Development of environmental risk assessment framework and methodology for consumer product chemicals in China.

Environmental risk assessment (ERA) methodologies for consumer product chemicals are well established in most developed regions including the United States, Canada, and the European Union. However, such methodologies are not yet fully developed for emerging economies, such as China. The objective of the present study was to develop an ERA framework involving an exposure methodology using conditions specific to China (i.e., physical setting, infrastructure, and consumers' habits and practice). Incorporated in this newly developed ERA framework for assessing consumer product chemicals were China's current regulatory screening and prioritization schemes as part of a tiered risk assessment approach. The framework started with tier 0, which utilized the existing Chinese regulatory qualitative method; tiers 1 and 2 were quantitative, and used deterministic and probabilistic methods that accounted for per capita residential water usage, wastewater treatment capability, and wastewater/in-stream dilution factors. Due to major differences in wastewater treatment infrastructure and water usage between urban versus rural regions in China, 2 scenarios were identified for quantitatively assessing environmental exposure: 1) urban with wastewater treatment, and 2) rural without wastewater treatment (i.e., direct discharge of wastewater). Our study presents the methodology of the framework with its technical rationale and the companion model Chera, and also provides an overview of the current status of ERA research in China. Environ Toxicol Chem 2019;38:250-261. © 2018 SETAC.