Since the invention of Ductile Iron, also known as Spheroidal Graphite Iron or Nodular Cast Iron in 1949, it has become the most preferred pipe material for water supply and pressure sewerage applications around the world.ince the invention of Ductile Iron, also known as Spheroidal Graphite Iron or Nodular Cast Iron in 1949, it has become the most preferred pipe material for water supply and pressure sewerage applications around the world.
The 1994 Federal Register TRI listing of chlorsulfuron (59 FR 1788, January 12, 1994) also cited a slight treatment-related decrease in maternal fertility in the F3 generation observed in a rat chronic toxicity study (Ref.
The first important synthetic organic pesticide was a chlorinated hydrocarboon (or organochlorine): dichlorodiphenyltrichloroethane or DDT. DDT was discovered in 1939 by a Swiss chemist Paul Muller. In its early days, it was hailed as a miracle for a number of reasons:DT (and DDE, a breakdown products from DDT) also appeared in the fatty tissues of seals and Eskimos, far from any area of use, indicating that, because of its persistence, it was being transported for long distances in the atmosphere and by marine mammals and fishes.