T/GDOAA 0021-2023 Selenium-rich tea leaves

Scope

Scope: This standard specifies the terms and definitions, technical requirements, test methods, inspection rules, marking, packaging, storage, transportation, and requirements for the identification and use of marks for selenium-enriched tea. This standard applies to the production and sale of selenium-enriched tea products. Main technical content: Studies show that when comparing the total selenium content, organic selenium content, and selenium dissolution rate in tea soup between artificially selenium-enriched tea and naturally selenium-enriched tea, the average organic selenium accounted for 81.6% to 92.8% of the total selenium content in artificially selenium-enriched tea, indicating that the proportion of organic selenium in naturally selenium-enriched tea is 10% higher than that in artificially selenium-enriched tea. The average selenium dissolution rate in tea soup after soaking artificially selenium-enriched tea is 33.8%, while the average selenium dissolution rate in tea soup after soaking naturally selenium-enriched tea is 14.0%. This shows that the average selenium dissolution rate in tea soup after soaking artificially selenium-enriched tea is 2.4 times that of naturally selenium-enriched tea, indicating that artificially selenium-enriched tea is more easily soluble than naturally selenium-enriched tea, which coincides with the fact that inorganic valence states such as sodium selenite are more easily soluble in water than organic valence states.

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