Page 411 - Soil and water contamination, 2nd edition

398 Soil and Water Contamination

-
+
2-
2-
9. SO + 8 H + 8 e → S + 4 H O
4 2
2+
2-
Sulphide ion (S ) will precipitate with metal ions, especially Fe .
CHAPTER 6
2. N:P mass ratio = 15.4, which implies P limitation.
6 a. Winter;
b. Dry sandy soil;
c. Deep water table;
d. Soils poor in organic matter.

7. a. Summer;
b. Neutral soils;
c. Soils rich in organic matter.

CHAPTER 7

8. a. Metal sulphides;
b. Weathering of metal sulphides;
c. Dissolved and adsorbed to sediments;
d. Immediately downstream of the source, the relationship between heavy metal
concentrations and clay and organic matter content is weak; it becomes stronger with
increasing distance downstream.

CHAPTER 8

5. a. 0.281 g
b. Pb-210

7. a. 90 Sr
b. 137 Cs
c. 131 I

CHAPTER 9

2. a. 1,2-Dichlorocyclohexane:C H Cl ; biphenyl: C H ; anthracene: C H ;
6 10 2 12 10 14 10
b.
Cl
Cl
CH Cl 6642 6642 6642
Cl Br
H C CH F F
CH C CH 2 C
3 CH 3 C
H C CH 2 H H
CH 3 2
CH
Cl
Cl
3-bromo-2-chloro-2-methylbutane 1,2,4-trichlorocyclohexane cis-1,2-difluoroethene m-dichlorobenzene

10/1/2013 6:47:53 PM
Soil and Water.indd 410
Soil and Water.indd 410 10/1/2013 6:47:53 PM