env chem Flashcards
(16 cards)
1
Q
dissolved oxygen in cold water
A
10 ppm
2
Q
dissolved oxygen in air
A
2,00,000 ppm
3
Q
clean water
A
BOD≤ 5 ppm
4
Q
polluted water
A
BOD≥ 17 ppm
5
Q
F- ion above—–ppm leads to
A
brown mottling teeth
6
Q
eutrophication means
A
7
Q
excess f- ion conc over—-ppm leads to
A
harmful to bones and teeth
8
Q
lead conc
A
≤50 ppb
9
Q
so4 -2 conc
A
≤ 500 ppm
10
Q
no3- conc
A
≤50ppm
11
Q
excess nitrate causes
A
blue baby syndrome
12
Q
fe and al max conc
A
0.2
13
Q
mn max conc
A
0.05
14
Q
cu max conc
A
3
15
Q
zn max conc
A
5
16
Q
cd max conc
A
0.005
