Accession Number : ADP006827

Title :   Treatment of Bottom Sediment containing Mercury and Monitoring Method Using Fishes,

Corporate Author : KUMAMOTO UNIV (JAPAN)

Personal Author(s) : Nakayama, Y. ; Kyuma, K. ; Hirota, R. ; Fujiki, M.

Report Date : APR 1992

Pagination or Media Count : 22

Abstract : In Minamata Bay, sediment containing mercury higher than 25 ppm has accumulated on the bottom, and dredging work continues. The dredging has been conducted carefully, and secondary pollution as a result of disturbance of the bottom sediment has been prevented. The mercury concentration in fishes was investigated to determine 'the conditions before dredging. As a result, a good correlation between the mercury concentration in fishes and the body length was found. Six kinds of fishes were chosen for monitoring. These were selected because they were present in sufficient numbers, the mercury concentration in them was adequate, and there was good correlation between mercury concentration and body length. The monitoring work has been successful, based on the results obtained.

Descriptors :   *DREDGING, *FISHES, *MERCURY, *POLLUTION, BAYS, BOTTOM, CORRELATION, LENGTH, MONITORING, SEDIMENTS, EXPOSURE(PHYSIOLOGY), TOXIC HAZARDS, WATER POLLUTION.

Subject Categories : Civil Engineering
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE