A new, simple, accurate, fast and sensitive spectrophotometric method has been
developed for the analysis of Pyrocatechol, Resorcinol, and pyrogallolin pure
commercial samples by continuous flow injection analysis. The method was based on
the oxidation of the organic compounds with Ce(IV)sulfate in acidic medium to
formed a brown colored species which determined using homemade Ayah 3SBGR x3-
3D solar cell flow injection microphotometer. Optimum conditions were obtained
using a high intensity green light emitted diode as an irradiation source
forPyrocatechol, Resorcinol, whileblue light emitted diode as an irradiation source for
pyrogallol. The linear dynamic range for the instrument response versus Pyrocatechol,
Resorcinol, and pyrogallol concentrationswere5-40mmol.L-1 while the L.O.D was of
36.63, 17.17, and 41.61ng / sample respectively. The correlation coefficient (r) was
0.9952, 0.9970, and 0.9960 while percentage linearity (r2%) was 99.05%, 99.41% and
99.22%forPyrocatechol, Resorcinol, and pyrogallol respectively. RSD% for the
repeatability (n=8,7, and 8) was 1.4%, 0.63%, 1.78% for the determination of
Pyrocatechol, Resorcinol,andpyrogallol, respectively at concentration of 30 mmol.L-1.
The method was applied successfully for the determination of three organic
compounds in purecommercial samples. A comparison was made between the newly
developed method and the classical method (UV-Vis spectrophotometry) at wave
length 492, 481, and 438 nm forPyrocatechol, Resorcinol and pyrogallolrespectively
of analysis using the standard additions method via the use of paired t-test. It was
noticed that there is no significant difference between two different methods for
analysis three different organic compounds; in addition to no significant difference in
the contribution of the Pyrocatechol, Resorcinol and pyrogallol to the oxidant reaction
path, at 95% confidence level.
The gas sensing properties of Co3O4and Co3O4:Y nano structures were investigated. The films were synthesized using the hydrothermal method on a seeded layer. The XRD, SEM analysis and gas sensing properties were investigated for Co3O4and Co3O4:Y thin films. XRD analysis shows that all films are polycrystalline in nature, having a cubic structure, and the crystallite size is (11.7)nm for cobalt oxide and (9.3)nm for the Co3O4:10%Y. The SEM analysis of thin films obviously indicates that Co3O4possesses a nanosphere-like structure and a flower-like structure for Co3O4:Y.The sensitivity, response time and recovery time to a H2S reducing gas were tested at different operating
... Show MoreDie Zusammenfassung :
In der Forschung „ Die Wirkungen der Nachkriegliteratur „ findet man einen Überblick über die Wirkungen der Literatur im Allgemeinen und besonders über die Wirkungen der Nachkriegliteratur in Deutschland. Das Kurzgeschichte „ das Brot“ von Wolfgang Borchert „ wird in dieser Forschung als Beispiel analysiuert, weil sie die Nachteile des Kriegs und ihre Wirkungen auf die Familienbeziehungen behandelt. Die Hauptfiguren der Kurzgeschichte sind ein alter Mann und seine Frau. Der Schriftsteller bestimmt die Rolle der Frauen in Deutschland. Die Frau in dieser Geschichte ist stärker als ihren Mann , denn er war lügner und schwach.
Post-war Literature has an e
... Show Moreچکیدهی بحث
به نظر میآید که عالم هستی ، بر مسألهی « حرکت» استوار دارد ، و روح ، همیشه دنبال دگرگونی و تکامل و برتری میگردد. حرکت ، همهی چیزها در عالم إمکان را در بر میگیرد. حرکت در بنیادهای فکر مولانا جای مهمی دارد .اشعار مولانا مقدار زیادی از پویایی و حرکت برخوردارست، و از آنجایی که فعل ، عنصر تکانبخش جمله ، و کانون دلالت است ، ترجیح دادیم - علاوه بر دیگر عنا
... Show More