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Table 5 Heavy metal contents in processed tea leaves (PTL, black tea)

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

PTL-1

0.16 ± 0.0013

9.31 ± 0.0493

0.27 ± 0.0008

1.90 ± 0.0006

1.44 ± 0.0038

PTL-2

0.10 ± 0.0031

7.03 ± 0.0156

0.70 ± 0.0004

BDL

BDL

PTL-3

0.12 ± 0.0023

10.73 ± 0.0348

0.40 ± 0.0009

1.17 ± 0.0153

0.80 ± 0.0002

PTL-4

0.04 ± 0.0030

2.10 ± 0.0004

0.07 ± 0.0021

1.40 ± 0.0036

0.76 ± 0.0023

PTL-5

0.06 ± 0.0031

1.71 ± 0.0032

0.31 ± 0.0008

0.89 ± 0.0017

BDL

PTL-6

0.11 ± 0.0030

0.45 ± 0.0026

0.22 ± 0.0006

1.78 ± 0.0066

10.79 ± 0.0065

PTL-7

0.05 ± 0.0001

2.75 ± 0.0086

0.66 ± 0.0002

1.02 ± 0.0030

0.44 ± 0.0003

PTL-8

0.07 ± 0.0004

1.19 ± 0.0084

1.03 ± 0.0011

1.16 ± 0.0006

BDL

PTL-9

0.05 ± 0.0035

BDL

0.72 ± 0.0006

1.00 ± 0.0060

1.89 ± 0.0101

PTL-10

0.07 ± 0.0020

0.54 ± 0.0049

BDL

1.30 ± 0.0004

0.21 ± 0.0016

Mean

0.083

3.581

0.438

1.162

1.633

  1. The limit of detection were 0.0045, 0.003, 0.0028, 0.0032 and 0.0064 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
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BMC Chemistry

ISSN: 2661-801X

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