In the research and development of new organic pigments, they should not only consider the nature of their technology and application, but should also examine and pay attention to their impact on the environment, ecology and human beings. Today's pigment industry should be the toxicity of pigments and the ecological impact as an important research content. Let's take a look at various toxic hazards introduced organic pigments.
1. Ecological impact
Because pigments are insoluble in water and insoluble in other common solvents, the ecological impact of pigments is primarily the responsibility of manufacturers and processors. This effect mainly comes from the emissions of waste gas and waste water.
Organic pigments will produce dust pollution, organic pigment dust concentration in the air does not allow more than 6mg / m3, production can be purified by filtration and discharge. In the pigment production, grinding, dispersion and compounding, should pay attention to pigment dust pollution. In order to prevent the possible contact of pigment dust, necessary protective equipment must be worn.
Pigments in the production process effluent discharge often contain carcinogenic substances (such as aromatic amine, nitrite), by filtration, sedimentation and other methods of purification. Biological treatment may be used if necessary. The water discharged should be non-toxic to the fish, at least without conclusive evidence of harm.
Toxicity studies cover many areas, including the following: acute toxicity, irritation of the skin and mucous membranes, sub-acute toxicity, allergy, mutagenicity, chronic toxicity and carcinogenicity in constant contact with use.
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