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Elemental analysis

Mean(n=4, µg kg^-1)

Deviation(n=4,%)

mDa

ppm

MQCA

0.4

2.1

160

4.3

QCT

1.8

5.9

650

6.9

4-DQCT

2.3

7.9

880

5.2

1-DQCT

0.1

0.3

290

1.8

DQCT

0.5

1.8

9270

4.5