Colorimetric determination of Ammonium Procedure: In alkaline medium ammonium ions react with chlorine to form chloroamine which in the presence of a catalyst forms a blue coloured indophenol with phenols. (Reaction basis according to DIN 38406-E5)
50,22 €
Colorimetric determination of Nitrate Nitrate is reduced to nitrite with an inorganic reducing agent. Nitrite is then diazotised with an aromatic amine and simultaneously coupled to form an azo dye.
30,92 €
Colorimetric determination of Nitrite In acidic solution sulphanilic acid or sulphanilamide are diazotised with nitrite. The diazonium salt is then coupled with an aromatic amine, forming an intensely coloured azo dye. Organic colloids, chlorine, humic acids and coloured heavy metal ions interfere.
37,80 €
Colorimetric determination of Phosphate Ammonium molybdate reacts with phosphate ions to form phosphomolybdic acid which is reduced to molybdenum blue (Reaction basis according to DIN EN ISO 6878-D11).
36,45 €
Determination of Potassium Potassium reacts with sodium tetraphenylborate to form a precipitate. Under defined conditions this turbidity can be used for concentration measurements.
98,67 €
Colorimetric determination of Iron Triazine method: Iron ions react with a triazine derivative to form a violet complex.
50,76 €
Colorimetric determination of Copper In weakly alkaline medium Copper ions react with cuprizone forming a blue colour complex.
41,31 €
Colorimetric determination of Zinc At a pH of 8.5 – 9.5 zinc ions react with zincon to form a blue colour complex. Acidic, alkaline and buffered samples have to be adjusted to pH 9 for the test.
51,71 €
Colorimetric determination of Manganese In alkaline solution Manganese ions react with formaldoxime to form an orange-red complex. (Reaction principle analogous to DIN 38406-E2)
58,05 €
Determination of Sulphate Sulphate reacts with barium ions forming a precipitate of barium sulphate.
48,74 €