mNature: the decay of animals and plants mIndustrial emissions: petrochemical, papermaking, organic reagents mAgriculture: pesticides and fertilizers mFamily: detergent, human and animal discharge mWater supply system (purification, storage, transportation system) mMicroorganism produced by water system
Because of the variety of organics, it can not be expressed as the concentration of specific or several components, but a common feature of organics is carbon containing elements. Therefore, organic pollutants in water are usually expressed as carbon content in organics.