YaliTech WaterLink Spin Touch Instruction Manuel page 13

If the concentration for one test factor is significantly out of the range for the reagent
system, the accuracy of the results for the other test factors may be affected.
METHODS AND INTERFERENCES
Test Factor
Alkalinity
Ammonia
Calcium
Hardness
Magnesium
Nitrate
Nitrite
pH
Phosphate
CONVERSIONS
Ammonia (NH )
3
Ammonia in water occurs in two forms: toxic unionized ammonia (NH
relatively non-toxic ionized form, ammonium ion (NH
both forms as ammonia (NH
actual proportion of each compound depends on temperature, salinity, and pH. A greater
concentration of unionized ammonia is present when the pH value and salinity increase.
1. Consult the table to find the percentage that corresponds to the temperature, pH, and
salinity of the sample.
2. To express the test result as ppm Unionized Ammonia (NH
Ammonia test result by the percentage from the table.
3. To express the test result as ppm Ionized Ammonia (NH
Ammonia determined in step 2 from the Total Ammonia.
Method
Buffered indicator reagent
Salicylate
Buffered indicator reagent
Buffered indicator reagent
Buffered indicator reagent
Zinc reduction, Diazotization
Diazotization
Mixed indicators
Phosphomolybdate, Stannous
chloride/ascorbic acid
reduction
) to give the total ammonia concentration in water. The
3
13
Interferences
Alkalinity < 20 ppm, Quats
and polyquats in high
concentrations
Nitrite above 5 ppm, Sample
temperature <50°F (10
°C), High concentrations of
reducing agents
Calcium > 800 ppm,
Magnesium > 2000 ppm
None
pH <7, pH >9, Borates > 200
ppm
Chlorine neutralizer
containing sodium thiosulfate
Copper > 10 ppm
Turbidity
Iron > 5 ppm, Ammonia >5
ppm
) and the
3
4 +
). This test method measures
), multiply the Total
3
4 +
), subtract the Unionized