MSDS (Material Safety Data Sheet)
EM Quant® Cobalt Test, Catalog No. 10002Test strips and reagent for the detection and semi-quantitative determination of cobalt(II) ions GeneralInteresting applications for the cobalt rapid test are to be found in the testing of waste water, electroplating baths, in the electronics industry, metal industry, in the assaying and refining of ores, and for checking pigments and other colorants in the glass and ceramic industries. Principle of the DeterminationThe test is based on the formation of a complex between cobalt(II) and thiocyanate ions which displays a brilliant blue color in the presence of a high molecular ether. As the reaction zone contains a buffer, the complexing reaction is not influenced by the hydrogen ion concentration of the solution between pH 1 and pH 7. Even in highly acidic solutions (pH 0 to 1) there is only a very slight color shift to green. Graduation0 - 10 - 30 - 100 - 300 - 1000mg/l (ppm) Co2+ Directions
NotesThe pH of the sample solution should be between 1 and 7. Alkaline solutions must be buffered with sulfuric acid. Detection is normally disturbed by iron(III) ions, which produce a blood-red thiocyanate complex, and by copper ions, which produce a green to brown color. The reaction zone of the strip contains a special masking agent to suppress these interfering secondary reactions. This makes the test so selective that as little as 10mg/l of cobalt(II) can still be detected in the presence of 7500mg/l of copper(II) and 5000mg/l of iron(III). Influence of AnionsThere is no interference at less than:
Influence of CationsThere is no interference at less than:
Elimination of InterferenceNO2– interferes by producing a pink tint (eliminate by adding amidosulfuric acid until effervescence ceases).
*Add KMnO4 crystals until the pink color persists. Standard (1000 mg/l)Cobalt standard solution, 500ml. |
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