Detection of the optimal analytical conditions for the determination of the copper ion using potentiometric titration

The objective of this study is to study some of the optimal analytical conditions for the determination of the Cu2+ ion using potentiometric titration method using the platinum electrode as a working electrode and the AgCL/Ag as a Reference electrode. In this study, the technical conditions were studied (working Electrode type, Reference Electrode type, Direction of titration, delay time, Proportional band, Speed of stirring) and the analytical conditions (pH value, time factor, quantity of solid KI added, electrolyte type and its concentration, detection limit) were studied using oxidation - reduction reactions as the method of iodide titration which applied successfully electrochemical for determine the Cu2+ ion.

Quality and competence Assurance of testing and calibration laboratories according to the international standards

The ISO/IEC17025 International Standard for Quality and competence Assurance for ISO/IEC Test and Calibration Laboratories have been previously known as the ISO Guide 25, but the current standard is ISO /IEC 17025: 2005.

تطبيق المواصفة ISO/IEC 17025:2005 الخاصة بمختبرات القياس و المعايرة في المخابر السورية

تم في هذا البحث دراسة الواقع الفعلي لأسلوب العمل المطبق في المخابر في بعض الجامعات السورية و مقارنته مع متطلبات المواصفة القياسية 2005 :I SO/IEC 17025لعمل على تطوير أساليب العمل تماشيا مع المواصفة.

Determination of the neutrino mass through the study of the energy spectrum of radiation of Strontium-90 isotope

In this work, using a scintillation detector with Strontium-90 source as a try to measure the electronic neutrino mass from a simple technique and different from what is used in this area where current techniques used are very complex and require substantial amounts. Also, detector calibration (to find the straight calibration equation), in addition to identified the maximum energy of β- particles (electrons), experimentally, by selection the channel number and then finding the energy value from the calibration equation (as a straight line). We have studied the disintegration changed energy with absorbent material which is an aluminum slices that have different thickness. We have observed the decrease in the values of the maximum energy of the electrons with increases the thickness of the slices. The energy changes with thickness as: E = f (x), (a straight line have a negative inclination). Applying Fermi 's theory and Kurie's plot allowed to find the maximum energy of disintegration electrons (1697,58 keV), this value is so close to experimental value (1653,45 keV), with dubity (2,6%) We have found that the electronic mass neutrino mass is almost to be non-existent, or we can said that the Strontium-90 disintegration does not allow to measure mass neutrino mass accurately, this is due to the high value of the disintegration energy of the Strontium- 90 isotope.

Study of the Upper Ordovician - Current Time tectonic evolution of the Elward Area in the Syrian Euphrates Graben Using restoration techniques

The inclined shear restoration technique was used in this research as the primary method to remove the effects of fault displacements. These displacements were resulted from the impact of the NE-SW trending extensional forces. The inclined shear restoration technique was applied to the NE-SW trending seismic section (Inline A2157) along the Elward Area, using 2D move software. The vertical shear restoration technique was used as a complementary method to remove the effects of folding associated with faulting, especially to formations under the Base Upper Cretaceous Unconformity (BKU). The inclined shear and the vertical shear restoration techniques contrib uted to build many geological sections according to depth seismic section (Inline A 2157). These sections showed the Tectonic setting of the study area from Upper Ordovician till current time.

Evaluation of the Potentiometric Titration Used to determinate arsenic)III( in mixed and aqueous media comparing with Atomic Absorption Method

This study aims to compare the results of two methods ,used to determinate arsenic in mixed and aqueous media: proposed potintiometrc titration and referenced atomic absorption and then applied the proposed method to some environmental samples. In this paper, Arsenic)III( has been titrated with iodine in aqueous and mixed media using the direct method and platinum electrode after choosing optimal technical and analytical conditions. The atomic absorption, which is often used to determine the arsenic in many applications, has been chosen as comparison guide, where the reaction take place between sodium borate (NaBH4) and arsenic Acid H3AsO3 to produce the effective compound AsH3 used to determine arsenic by this instrument . Different statistical treatments were used to evaluate the result of the determination of arsenic in desired media. The result of this investigation suggest that , it’s highly recommend to use the proposed method for its high efficiency, ease, simplicity and low cost comparing with atomic absorption technique that requires expensive equipment

Analytical and experimental study of the effect of noise background on the radioactivity measurement

In this experimental work, the instruments used (detector, calibrating sources) has been calibrating, the calibration line of the detector deduced and it has been finding that the equation of calibration line takes the form: The resolution power R has been studying as function of the distance between the activity source and detector; the results obtained show that R decrease by increase the energy of the lines spectrum, this mean that the detector resolution power become bigger. It has been measured the LC، LD and MDA using two different methods of background radiation value, trapezium method and classical method, for two different distances between radioactivity source and detector: (9,3cm) and (10cm). The results show: 1- There is similar comportment of the LC، LD and MDA in function energy and the distance between radioactivity source and detector. 2- The trapezium method gives better results from the classical method to the radiation background, and this leads to lesser MDA value, this means that the sensibility is bigger to measure this quantity. 3- The relative error using MDA is (5%) for large values, and (10%) for small values

The effect of the proportion of the media (water _ alcohol ) to determine arsenic Using a Potentiometric method

This research study the effect of the proportion of the media (water - alcohol ) to determine where the arsenic used alcohol ( methanol _ ethanol _ propanol ) Using a Potentiometric method. It conducted the calibration process for the specific size of the solution studied a specific size of the standard solution of iodine Using a Potentiometric method , after the application of analytical conditions and technical optimal to determine arsenic , and then we studied the effect of mixing ratio on the detection limit for arsenic in mixed media (water _ Alcohol ) . The study showed that the value of the detection limit of arsenic vary with the type of alcohol used and accounted for in the reaction medium , it reached to (1× 10-7 M) in media (75:25 water _ methanol ) , but when you use a media ( 75:25 water _ ethanol ) arrived to the limit of detection (1×10-4 M ), As for propanol arrived to the limit of detection (1×10-3 M). where the value reached detection limit of arsenic to (1× 10-5 M) in media ( 50:50 water _ methanol ) , but when you use a media ( 50:50 water _ ethanol ) arrived to the limit of detection (1×10-3 M ), As for propanol arrived to the limit of detection (1×10-2 M). The study showed that the use of the ratio ( 75:25 water _ alcohol ) gave a higher value limit of detection and therefore better results . Was calculated as the standard deviation and standard deviation percentile confidence limit in addition to the feedback that indicates the efficiency of the method of determining the concentration of arsenic detection limit for each medium.

Analytical and experimental study of the mechanisms of computing and measuring the radioactivity of the radioactive sources

In this work, we have used the basic techniques for measuring gamma rays. It is based on the use of a sodium iodide (NaI) detector withthallium activated (Tl). We have obtained:  The detector calibration NaI(Tl) and the resolution of the spectrometer.  Measuring and determining the activity of a source can be doneby using the relative, and the absolute method. The results obtained show bythe Comparison between the experimental and the theoretical(of the sources activities)a good agreement, and the best values obtained by the absolute method.

Choose the optimal conditions to determine arsenic in mixed media (water _ alcohol) Using a Potentiometric method

This research aims to study the effect of certain analytical conditions to determine the arsenic in in mixed media (water _ alcohol ) where the user either alcohol ( methanol, ethanol , propanol using a Potentiometric, and then selected as conditions optimal certified for this determine. The effect of each of the (PH value, type, concentration electrolyte, effect of crippling electrolytes) to determine the arsenic in mixed media ( 50:50 water _ alcohol ) and calibration using a standard solution of iodine.In addition to that, there are technical conditions must be tuned to determine the actual value of the end point calibration and data processing of standard solution (initial velocity and deceleration near the end point calibration). The study showed that the PH value appropriate for calibration of arsenic with iodine (pH=8), also found that the response process of arsenic on the electrode platinum has been excellent when using NaHCO3 as electrolyte with concentration of 1 M, which has been successfully used to quantify arsenic As+3, where the value reached detection limit of arsenic to (1×10-5M) in media (50:50water _ methanol ) , but when you use a media ( 50:50 water _ ethanol ) arrived to the limit of detection (1×10-3 M ), As for propanol arrived to the limit of detection (1×10-2 M). Was calculated as the standard deviation and standard deviation percentile confidence limit in addition to the feedback that indicates the efficiency of the method of determining the concentration of arsenic and detection limit for each medium.