Page 326 - e-Book

Field study:
Study material Status Residual Residual Total Total Total
mercury (mg cadmium chlorophyll phaeophytin carotene (mg g -1
-1 -1 -1 -1
g dry wt ) (mg g dry (mg g (mg g dry wt )
Mixed algal C ND wt ) dry wt ) dry wt ) 18.2±5.4
28.9±9.2
ND
27.9±6.8
scum collected UC 3.2±0.7 2.6±0.4 12.8±7.8 15.6±11.2 10.8±6.2
from crop field ( -54.1) ( -46.02) ( -40.7)
Sample Status Residual Residual Total Total Total
collected from mercury (mg cadmium chlorophyll phaeophytin carotene
-1
-1
-1
-1
-1
contaminated crop g dry wt ) (mg g dry (mg l ) (mg l ) (mg l )
field wt )
Green gram- UC ND ND 2.13±0.26 1.84±0.31 0.028±
Vigna radiata, 0.009
C 8.5±1.3 11.4±0.7 0.96±0.14 0.89±0.22 0.014±
(L) Wilczek
(-54.9) (-51.6) 0.005 (-50)

Black gram- UC ND ND 2.35±0.11 2.09±0.13 0.031±
Vigna mungo, 0.006
C 7.8±0.9 8.3±1.1 1.08±0.22 0.88±0.27 0.018±
(L.) Hepper
0.011

(-54.04) (-57.9) (-41.9)
Rice- UC ND ND 2.85±0.12 2.28±0.24 0.039±

Oryza sativa,L. 0.014
C 10.2±0.6 13.2±0.8 1.48±0.15 1.16±0.13 0.011±
(Lalit var.)
0.008

(-48.1) (-49.1) (-71.8)
Ragi - UC ND ND 1.19±0.06 0.96±0.11 0.016±

Eleusine 0.004
C 4.87±1.6 4.32±0.7 0.37± 0.03 0.29±0.04 0.004 ±
coracana,

Gaertn
0.002 (-75)

(-68.9) (-69.8)

Plant leaf samples and algal scum collected from the crop fields at different seasons
indicated very interesting and alarming results. The algal scum collected from the crop fields

contained algal species like collected from Nostoc muscorum, C.Agardh, Anabaena
cylindrica, Lemm., Westiellopsis prolifica, Janet , Calothrix sps., Scytonema sps. and some

other species not identified. Nostoc muscorum, C.Agardh was the dominant algal species in

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