Chlorine Henry coefficient

Use the given data to calculate the modified Henry s law coefficients, Op and Ua, for chlorine in PVC and in water at 25 C. When determining Op, plot the solubility data to make sure that the Henry s law correlation is valid, and use the method of least squares to force a fit through the origin to obtain the slope of the plot. (See Appendix A.l.)... 

To be able to assess the distribution of organic compounds among the different compartments in the environment one must have access to the solubility, vapor pressure, Henry s law constant, octanol-water partition coefficient, and pAa for an acid or base. In many cases, these values may be available in the literature and some of these sources will be cited. Government agencies often require that these physical chemical quantities be measured for compounds in commercial use. For example, pesticides cannot be registered for use without this information. So this data will be available. However, it is not unusual to hnd that compounds that are of interest are not the parent compound but a product contaminant or derivative. The most noted example of this situation would be the chlorinated dibenzodioxins originally... 

Physical-Chemical Properties of Chlorinated Dibenzo-p-dioxins Reported and experimental data for aqueous solubility, octanol-water partition coefficient, vapor pressure, and Henry s law constant are compiled and correlated with molar volumes and chlorine number. 

Environmental Chemistry and Toxicology of Polychlorinated n-Alkanes This series of compounds are produced from Cio to C30 with chlorine levels ranging from 30 to 70%. The C10-C13 series are the more important from the environmental perspective. Aqueous solubility, vapor presure, Henry s law constant, and octanol-water partition coefficient are provided along with information on degradation processes. 

Bromine s behavior in water differs from that of chlorine. It forms a hydrate, but of a different type, with approximate composition Br2-8.5H20. Hydrolysis to HOBr is not favored. Dissolved bromine is present almost exclusively as Br2, and tabulations of physical properties often express solubility in terms of the Henry s law coefficient. 

It is suggested that when assessing the environmental fate or toxicity of organic chemicals, especially those of congeneric series, such as PCBs, it is useful to gather and critically review their basic properties including solubility, vapour pressure, octanol/water partition coefficient and Henry s law constant. This approach is illustrated for three series of chemicals, the chlorobenzenes, the polychlorinated biphenyls and the chlorinated dibenzo-p-dioxins. 

Chlorinated aromatic hydrocarbons, congeneric series, chlorobenzenes (CBs), polyclorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs), solubility, vapour pressure, octanol/water partition coefficient, Henry s law constants, correlations, chlorine number, molar volume. 

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