Multimedia modeling of the fate of triclosan and triclocarban in the Dongjiang River Basin, South China and comparison with field data

Abstract

Triclosan (TCS) and triclocarban (TCC) are two active ingredients widely used in many home and personal care products. Multimedia fate of TCS and TCC in the Dongjiang River basin, South China were addressed by the developed level III fugacity model based on their usage. Under the assumption of steady state, the concentrations in air, water, soil, sediment, suspended particulate matter (SPM) and fish as well as transfer flux across the interface between the compartments were simulated. The measured concentrations for the two compounds in water, SPM, and sediment from field monitoring campaigns were then compared to validate the model. The results showed that the model predicted reasonably accurate concentrations and the differences between the measured and modeled concentrations were all less than 0.7 log units. TCS and TCC had a tendency to distribute into the sediment phase, which accounted for more than 66.3% and 90.3% of the total masses, respectively. Wastewater discharge was the main source for the occurrence of the two compounds in the aquatic environment, while degradation was the primary process for the loss in the study area, followed by the advection export.Sensitivity analysis showed that the most influential parameters for the fate of the target chemicals were source term, degradation rates and adsorption coefficients. Monte Carlo simulation could well describe the modeling uncertainty and variability. Environmental impactPersonal care products are widely used in everyday life. Aer use, they are discharged into the receiving environments directly or indirectly. Their detection in the environment has become an increasing concern due to their potential impacts on the ecosystem. This paper developed a modied level III fugacity model to assess the multimedia fate of two personal care products (triclosan and triclocarban) in a river basin based on their usage data and evaluated the model by eld monitoring data in the Dongjiang River Basin. The modied steady state fugacity model can be used to evaluate contamination of personal care products at the basin scale based on their usage. This tool could be adopted by various decision-makers in the management of chemicals in river basins.

Comprehensive Evaluation of Antibiotics Emission and Fate in the River Basins of China: Source Analysis, Multimedia Modeling, and Linkage to Bacterial Resistance

“…A level-III fugacity model based on the approach of Mackay and Paterson was applied to predict the multimedia fate of the 36 antibiotics in the 58 basins. The framework as well as the transfer processes and parameters of the model are similar to that reported in our previous studies, , and the details of the model and related parameters are also described in the Supporting Information (SI-B, Tables S3–S7). Briefly, air (air, particulates), water (water, suspended solids, and fish), soil (water and solids), and sediment (water and solids) are included as bulk compartments.…”

Basin-scale emission and multimedia fate of triclosan in whole China

“…Modelling approach has provided an alternate method to solve the problem. Combining the chemical usage data, population, removal rate in WWTPs and a parameterized multimedia model describing the fate of chemicals, the chemical concentrations in the environment can be predicted, and it has been proved to be effective and accurate (Keller et al 2007;Price et al 2009Price et al , 2010aWhelan et al 2012;Zhang et al 2013). Multimedia fugacity models are well established, well documented and widely used for predicting the environmental fate of different chemicals at various scales (single river scale, regional scale and global scale) (Cao et al 2004;Mackay and Paterson 1991;Prevedouros et al 2004;Tan et al 2007;Tao et al 2003;Wang et al 2012).…”