This paper discusses the salient features associated with the variation in the BODs
and dissolved oxygen concentration in the Kadinamkulam Kayal based on fortnightly
data from two selected stations from October1987toSeptember1988.The BODs ranged
from 5.76 to 24.39 mg/l in the surface water and from 4.96 to 22.60mg!1 in the bottom
waterat station-l whereas at station-2, it ranged from 0 to 3.74mg/1 in the surface water
and from 0 to 3.40 mg!l in the bottom water. The dissolved oxygen concentration
ranged from 0 to 0.72 mglI in the surface water and from 0 to 0.42 mg!l in the bottom
waterat station-I, At station-2 it ranged from 2.69 to 6.21mg!1 in the surface waterand
from 1.97 to 5.74 mg!1 in the bottom water. The pre-monsoom period showed the
highest BODsof 16.68mg!I while the monsoon period showed the lowest of 0.61 mg!I.
The dissolved oxygen concentration reached its peak during the monsoon period (5.52
mg/I). Long spells of anoxic condition during the post and pre-monsoon periods was
a characteristic feature of the retting zone
Description:
MAHASAGAR
Vol.23, No.2 (December), 1990, pp. 95-101