Environmental Aspects

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

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