Spectrophotometric Determination

Spectrophotometric Determination of Some Aromatic Amines

Mon, 2014-03-31 12:34 — Nidal Zatar

Journal Title, Volume, Page:

Talanta Volume 47, Issue 4, Pages 883–890

Year of Publication:

1998

Link:

http://www.sciencedirect.com/science/article/pii/S0039914098001775

Authors:

Nidal A Zatar

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Ali Z Abu-Zuhri

Chemistry Department, An-Najah National University, Nablus, Palestine

Asma A Abu-Shaweesh

Chemistry Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A method for spectrophotometric determination of four aromatic amines is described. The method is based on the reaction between the amine and the colorless Fe(III)-ferrozine complex. The amine reduces iron from Fe(III) to Fe(II) which forms a violet colored complex with ferrozine. The method is suitable for to the determination of 1,4-phenylenediamine, 2,4-diaminotoluene, 8-aminoquinoline and 2-amino-3-hydroxypyridine. The effect of different factors such as; pH, stability of the complex, temperature, ferrozine concentration, Fe(III) concentration and methanol concentration have been studied. The composition of the complex as well as the tolerance amount of other amines have been reported. Maximum absorbance is at 562 nm and Beer's law is obeyed over the ranges 0.17–1.6 ppm for 1,4-phenylenediamine, 0.45–3.7 ppm for 2,4-diaminotoluene, 0.51–3.4 ppm for 8-aminoquinoline and 0.53–4.4 ppm for 2-amino-3-hydroxypyridine. The obtained molar absorbtivities were 4.7×10⁴, 2.0×10⁴, 1.6×10⁴, 1.5×10³ l mol⁻¹ cm⁻¹ respectively.

Emodin, A Naturally Occuring Anthraquinone: Its Isolation and Spectrophotometric Determination in Rumex Cyprius Plant

Mon, 2014-03-31 12:31 — Nidal Zatar

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 29, Issue 8

Year of Publication:

1996

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019608007144#.UzlHn_mSwgY

Authors:

Nidal A. Za'tar

Chemistry Department , An-Najah National University , Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Mohammed A. Al-Nuri

Chemistry Department , An-Najah National University , Nablus, Palestine

Maher A. Abu-Eid

Chemistry Department , An-Najah National University , Nablus, Palestine

Mohammad A. Hannoun

Chemistry Department , An-Najah National University , Nablus, Palestine

Waheed J. Al-Jondi

Chemistry Department , An-Najah National University , Nablus, Palestine

Mohammad S. Ali-Shtayeh

Biology Department , An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2–30 ppm.

The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant.

Plumbagin, a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric Determination in Roots, Stems, and Leaves in Plumbago Europaea L.

Mon, 2014-03-31 10:50 — Nidal Zatar

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 27, Issue 4, pages 409-416

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019408007247#preview

Authors:

Nidal A. Zatar

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Mohammed A. Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Maher A. Abu-Eid

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Waheed J. Al-Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Ahmad I. Hussein

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Mohammed S. Ali-Shtayeh

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus. Palestine

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pK_a value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.

Plumbagin a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric ‎Determination in Roots, Stems, and Leaves in Plumbago Europea L

Thu, 2014-03-27 14:01 — Maher An-Natsheh

Journal Title, Volume, Page:

Spectroscopy Letters, Volume 27, Issue 4, pages 409 - 416

Year of Publication:

1994

Link:

http://blogs.najah.edu/staff/nidalzatar/article/Plumbagin-a-Naturally-Occurring-...

Authors:

Maher A. Abu-Eid

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Ahmad I. Hussein

Chemistry Department, An-Najah National University, Nablus, Palestine

Nidal A. Zatar

Chemistry Department, An-Najah National University, Nablus, Palestine

Waheed J. Al-Jondi

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammed A. Al-Nuri

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammed A. Hannoun

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammed S. Ali-Shtayeh

Biology Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pKa value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.

Emodin, A Naturally Occuring Anthraquinone: Its Isolation and Spectrophotometric Determination in Rumex Cyprius Plant

Thu, 2014-03-27 10:47 — Maher An-Natsheh

Journal Title, Volume, Page:

Spectroscopy Letters, 29(8), 1539

Year of Publication:

1996

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019608007144

Authors:

Maher A. Abu-Eid

Chemistry Department , An-Najah National University , Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Mohammed A. Al-Nuri

Chemistry Department , An-Najah National University , Nablus, Palestine

Nidal A. Za'tar

Chemistry Department , An-Najah National University , Nablus, Palestine

Mohammad A. Hannoun

Chemistry Department , An-Najah National University , Nablus, Palestine

Waheed J. Al-Jondi

Chemistry Department , An-Najah National University , Nablus, Palestine

Ahmad I. Hussein

Mohammad S. Ali-Shtayeh

Biology Department , An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A new method for isolation and specrophotometric determination of emodin is presented. Emodin was isolated by thin layer chromatography (tlc) and column chromatography (cc) techniques, as an orange long crystalline substance. Emodin exhibits two absorption maxima, at 420 and 520 nm. Stability of the color and the effect of pH were studied. Beer's law is obeyed in the range 2–30 ppm.

The method is applied to the determination of emodin in roots, stems, and leaves of Rumex cyprius plant.

Some Arylidene-2-Pyridylhydrazone Derivatives as Reagents for Spectrophotometric Determination of Palladium (II)

Wed, 2014-03-26 12:46 — Maher An-Natsheh

Journal Title, Volume, Page:

Analytical Letters Volume 19, Issue 19-20

Year of Publication:

1986

Link:

http://www.tandfonline.com/doi/abs/10.1080/00032718608064533?journalCode=lanl20#...

Authors:

Maher Abu Eida

Chemistry Department, Faculty of Science, An-Najah National University, P. O. Box 7, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Nidal Zat'ara

Chemistry Department, Faculty of Science, An-Najah National University, P. O. Box 7, Nablus, Palestine

Ali Z. Abu Zuhria

Chemistry Department, Faculty of Science, An-Najah National University, P. O. Box 7, Nablus, Palestine

Foua'D Mahmouda

Chemistry Department, Faculty of Science, An-Najah National University, P. O. Box 7, Nablus, Palestine

Preferred Abstract (Original):

A method for spectrophotometric determination of palladium by complexation with Arylidene-2-pyridylhydrazone derivatives in 50% (V/V) ethanolic solution are described-Pd(II) forms a 1:1 complex with the reagents. Beer's law is obeyed over the range 0.2-6.5 μg ml⁻¹. The effect of pH, effect of excess reagent, stability of complexes as well as the tolerance amount of many metal ions have been reported. The method is applied, with fair accuracy, to the determination of pd(II) in synthetic solutions.

Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Mon, 2014-03-24 13:41 — Foad Mustafa Sabri Mahmoud

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9

Year of Publication:

1989

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018908054017#.UzAdBPmSwgY

Authors:

Foad M. Mahmoud

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Ahmad A. Abu-Obaid

Mohammad A. Al-Nuri

Ali Z. Abu- Zuhri

Nidal A. Zatar

Preferred Abstract (Original):

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

Some Arylidene-2-Pyridylhydrazone Derivatives as Reagents for Spectrophotometric Determination of Palladium (II)

Mon, 2014-03-24 11:22 — Foad Mustafa Sabri Mahmoud

Journal Title, Volume, Page:

Analytical Letters Volume 19, Issue 19-20

Year of Publication:

1986

Link:

http://www.tandfonline.com/doi/abs/10.1080/00032718608064533?journalCode=lanl20#...

Authors:

Foua'D Mahmoud

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Nidal Zat'ar

Chemistry Department, Faculty of Science, An-Najah National University, Nablus, Palestine

Ali Z. Abu Zuhri

Chemistry Department, Faculty of Science, An-Najah National University, Nablus, Palestine

Maher Abu Eid

Chemistry Department, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A method for spectrophotometric determination of palladium by complexation with Arylidene-2-pyridylhydrazone derivatives in 50% (V/V) ethanolic solution are described-Pd(II) forms a 1:1 complex with the reagents. Beer's law is obeyed over the range 0.2-6.5 μg ml⁻¹. The effect of pH, effect of excess reagent, stability of complexes as well as the tolerance amount of many metal ions have been reported. The method is applied, with fair accuracy, to the determination of pd(II) in synthetic solutions.

Spectrophotometric Determination of Trace Amounts of Mercury with 3-(2-Thiazolylazo)-2, 6-Diaminopyridine and Gelatine

Thu, 2014-03-20 10:55 — Bassem Shraydeh

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 19, Issue 8

Year of Publication:

1986

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387018608069298#.UyqxQfmSwgY

Authors:

Bassem F. Shraydeh

Chemistry Department, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, An-Najah National University, Nablus, Palestine

[email protected]

Ali Z. Abu Zuhri

Chemistry Department, An-Najah National University, Nablus, Palestine

Mohammad A. Hannoun

Chemistry Department, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

A sensitive method for the determination of trace amounts of mercury by complexation with 3-(2-Thiazolylazo)-2, 6-diaminopyridine (2, 6-TADAP) is described. Hg(II) forms a 1:2 complex with the reagent. Beer's law is obeyed over the range 5–40 μg in the total volume of 10 ml. The molar absorptivity was found to be 1.4 × 10⁴ L mol⁻¹ cm^−1. This method is simple, rapid and involves no extraction steps whereby the use of gelatine as a solubilizing agent is described.

Plumbagin, a Naturally Occurring Naphthoquinone: Its Isolation, Spectrophotometric Determination in Roots, Stems, and Leaves in Plumbago Europaea L.

Tue, 2014-02-18 12:17 — Mohammed Saleem Ali-Shtayeh

Journal Title, Volume, Page:

Spectroscopy Letters: An International Journal for Rapid Communication Volume 27, Issue 4, pages 409-416, DOI: 10.1080/00387019408007247, 1994

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/00387019408007247#preview

Authors:

Mohammed A. Al-Nuri

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Mohammed A. Hannoun

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Nidal A. Zatar

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Maher A. Abu-Eid

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Waheed J. Al-Jondi

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Ahmad I. Hussein

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus. Palestine

Mohammed S. Ali-Shtayeh

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus. Palestine

Current Affiliation:

Department of Biology and Biotechnology, Faculty of Science, An-Najah National University, Nablus. Palestine

[email protected]

Preferred Abstract (Original):

A new method for isolation and spectrophotometric determination of plumbagin is presented. Plumbagin was isolated by thin layer chromatography (TLC) and column chromatography (CC) techniques, as an orange tinged yellow long crystalline substances. Plumbagin exhibits two absrop-tion maxima at 410 and 510 nm. Stability of the color, pK_a value, and the effect of pH were studied. Beer's law is obeyed over the range 0.9-45 ppm. The method is applied to the determination of plumbagin in roots, stems, and leaves of Plumbago europaea L. plant.