“…5 According to the national standard of China (GB 8978-1996), the acceptable emission of phenolic compounds is 0.5 mg mL À1 (0.00454 M). 5 Up to now, numerous detection methods have been established to determine HQ, such as capillary electrophoresis, 6 uorescence, 7 gas chromatography (GC), 8,9 spectrophotometry, 10 and high performance liquid chromatography (HPLC). 11,12 These methods have the disadvantages of complicated processes, long time and high cost.…”