PARENT SESSION

PM07 Pollutant Chemistry Transport, Cycling and Fate
Exhibit Hall
8:00 AM - Monday

(PM096) Determination of physicochemical properties of tetrabromobisphenol A and its environmental partitioning characteristics.

Kuramochi, H¹, Miyazaki, K², Nagahama, K², Maeda, K³, Li, XW⁴, Shibata, E⁵, Nakamura, T⁵, Kawamoto, K¹, ¹ National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan² Tokyo Metropolitan University, Hachioji, Tokyo, Japan³ University of Hyogo, Himeji, Hyogo, Japan⁴ Baoshan Iron & Steel Co Ltd, Baoshan, Shanghai, China⁵ Tohoku University, Sendai, Miyagi, Japan

ABSTRACT- Tetrabromobisphenol A (TBBP-A) used as a brominated flame retardant is widely spread in the environment via many household electrical products and their wastes. Unfortunately, some toxic effects of TBBP-A are reported in early works. The physicochemical properties (aqueous solubility (S_w), 1-octanol/water partition coefficient (K_ow), vapor pressure (p^o_i) and Henry's Law constant (H_w)) of TBBP-A are of fundamental importance in understanding the distribution of TBBP-A in the environment and predicting the chemical fate. However, there is little experimental data available on such properties and their temperature dependence. In this study, first, S_w and K_ow of the nonionic form of TBBP-A were measured by the generator column method. The experimental temperature for S_w measurement ranged from 283 to 308 K to enable the experimental data to be used for the environment assessment or chemical fate. Next, the p^o_i measurements at various temperatures were performed using the Knudsen effusion method. To derive H_w from the obtained physicochemical properties, furthermore, the activity coefficient of TBBP-A in water (_w) was determined from the S_w value by measuring the enthalpy of fusion and melting point for TBBP-A with a differential scanning calorimeter. On the basis of the _w and p^o_i values, H_w was calculated. We compared these physicochemical property data with those of other brominated aromatic compounds such as brominated phenols and benzenes, and also predicted the effects of pH on S_w, K_ow and H_w. From these comparisons and predictions, the environmental partitioning characteristics of TBBP-A were discussed.

Key words: Solubility, Tetrabromobisphenol A, 1-Octanol/water partition coefficient, Vapor pressure