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Table 6 Heavy metal contents in soils from tea plantations (STP)

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

Sample ID

Mean ± SD (µg/g)

Cd

Cr

Pb

As

Se

STP-1

0.16 ± 0.0013

BDL

66.54 ± 0.5200

BDL

BDL

STP-2

0.15 ± 0.0042

BDL

10.65 ± 0.0120

2.75 ± 0.0013

BDL

STP-3

0.34 ± 0.0019

BDL

63.63 ± 4.2400

1.13 ± 0.0041

BDL

STP-4

0.24 ± 0.0016

BDL

8.65 ± 0.0420

4.49 ± 0.0128

BDL

STP-5

0.22 ± 0.0021

BDL

11.86 ± 0.0660

1.79 ± 0.0017

BDL

STP-6

0.45 ± 0.0015

BDL

6.90 ± 0.2000

2.32 ± 0.0022

BDL

STP-7

0.16 ± 0.0038

BDL

2.80 ± 0.0100

1.08 ± 0.0117

0.03 ± 0.0003

STP-8

0.23 ± 0.0015

BDL

9.48 ± 0.0260

3.03 ± 0.0004

BDL

STP-9

0.16 ± 0.0011

BDL

3.60 ± 0.0350

BDL

0.99 ± 0.0000

STP-10

0.11 ± 0.0059

BDL

10.22 ± 0.4400

0.78 ± 0.0157

0.81 ± 0.0032

Mean

0.222

–

19.433

1.737

0.183

  1. The limit of detection were 0.036, 0.0018, 0.0093, 0.0051 and 0.0012 µg/g for Cd, Cr, Pb, As and Se, respectively. The data (µg/g) shown in Table is reported on dry weight basis
  2. n = 3 (n no. of analyses), SD standard deviation, BDL below detection limit