alkaline m
edium (pH=12) to form green colored product with
absorbance maximum at 610nm.
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