Analysis of specific ions dissolved in water is quick and simple with the help of Ion Selective Electrodes (ISE) or with colorimeters (also known as photometers).
These methods use a chemical reagent that, in the presence of the ion being tested, will develop a colour, the intensity of which is proportional to the concentration of the ion (Beer-Lambert's Law).
The intensity of the colour can be measured visually against a color chart (Test-kit method) or with a photometer (Colorimeter method) for more precision.
Some Test-kits use a titration method (addition of the reactive until there is colour).
Ion Test Kits
|
Reference |
Parameter |
Range
mg/L (ppm) |
Number
of tests |
|
HI 4820 |
Acidity |
0 to 500 |
100 |
|
HI 4811 |
Alkalinity |
0 to 300 |
100 |
|
HI 4824 |
Ammonia (fresh water) |
0 to 2.5 |
25 |
|
HI 4826 |
Ammonia (sea water) |
0 to 2.5 |
25 |
|
HI 4830 |
Bromine |
0 to 3.0 |
60 |
|
HI 4818 |
Carbon Dioxide |
0 to 100 |
100 |
|
HI 4815 |
Chloride |
0 to 1 000 |
100 |
|
HI 4831 |
Chlorine (free and total) |
0 to 2.5 |
50 |
|
HI 4812 |
Hardness |
0 to 300 |
100 |
|
HI 4839 |
Hydroxide |
0 to 10 g/L |
100 |
|
HI 4832 |
Iodine |
0 to 2.5 |
50 |
|
HI 4834 |
Iron |
0 to 5 |
50 |
|
HI 4810 |
Oxygen |
0 to 10 |
100 |
|
HI 4833 |
Phosphate |
0 to 5 |
50 |
|
HI 4822 |
Sulfite |
0 to 200 |
100 |
|
HI 4835 |
Salinity |
0 to 40 ppt (g/Kg) |
100 |