Level 2 Details on Dioxins 1. What are dioxins?..........................................................................................................2 1.1 What are dioxins chemically?............................................................................................2 1.2 How are dioxins formed?............................................................................................

Context: Dioxins and dioxin-like chemicals composed of 419 compounds are a large group compounds, including polychlorinated di-benzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs). extremely persistent in the environment disperse great distance from emission source, bioaccumulation food chain is one their critical properties. The incidence breast cancer among Iranian women about 30 ...

What are dioxins? The common term dioxins is often used for a number of chemically related lipophilic compounds (polychlorinated dibenzo-para dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), including certain dioxin-like polychlorinated biphenyls (PCBs) with similar toxic properties. However, the denomination of dioxin is given to 2,3,7,8-tetrachloro-dibenzo-para-dioxin (TCDD). Of the...

Over the past several years there has been concern over exposure to dioxins through the use of tampons and other sanitary products. This article describes attempts to estimate dioxin exposures from tampons and infant diapers; we then compare exposure estimates to dietary dioxin exposures. We analyzed four brands of tampons and four brands of infant diapers obtained from commercial establishment...

The term dioxins usually refers to polychlorinated dibenzo-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). As 2,3,7,8-tetrachloro-dibenzo-p-dioxin (TCDD) has the highest toxic potential, the toxic potentials of other PCDDs and PCDFs are defined in comparison with it. Human exposure to dioxins can be environmental (background), occupational, or accidental pollution. In the human body,...

Our achievements in a research project involving a case study on dioxins are presented by introducing the results. These achievements include the identification of emission sources, description of the dynamics in environmental media based on the congener-specific analysis and development of the integrated methods to evaluate and manage various types of risks due to dioxins. The risks to fetuses...

Over the last several decades, dioxins have become the subject of intense public and scientific scrutiny. This is the result of not only their widespread presence in the environment but also their great toxicity. The environmental issue has been addressed through the study of the production, release and fate of dioxins and related substances, as well as the development of analytical techniques ...

INTRODUCTION AND OBJECTIVE Despite the restrictive legal regulations related to the reduction of dioxins emission, their concentration in the environment is still too high. Mainly, this is related to the illegal utilisation of electronic equipment and combustion of wastes, and also to intensified activity and maintenance of ships, especially in developing countries. The most important remaining...

Quantum chemical calculations, based on Density Functional Theory (DFT) method, were performed on Calix[4]arene and Polychlorinated Dibenzo-p-dioxins (PCDDs) in gas and liquid phases for comparison purposes. The simulation results show the 1,2,3,4, 6,7,8,9-octachlorodibenzo-p-dioxin (OCDD) is quite a reactive dioxin. This paper attempts to examine the possibility of dioxin adsorption by Calix[n...