§ Mr. AingerTo ask the President of the Board of Trade if he will list the type and quantity in tonnes of(a) drilling chemicals and (b) production chemicals notified to him as discharged by offshore operations in each year since 1979; and what is his best estimate of the proportion this represents in each year of the total amount of each chemical discharged into United Kingdom waters.

Chemicals used/discharged 1991 Chemical Product Drilling Production Quantity (tonnes) discharged Antifoam X X 5 Asphalts/asphalt based products X 32 Biocides X X 252 Carrier Solvent X X 1 Coagulants/Deoilers X X 119 Corrosion inhibitors X X 568 Cutting wash fluids X 16 Defoamers X 83 Demulsifiers X 119 Detergents/Cleaning fluids X 742 Dispersants X 268 Drilling lubricants X 163 Dyes X 32 Emulsifiers X 565 Fluid loss control X 628 Gas Treatment X 1,934 Gels X 5,361 Inorganic chemicals X 24,873 Lignosulphonates lignites X 245 Lost circulation material X 1,882 Oxygen scavengers X 116 Polymeric viscosifiers and filtrate reducers X 2,577 Shale inhibitors X X 3,300 Shale inhibitors/encapsulators X 1,100 Thinners X 83 Viscosifiers X 3,284 Weighting agents and inorganic gelling agents X 152,649 Total 200,997