Table 1.

OTA concentrations above LOQ of dark tea samples from different regions and years.

No.	Year	Region	Type	Concentration (μg/kg)
GX38	2016	Guangxi	Liupao tea	4.59 ± 3.02
HN2	2019	Hunan	Dark tea	9.75 ± 1.65
HB10	2000	Hunan	Dark tea	2.63 ± 0.67
HB13	2015	Hunan	Fu brick tea	6.80 ± 0.59
HN16	2014	Hunan	Tianjian tea	3.92 ± 0.49
HN17	2017	Hunan	Qing brick tea	2.79 ± 0.61
HN22	2018	Hunan	Fu brick tea	4.72 ± 0.24
HN24	2012	Hunan	Fu brick tea	2.76 ± 0.36
SC9	2014	Sichuan	Kang brick tea	4.61 ± 0.70
SC12	2016	Sichuan	Jinjian tea	5.38 ± 2.47
SC13	2016	Sichuan	Kang brick tea	9.83 ± 1.54
SC15	2018	Sichuan	Kang brick tea	7.60 ± 1.00
SC18	2014	Sichuan	Jinjian tea	5.75 ± 2.01
SC24	2017	Sichuan	Kang brick tea	3.90 ± 0.12
SC30	2015	Sichuan	Kang brick tea	4.55 ± 0.62
SC36	2017	Sichuan	Dark tea	7.74 ± 0.94
SC38	2021	Sichuan	Dark tea	5.36 ± 0.29
SC39	2021	Sichuan	Kang brick tea	12.62 ± 0.72
SC44	2021	Sichuan	Tibetan tea	5.61 ± 2.88
SX1	2018	Shannxi	Fu brick tea	3.52 ± 0.07
YN30	2020	Yunnan	Ripe Pu-erh tea	2.51 ± 0.16