. 2021 Nov 8;4:807–814. doi: 10.1016/j.crfs.2021.11.001

Table 2.

Reference and measured values (mean ± s) of three certified IAEA water samples (IAEA-B1, IAEA-B2 and IAEA-B3), and results of Student's t-test comparison.

	IAEA-B1	IAEA-B2	IAEA-B3
	Mediterranean Sea	Groundwater	Groundwater
δ¹¹B (‰)^a	37.67 ± 2.09 (n = 11)	13.59 ± 2.62 (n = 9)	−21.33 ± 0.90 (n = 10)
δ¹¹B (‰)^meas	37.00 ± 1.35 (n = 3)	14.23 ± 0.41 (n = 3)	−20.61 ± 0.14 (n = 3)
Student-test	t_cal = 0.52	t_cal = 0.41	t_cal =1.34
	t_tab(df = 12) = 2.18	t_tab(df = 10) = 2.23	t_tab(df = 11) = 2.20
	P = 0.61	P = 0.69	P = 0.21

[Gonfiantini et al., 2003].