biologia - Studia

V. MUNTEAN, C.-G. MAIER, R. CARPA, C. MUREŞAN, A. C. FARKAS
Phosphatase
Catalase
4,5
35
mg phenol/g sediment
4
3,5
3
2,5
2
1,5
1
0,5
0
P1 P2 P3 P4 P5
mg splitted H 2 O 2 /g sediment
30
25
20
15
10
5
0
P1 P2 P3 P4 P5
Dehydrogenase
EISQ
1,6
0,3
mg formazan/g sediment
1,4
1,2
1
0,8
0,6
0,4
0,2
0,2
0,1
0
P1 P2 P3 P4 P5
0,0
P1 P2 P3 P4 P5
Fig. 3. Enzymatic activity in sediments. EISQ = enzymatic indicator of sediment quality.
The highest individual values have been registered as follow:
- phosphatase activity (4.5 mg phenol/g dry matter sediment) in P5;
- catalase activity (28.98 splitted H 2 O 2 /g dry matter sediment) in P3;
- potential dehydrogenase activity (1.408 mg formazan/g dry matter sediment)
in P4.
The values of the phosphatase activity are significantly lower than those
registered in the same dam sediments by Curticăpean and Drăgan-Bularda (2007).
The catalase and the potential dehydrogenase activites proved to be higher than
those obtained by the same authors. The EISQs calculated by the cited authors are
higher than ours, because of the very high level of the phosphatase activity.
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