Wedad H. Al-Dahhan

Al-Nahrain University · Department of Chemistry

The photodegradation of a poly(vinyl chloride) (PVC) film filled with Schiff bases in its structure was investigated and studied by comparing it with a blank PVC film. A PVC film containing novel Schiff's bases was synthesized and used as a photostabilizer for PVC. PVC was exposed to ultraviolet light and underwent harmful changes, where the photos...

Four valsartan of organotin(IV) complexes [Ph3SnL, Ph2SnL2, Bu3SnL and Bu2SnL2] have been synthesized, characterized and used as photo-stabilizes for polyvinyl chloride in previous research. The PVC films doped with the complexes at a concentration of 0.5% by weight. The PVC films irradiated at wavelength 313 nm at room temperature for up to 300 h....

We synthesized and designed four new modified poly(vinyl chloride) structures to develop various polymer derivatives to enhance their photo-stability. Commercially available poly(vinyl chloride) was synthetically modified into a polymer containing aromatic Schiff base moieties. First, the PVC polymer was reacted with ethylene diamine from one side...

Since its first discovery in the nineteenth century, polymer researchers have continued to study poly(vinyl chloride). Its characteristics, such as its thermal instability, are delicate by its structural flaws that result from its containing chlorine atom which is sensitive to UV light as a good leaving group. Many researchers suggested adding vari...

Background: When oxygen is mentioned, we think of air that we inhale. However, oxygen that is used for medical purposes and treatments should be highly pure (> 99.5 %). Materials and Methods: Medical oxygen can be used for oxygen therapy, anesthetics, resuscitation, and life support. Using excess oxygen could cause several side effects, including n...

Heavy metals can be considered in the aquatic environment as natural archaeological components and their quantities have risen as a result of industrial pollution. Heavy metals do not degrade over time and their concentrations can only rise due to bioaccumulation unlike organic contaminants. In the recent period, fish consumption has increased sign...

Heavy metals (HMs) in meat commonly are lead, cadmium, mercury, nickel, copper, iron, and zinc. Most of these HMs are dangerous because of their susceptibility to dissolve in water; yet, there is no reliable mechanism to remove them from the body. This article aims to determine the heavy metals and their levels in some imported meat brands availabl...

Tobacco smoke contains more than 3,800 different compounds, where all could harm the exposed humans to different degrees. Among them, nicotine (3-(1-methyl-2-pyrrolidinyl) pyridine) is considered the most toxic compound. In many countries, tobacco smoking is considered a severe health hazard and a significant factor in death and several common dise...

Tetra Schiff bases were used as thermal stabilizers to enhance the properties of polyvinyl chloride (PVC) when operated at high temperatures. The thermal stability of PVC films doped with Schiff bases was tested by the weight-loss method, Fourier transform infrared (FTIR) spectroscopy, thermal aging test, optical microscope, and atomic force micros...

Coronavirus disease 2019 (COVID-19) is an infectious disease affecting the respiratory system, which has had an unprecedented effect on healthcare systems globally with severe impact on specialist services. In December 2019, a novel coronavirus strain (CoV) was detected in Wuhan, China. By January 2020, It named as 2019 novel coronavirus (2019-nCoV...

Coronavirus disease 2019 (COVID-19) is an infectious disease affecting the respiratory system, which has had an unprecedented effect on healthcare systems globally with severe impact on specialist services. In December 2019, a novel coronavirus strain (CoV) was detected in Wuhan, China. By January 2020, It named as 2019 novel coronavirus (2019-nCoV...

Chemistry laboratories in colleges or research centres in Iraqi universities are been widely used by both undergraduate and postgraduate students. Those institutes worked actively in reporting lab accidents and applying various procedures to improve the safety measures at these sites. In addition to many workshops was carried out to raise the aware...

Chemistry laboratories present more hazards than are typically found in other science laboratories. The Department of Chemistry at the College of Science at Al-Nahrain University aims to establish and develop the concepts of occupational safety and its embodiment through an applied reality aimed at making the work environment safe considering the d...

Teaching and research laboratory staff members are continuously and hardly working to report any incident took place in their facilities. Furthermore, these incidents have been extensively investigated in depth with explicit report of the potential reasons for these incidents as well as suggesting feasible precautions to avoid them in the future. H...

The Department of Chemical and Biological Engineering, Al-Khwarizmi College of Engineering at Baghdad University has lately renovated its own research laboratories to comply with international safety measures and conduct undergraduate and postgraduate research. In this regard, the department has harnessed some amenities within the college to establ...

4-amino-5-(pyridyl)-4H-1,2,4-triazole-3-thiol (X) with Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ and Sn 2+ has been synthesized also used as PS photostabilizers. In chloroform solvent, these complexes mixed with PSto form modified PS, which involving (0.5%wt)of complexeswere prepared usingcasting method. At room temperature the intensity of light (6.02×10-9Ein...

The department of Chemistry is one of the main academic departments in the College of Science at Al-Nahrain University. The department awards Bachelor degree in Chemistry and Master degree in Analytical, Physical, Organic, Inorganic, and Biochemistry. Chemistry department since its establishment has twenty one laboratories within. Fifteen of them a...

Al-Mishraq sulfur mine (25 miles to the north of Qayyarah in Mosul province, Iraq) has been considered as the largest sulfur mine in the world. The site has caused two catastrophic events in 2003 and 2016 due to combustion of elemental. sulfur. The release of about 600 k tons of sulfur dioxide. (SO2) led to the formation. of the largest. non-volcan...

The department of Chemistry is one of the main academic departments in the College of Science at Al-Nahrain University. The department awards Bachelor degree in Chemistry and Master degree in Analytical, Physical, Organic, Inorganic, and Biochemistry. Chemistry department since its establishment has twenty one laboratories within. Fifteen of them a...

The Department of Chemical and Biological Engineering, Al-Khwarizmi College of Engineering at Baghdad University has lately renovated its own research laboratories to comply with international safety measures and conduct undergraduate and postgraduate research. In this regard, the department has harnessed some amenities within the college to establ...

Chemistry laboratories have been classified as dangerous workplaces as many hazardous chemicals are used within. Some of these chemicals have a high risk score and dealing with them without taking into considerations any potential damage to properties/people is absolutely unprofessional and irresponsible. In this regard, in order to offer a reasona...

The forensic DNA facility at Al-Nahrain University was established in 2011 with a clear message to be as a training and research center in Iraq. Iraq is still suffering from the existence of many mass graves in different provinces, and complicated criminal cases. Predominantly, the forensic DNA facility will offer a solid platform to support forens...

There is no doubt that laboratories are extremely dangerous places as many hazardous materials are dealt with. It is mandatory to take safety precautions in laboratories at all times with no excuses. Herein, we report an incident took place in a research laboratory at Department of Chemistry Al-Nahrain University as a result of dealing with some ch...

Scientists at universities throughout Iraq are actively reporting incidents and actual incidents occurring in their labs, as well as structural improvements that have been made to improve safety and security, raise awareness and encourage openness, leading to widespread adoption of Chemical Safety and Security (CSS) practices. The enhancement of st...

The improvement of students’ awareness of concepts in science and its uses, practical scientific abilities and considerate of how science and scientists effort in laboratory experiences have been considered key aspects of education in science for over 100 years. Facility requirements for the necessary level of safety and security combined with spec...

Scientists at universities across Iraq are actively working to report actual incidents and accidents occurring in their laboratories in order to raise awareness and encourage openness, leading to widespread adoption of robust Chemical Safety and Security (CSS) practices. In this study, we describe a serious event that resulted in a postgraduate stu...

Scientists at universities across Iraq are actively working to report actual incidents and accidents occurring in their laboratories, as well as structural improvements made to improve safety and security, to raise awareness and encourage openness, leading to widespread adoption of robust Chemical Safety and Security (CSS) practices. This manuscrip...

Geochemical exploration processes were applied to characterize, analyze, identify, and correlate, 11 crude oils and five source rock samples (core and cuttings), which were recovered from oil exploratory wells within the Mesopotamian basin; this basin is considered as one of the most formative, potential, and promising basin in the Middle East. Rem...

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Hydrofluoric acid has been one of the important chemicals in the industry. In Iraq, there is a considerable consumption of it in petrochemicals and detergents industry. However, so far, there is no genuine evaluation for the hazards and any prospective procedures to minimise the risk of it. In this regard, we show here some accidents took place in...

Films of Poly (vinyl chloride) (PVC) doped with different concentration of nanosize zinc oxide (ZnO) (1-20) what% have been prepared using the casting method at room temperature. Optical properties were investigated by spectrophotometric measurement of absorption, reflection and transmission in the wavelength range (200-800) nm from computerized UV...