Ph Values

The pH measures the acidity or alkalinity of water, with the value 7 representing neutrality. Below this level the water is acid, and above it the water is alkaline (or basic). Categorizing water as acid does not mean that it contains dangerous acids. In forest streams and rivers the water accumulates with acid organic fluid (humic acid) derived from the decomposition of plants (humus), producing an amber yellow color.

Generally speaking, aquatic life can exist only between pH 5 and 9. These extreme values are rarely found in an aquarium, where the pH ranges from 6 to 8 according to the type of water, and usually lies between 6.5 and 7.5. In aquariums, the term acid water corresponds to a pH between 6 and 6.8, while alkaline water

Maximum oxygen content of water as a function of temperature •

T°C

mg/lrter

15

10.1

16

9.9

17

9.7

18

9.5

19

9.3

20

9.1

21

8.9

22

8.7

23

8.6

24

8.4

25

8.3

26

8.1

27

7.9

28

7.8

0 0

Post a comment