On July 13, the European Union made an anti-dumping review of the final production of tartaric acid originating in China, raising the anti-dumping duty of Jiangsu Changmao Biochemical Engineering Co., Ltd. from 10.1% to 13.1%, and imposing anti-dumping duties on Zhejiang Ninghai Organic Chemical Factory. From 4.7% to 8.3%.

In 2004, the European Union initiated an anti-dumping investigation against tartaric acid originating in China; in 2006, the European Union made a definite final ruling on the case. In July 2011, the European Union initiated an anti-dumping investigation of tartaric acid originating in China. The investigation only targeted Jiangsu Changmao Biochemical Engineering Co., Ltd. and Zhejiang Ninghai Organic Chemical Plant.