This standard specifies the methods for the determination of various hygienic indicators in various types of tea such as green tea, black tea, and pressed tea.
GB/T 5009.57-1996 history
2016GB 5009.257-2016 Determination of Trans Fatty Acid in National Food Safety Standard Food
2003GB/T 5009.57-2003 Method for analysis of hygienic standard of tea
1996GB/T 5009.57-1996 Analytical method for hygienic standard of tea