Determination of heavy metals in the soils of tea plantations and in fresh and processed tea leaves: an evaluation of six digestion methods

Table 4 Level of Cd, Pb, As and Se (µg/g) in tea leaves from various countries

Country	Cd	Cr	Pb	As	Se
Bangladesh	0.02 [34]	32.87 [34]	0.34 [34]	NA	ND [34]
India	0.43 [37] 0.59–0.77 [50] 0.01–0.03 [51]	0.09–0.37 [39] 1.28–1.84 [50] 0.43–1.14 [51]	1.86 [37] 0.98–1.83 [50] 0.10–0.51 [51]	NA	0.05–0.07 [39] 2.12–2.47 [51]
China	0.77 [37] 0.043 [52] 0.04–0.08 [51]	0.07–0.37 [39] 1.23–2.20 [51]	1.49 [37] 0.86 [52] 0.60–1.08 [51]	0.28 [41]	0.05–0.09 [39] 2.55–3.97 [51]
Japan	0.15 [37]	0.11–0.24 [39]	1.55 [37]	NA	0.05–0.09 [39]
Italy	0.09–0.17 [37] 0.04 [51]	1.31 [51]	0.19–0.52 [37] 0.55 [51]	NA	2.65 [51]
Turkey	0.7–0.9 [22, 28]	3.1–3.5 [22, 28]	3.1–3.7 [22, 28]	NA
Thailand	0.001–0.086 [38]	0.040–3.294 [38]	0.108–22.245 [38]	0.013 [38] 0.010–0.238 [53]	0.00–0.01 [38] 0.014–0.508 [53]
Sri Lanka	0.03–0.24	0.05–0.11 [39]	0.59 [34]		0.05–0.09 [39] ND [34]
Iran	0.76 [50] 134.5 [54]	0.89–1.79 [50] 8.2 [54]	0.92–2.92 [50] 209.5 [54]	0.28–0.56 [41]	NA

ISSN: 2661-801X