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Table 1 Metal used in the industrial processes at the companies

From: Risk assessment of occupational exposure to heavy metal mixtures: a study protocol

Companies

Al

Cu

Cr

Ni

Pb

Zn

1

+

+

+

+

–

–

2

+

+

+

+

+

–

3

+

+

–

–

–

+

4

–

+

+

+

–

+

5

+

+

–

–

–

+

  1. (+): Presence of the metal, (−): Absence of the metal