| Additive |
Toxic
Component |
Use |
Substitute
Material |
Chrome
Lignosulfonate/lignite |
Chromium |
Deflocculant |
Polyacrylate and/or
Polyacryamide polymer |
| Sodium chromate |
Chromium |
Corrosion control |
Sulfites, phosphonates,
and amines |
| Zinc chromate |
Chromium |
H2S control |
Non-chromium H2S scavengers |
| Lead-based pipe dope |
Lead |
Pipe thread
sealant/lubricant |
Unleaded pipe dope |
| Barite |
Cadium,
mercury,
barium,
lead |
Mud densifier |
Choose barite from sources low in cadium, mercury andlead. |
| Arsenic |
Arsenic |
Biocide |
Isothiazolins, carbamates, and gluteraldehydes |
