Air: Dust emissions from approved manufacturing plant must not exceed a total mass flow of 5 g h-1 or a mass concentration of 1 mg m-3 for the sum of lead and chromium (TA-Luft) [3.141].
Water: According to latest German wastewater legislation [3.142] for inorganic pigment manufacturing processes discharging directly into public streams ofwater, mass limits for lead and chromium related to approved tonnes of annual production capacity (tprod) are:
Lead 0.04 kg/tpTOd
Chromium (total) 0.03 kg/tprod
Fish toxicity dilution index 2
Local or regional authorities, even for “non-direct” discharges into municipal sewer systems, might set lower limits.
In Germany lead chromate and lead chromate pigments are assigned to Water Hazard Class (WGK): 2 (hazardous to water) [3.143], resulting in handling and storage restrictions and requirements on leak tightness. The European Community considers lead chromate and lead chromate pigments as “Very toxic to aquatic organisms” [3.144].
Waste: Waste containing lead chromate pigments that cannot be recycled must be taken to a special waste disposal site under proper control.
3.4.5.3