Organic Chemical Constituents from Industrial Pollution (with health significance)
Constituent Sources
Benzene Benzene may be introduced into water by industrial effluents and atmospheric pollution due to vehicular emissions.
Carbon Tetrachloride From industrial discharges, carbon tetrachloride levels in anaerobic groundwater may remain elevated for months or even years.
1,2-Dichlorobenzene DCBs are widely used in industry and in domestic products such as odor-masking agents, chemical dyestuffs and pesticides
1,2-Dichloroethane Used as an intermediate in the production of vinyl chloride and other chemicals and as a solvent.
1,1-Dichloroethene Used as monomer in the production of polyvinylidene chloride co-polymers and as an intermediate in synthesis of other organic chemicals.
1,2-Dichloroethene Its presence appears as metabolites of other unsaturated halogenated hydrocarbons in wastewater and anaerobic groundwater, which may indicate the simultaneous presence of more toxic organochlorine chemicals such as vinyl chloride.
Dichloromethane Dichloromethane or methylene chloride is widely used as a solvent for many purposes including coffee decaffeination and paint stripping.
Di(2-ethylhexyl) phthalate Used mainly as a plasticizer.
Edetic Acid (EDTA) Maximum value of 0.6 mg/L for EDTA as the free acid.
Ethylbenzene Primary sources are petroleum industry and use of petroleum products.
Nitrilotriacetic acid (NTA) Used primarily in laundry detergents as a replacement for phosphates and in the treatment of boiler water to prevent accumulation of mineral scale.
Polynuclear aromatic hydrocarbons (PAHs) Used as coal-tar coating in drinking-water distribution pipes
Styrene Used in the production of plastics and resins
Tetrachloroethene Used as solvent in dry cleaning industries and as a metal degreasing solvent.
Toluene Used in the blending of petrol, as a solvent and as a raw material in chemical production. It may penetrate plastic pipes from contaminated soil.
Trichloroethene Used in dry cleaning and metal degreasing processes. Trichloroethene in anaerobic groundwater may degrade to more toxic compounds, including vinyl chloride.
Vinyl chloride Used primarily for production of PVC.
Xylene Used in blending petrol, as a solvent and as a chemical intermediate.

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