LaMotte AM-41 Hydroponics Test Kit - Manual (Page 14)

pH
*Hydroculture pH Indicator
Solution
Methyl Red, Bromthymol Blue
in 95% alcohol *5132
The pH indicator is a mixture of organic dyes that exhibit different colors a
various pH levels.
PHOSPHORUS
*Hydroculture VM
Phosphorus Reagent
Ammonium Vanadate Molybdate
in Sulfuric Acid Solution *5138
The inorganic phosphate reacts with the molybdate solution to form a
yellow phospho-molybdate compound.
POTASSIUM
*Tetraphenylboron Powder Sodium Textraphenylborate *6364
*Sodium Hydroxide Reagent Sodium Hydroxide *4259WT
A solution is made alkaline with sodium hydroxide. Potassium combines
with sodium tetraphenylborate to form potassium tetraphenylborate which
precipitates and causes the solution to become cloudy.
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