Development of an analytical method for simultaneously determining TBBPA and HBCDs in various foods

•A method was developed to analyze TBBPA and HBCDs simultaneously in foods.•ASE and ASC were the most efficient ways to extract the lipids from foods.•The main uncertainty contributor stemmed from intermediate precision.•Mackerels containing high level of fat were highly contaminated by TBBPA and HBCDs. Tetrabromobisphenol A (TBBPA) and Hexabromocyclododecanes (HBCDs) are commonly used as brominated flame retardants in large volumes, and accumulate in plants and animals in the environment, and people are exposed to them when consuming food. As many countries are monitoring them in food, it is necessary to develop a method to analyze them simultaneously for cost efficiency. A method was developed and optimized under different conditions using accelerated solvent extraction to extract the lipids from the samples, acid silica column to clean the samples and liquid chromatography coupled with tandem mass spectrometry to determine TBBPA and HBCDs. The method was validated in different kinds of food. Uncertainty of measurement was calculated by combining all uncertainties of contributors. Intermediate precision (reproducibility) was the most influential contributor to uncertainty. 5 food categories with 115 samples were analyzed with the method, and mackerels containing high level of fat were highly contaminated by TBBPA and HBCDs.