| An investigation was made to determine the influence of the dumping of a 1000 ton day<sup>-1</sup>, on the average, of acid-iron waste from the titanium dioxide industry into the shallow but turbulent Southern Bight of the North Sea. This waste contains some 20% sulphuric acid and 2% iron. After the passage of the barge that discharges 10 ton of waste min<sup>-1</sup> into its wake, the vertical and horizontal distributions of the pH, iron-concentrations and turbidity were measured as a function of time. It appeared that a few seconds after the discharge and for a very brief period, the pH was down to approx. 4 and the Fe-concentration was 13 mg l<sup>-1</sup>. More than 1 min after the discharge a pH below 6 and an... |
