Instructions:
Procedure for iodide
(1) rinse the measuring vial before use with aquarium water and add 2 ml of water into the syringe.
(2) add 6 drops of reagent I2-1 and stir gently for 10 seconds.
(3) add 6 drops of the reagent I2-3 and stir gently for 2-3 seconds after each drop
(I2-2 omitted in this procedure!). After 4 minutes flat have added this reagent compare the color with the color chart of the part of the iodide keeping the measuring vial firmly with a side on a white part of the color chart and looking through the opposite face. Waiting for more than 4 minutes can cause darkening of the colors. For the comparison of colors use a diffuse light. Sometimes the colors can have a more yellow tone depending on the light color temperature.
If the color becomes blue, lilac or black or a kind of precipitation is that the concentration of iodide is far below 0.2 ppm.
After each measurement rinse ten times the vial with water from the tap or osmosis.
Combined procedure of iodates and iodine:
(1) rinse the measuring vial prior to use with aquarium water and add 1 (a) ml of aguaron syringe.
(2) add one drop of reagent I2-2
(I2-1 is not used in this procedure) and stir gently for 10 seconds.
(3) add 6 drops of the reagent I2-3 and stir gently for 10 seconds.
Let stand for 3 minutes.
Now look on the one hand the measurement vial. If the color is dark yellow, green or blue or blue particles this does presuppose that the concentration of iodates is higher than 0.2 ppm and a precipitation may occur in the next step. This may occur in the next step in the majority of solutions without color with small blue particles.
The next step allows the extent if the concentration of iodates are very below 0.2 ppm.
(4) add 5 drops of I2-2 and shake gently for 10 seconds. Now compare the colors with the part of the colour chart iodate by keeping one side of the measuring vial firmly against the white part of the color chart and looking through the opposite face.
After each measurement rinse ten times the vial with water from the tap or osmosis.
NOTE:
ABOVE FOUND HERE.