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Topics - Reefkeeping
Important Seawater Parameters

Concentration of chemical elements and groups and some values for other parameters.


Seawater
Value

coral-shop Recommendation

Unit

Test

Parameter

Min

Max

Opt

 

413

Ca

400

450

420,00

mg/l

CS TEST Calcium

1.290

Mg

1.150

1.400

1.250,00

CS TEST Magnesium

2,00 - 2,50

Alkalinity

2,40

3,50

2,50

mmol/l(3)

CS TEST ALKALINITY

8,1 - 8,3

pH

8,0

8,3

8,10

[]

 

 

16,55 - 22,86

Chlorinity
t = 25°C
ρ:

ρ = 1,022

17,90

g/l

CS TEST CHLORINITY

ρ = 1,023

18,70

ρ = 1,024

19,50

ρ = 1,025

20,00

ρ = 1,026

20,80

2,41 - 3,39

Sulphates
t = 25°C
ρ:

ρ = 1,022

2,61

g/l

CS TEST Sulphates

ρ = 1,023

2,73

ρ = 1,024

2,86

ρ = 1,025

2,94

ρ = 1,026

3,06

 

7,89

Sr

8

25

15,00

mg/l

 

4,5

B

4,4

4,8

4,50

 

0,025 - 0,064

I

0,04

0,08

0,06

 

399

K

390

410

400,00

CS TEST Potassium

 

0

NH4+

0

0,000

mg/l

 

0

NO2-

0

0,000

 

0 - 0,25

NO3-

0

20

0,025

 

0 - 0,10

PO43-

0

0,2

0,025

 

0 - 5,1

Si

0

0,3

0,000

 

0,1 - 0,3

DOM4

0.2

0.4

0,2

mmol/l

CS TEST Organics

 

1,020 - 1,029

Density

1,022

1,024

1,023

kg/l

 

< 0 - 30 >

Temperature

20

28

25

°C

 

Seawater
Value

Parameter

Min

Max

Opt

Unit

Test

coral-shop Recommendation

(1) Alkalinity (simplified): A measure of the ability of seawater to neutralize acids.

(2) pH: -log(a(H3O+)) - negative value of common logarithm of H3O+ ions activity.

(3) Chlorinity: Total concentration of halides (exlc. fluorides) in seawater, expressed as chlorides. Its related to salinity and density.

(4) DOM: Total concentration of dissolved organic matter.

 
 
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