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Seachem MultiTest Iodine & Iodide

Seachem MultiTest Iodine & Iodide
Seachem MultiTest Iodine & Iodide
Price in reward points: 1189
  • Stock: In Stock
  • Product Code: S020624
  • Returnable Within: 30 Days
  • Delivery: Next Working Day - Free Over £99.99
  • Usually Dispatched Within: 1 day

About this product

The Seachem MultiTest Iodine & Iodide kit measures iodine or iodide to less than 0.005 mg/L. Seachem MultiTest Iodine/Iodide performs over 75 tests and contains a reference sample for validation.

Seachem MultiTest Iodine & Iodide Instructions

  1. Prepare working Iodide Reagent 2: (a) fill empty plastic vial to thread level with deionized (DI) or distilled water (not supplied); reverse osmosis (RO) water may not be sufficiently pure; add 1 drop Iodide Reagent 2a (using dispensing pipette) and 1 drop Iodide Reagent 2b; (b) cap vial and mix; (c) wait 5 minutes before using. The working Iodide Reagent 2 solution is usable for 3–4 hours.
  2. Using supplied spoon, dispense one level measure of Iodide Reagent 1 to a test cavity.
  3. Add one full stem of sample using sample pipette to the test cavity containing Iodide Reagent 1. [If a blue color develops now, elemental iodine is indicated. This should be viewed as a hazardous status. Use a dechlorinator such as Prime™ to remove elemental iodine.]
  4. Add 2 drops Iodide Reagent 2 (that you already prepared in Step 1 above) with dispensing pipette to the test cavity and stir briefly with straight end of spoon. It is normal for not all of the powder to dissolve.
  5. Promptly compare color to color chart as soon as color peaks (20–40 seconds). Peak color will remain stable for about a minute. Rinse out test plate after use and dry.

Reference test

The proper performance of the Seachem MultiTest Iodine & Iodide kit may be validated by running a test in the normal manner except that the reference sample is used in place of a aquarium sample. It is not necessary to run a reference test to use this kit. The only time you might choose to run a reference test is if you have cause to believe the test is giving incorrect results. If you run a test using the reference sample and obtain the correct result (based on the known reference value provided) then you know the test is giving correct results. To run a reference test, use the Iodide Reference as the sample in a iodide test. Reference value is 0.06 mg/L.


If color is very faint you can increase the sensitivity of the test by increasing the number of drops used in Step 4. For example, you can triple the sensitivity by using 6 drops (e.g. a value of 0.02 mg/L will read as 0.06 mg/L). Likewise, if color is off scale you can decrease sensitivity to get the color back on scale by either (a) reducing the # of drops in Step 4 or (b) by prediluting your sample, or by a combination of both. Predilution can be done in the test well. A full stem of the sample pipette is equal to 14 drops, so adding 7 drops of sample and 7 drops of DI water will yield a 50% dilution (e.g. a 0.1 mg/L sample diluted will read as 0.05 mg/L). Better accuracy will be attained with colors corresponding from low to the mid-range of the color scale. Chlorine and chlorine removing products will interfere. If a water change has been made with water containing chlorine or a chlorine removing product, wait about 8 hours before testing. Neither chloride nor bromide interfere. Ozone will likely interfere. The use of ozone is not recommended in seawater, since it generates toxic free halides (chlorine, iodine, bromine).


This kit is specific for iodine/iodide and easily detects down to 0.001 mg/L. The color scale peaks at 0.10 mg/L. Natural seawater (NSW) concentration of iodide is 0.06 mg/L. Ideally, it is advisable to maintain iodide close to NSW concentration. Concentrations above NSW may not be harmful, and, within limits, may even be beneficial, but maintenance at elevated concentrations should be considered experimental. If you find that your reef tank has low iodide, this may be a chronic status and concentration should be raised gradually, since a sudden increase in iodide may be detrimental.

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