LaMotte STH Outfit - Manual (Page 23)

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Magnesium Test - The dye Titian Yellow, *Magnesium Test Solution 1
(5140), is absorbed on the precipitated magnesium hydroxide which
is formed when *Magnesium and Manganese Test Solution #2 (5145WT),
sodium hydroxide is added. The degree of color in the test reaction
depends on the amount of precipitate formed.
Manganese Test - Manganese is oxidized by the Manganese Periodate
Reagent (6311) to form permanganate.
Aluminum Test - *Aluminum Test Solution (5101) is an alcoholic
solution of hematein.
Nitrite Nitrogen Test - *Nitrite Nitrogen Reagent 1 (5151WT) is
hydrochloric acid. *Nitrite Nitrogen Reagent 2 (5152WT) is Lombard’s
Solution, which consists of sulfanilic acid, ammonium chloride, and
phenol. *Nitrite Nitrogen Reagent 3 (5153WT) is sodium hydroxide.
A yellow dye is formed when nitrite is present.
Ferric Iron Test - *Ferric Iron Test Solution (5116PS) is potassium
thiocyanate, which reacts with iron to give the colored ferric thiocyanate.
Sulfate Test - *Sulfate Test Solution (5171) is barium chloride, which
reacts with sulfate to form the precipitate, barium sulfate.
Chloride Test - Deionized water is used as the extracting solution.
*Chloride Test Solution (5111) is silver nitrate, which reacts to form the
precipitate, silver chloride.