Potassium iodide reagent

No color with potassium iodide reagent USP test. 

In all three methods a blank is obtained. To ascertain the blank, excess sodium thiosulfate is added to the potassium iodide reagent at a concentration of 4.0 x 10 14 mol/1. Samples were re-analysed and the appropriate blank subtracted from the sample signal. 

Dobbin s reagent analychem A mercuric chloride-potassium iodide reagent used to test for caustic alkalies in soap. dab-anz re a- ant ... 

Cinchonine-potassium iodide reagent (1 %) orange-red colouration or precipitate in dilute acid solution. 

Alternatively, dissolve a little of the ppt. in 1-2 drops dilute HN03. Place 1 drop of the solution upon filter paper moistened with cinchonine-potassium iodide reagent. 

Cinchonine-potassium iodide reagent (1 %). Dissolve 1 g cinchonine in a mixture of 99 ml water and 1 ml dilute nitric acid (2m) by boiling, let the mixture cool and dissolve 1 g potassium iodide, KI, in the solution. The reagent is stable for 2 weeks. 

Cleaning Up Combine all reaction mixtures in a beaker, add a few drops of acetone to destroy any unreacted iodine in potassium iodide reagent, remove the iodoform by suction filtration, and place it in the halogenated organic waste container. The filtrate can be flushed down the drain after neutralization (if necessary). 

Other nondestructive detection methods use iodine vapors or iodine-potassium iodide reagents (Mylius s reaction). Yellow, orange, or brown zones will appear on the layer. The zones will have to be marked, because the iodine will eventually evaporate. The sensitivity of the iodine test can be greatly increased by the use of layers containing rhodamine 6G. Most of the steroids are recovered unchanged af-... 

Figure 2. Effect of sample size on photometric determinations of low concentration (4.25 p.p.m.) of ozone with neutral and alkaline 1 % potassium iodide reagents...

Neutral potassium iodide reagent containing 13.61 g potassium dihydrogen-phosphate, 14.2 g anhydrous disodium hydrogen phosphate and 20.0 g potassium iodide in each 1000 mL of solution. 

Standard iodine solution was then diluted to a solution of iodine 4 x 10 5 N (1 ml = 0.96 pg ozone). Different portions of this standard iodine solution were diluted with 5% neutral potassium iodide reagent. 

After development on TLC plates, amino-substituted 1,3,5-triazines can be revealed by use of the chloro-toluidine reaction <83JC97>. This is a sensitive method developed for the detection of amino and imino compounds on paper chromatograms. The method depends on the formation of chloramines which are then detected by liberation of iodine from a starch-potassium iodide reagent. 

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