Potassium iodide, for use

Potassium hydrogen fluoride, 1 140 Potassium iodide, for use as a primary standard, 1 163 Potassium metaperiodate, 1 171 Potassium molybdoeyanide dihydrate, 3 160... 

Iodine compounds are important in organic chemistry and very useful in medicine. Iodides, and thyroxine which contains iodine, are used internally in medicine, and as a solution of KI and iodine in alcohol is used for external wounds. Potassium iodide finds use in photography. The deep blue color with starch solution is characteristic of the free element. 

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

The history of the iodides dates from the time of J. L. Gay Lussac s discovery 1 of hydriodic acid in 1813. Iodides occur in sea-water, and in the waters of many natural springs and brines. Iodides also occur in varec in the nitre beds of South America and in many natural phosphates. In whatever form iodine occurs in these substances, it is usual to extract this element as iodine, and subsequently to convert this into the iodide—generally potassium iodide. Potassium iodide is used in analytical and photographical work, and medicinally for the treatment of scrofulous, rheumatic, and syphilitic diseases. Sodium iodide is used as a precipitant for gold and silver in the treatment of weak copper ores from Tharsis, etc. 

Sicherer SH. Risk of severe allergic reactions from the use of potassium iodide for radiation emergencies. J Allergy Clin Immunol 2004 114(6) 1395-7. 

Buchanan, Dekker and Long used periodate oxidation, followed either by Schiff s reagent (for cis-diols) or potassium iodide (for triols). The test is general for non-reducing carbohydrates having the necessary configuration of hydroxyls. Lead tetraacetate oxidation requires no further reagent to reveal the spot.66... 

The other commonly used method in kinetic work is to measure the pressure rise during decomposition. Bircumshaw and Newman studied the decomposition of ammonium perchlorate using a McLeod gauge as the measuring device. They also studied the decomposition in a stream of nitrogen, analysing the products chemically by adsorption of CI2 in potassium iodide. For measurements in a stream of inert gas, a katharometer could be used as a detection device. Other methods of pressure measurement are also applicable, especially where a rapid reaction demands that a record be obtained. 

Reactions of /V-chloropyrrole, /V-chloroindole, and A-chlorobenzotria-zole with sodium or potassium iodide are used for their quantitative iodo-metric determination (78JOC2639 82JOC1008 90MI1) (Scheme 38). 

Sperling et al.[4] determined arsenic(lll) and total arsenic in sea and lake waters by ETAAS, following on-line reduction and preconcentration of the DDC complex using a micro-colunm packed with C g sorbent, using a manifold modified on the basis of that shown in Fig. 4.11. A mixture of sodium sulphite, hydrochloric acid, sodium thio-sulphate and potassium iodide was used to achieve fast reduction of arsenic(V) to arsenic(IIl), and ethanol was used to elute the sorbed arsenic-DDC complex. The detection limits for As(ni) and As(ID+V) were 0.11 and 0.15 pg 1 respectively. 

This process can be used when no chlorite is present in the range from 0.1 to approximately 0.002 mg/1 CIO2, using a 5-cm cuvette. Chlorine must first be eliminated with potassium bromide and sodium formate. In order to remove chlorine, 1.5 ml double-distilled water and 0.5 ml KBr solution are added to 50 ml of the water to be analyzed after 1 min. 0.5 ml sodium formate solution is added and allowed to stand for 15 mins. If no chlorine is present, 2.5 ml double-distilled water is simply added to the water to be analyzed. Approximately 3 drops of sulphuric acid are added in order to adjust to pH 2.5 with the aid of a pH meter. Then, 0.5 ml potassium iodine solution is added and mixed. The extinction is subsequently measured at 350 nm against a reference solution (52.5 ml double-distilled water, adjustment with approximately 3 drops H2SOz to pH 2.5 + 0.5 ml potassium iodide solution), using a 5-cm cuvette. The concentration of CIO2 is read off from the calibration curve. 

For separation of silver,- lead and mercury a moist column of AlgO and potassium Iodide was used. Separate zones of Agl, Hggig and Pbig appeared. With the copper group (Cu, Cd, Pb, Bl), AlgOg moistened with saturated NagS or 2N (NH )gS solution was used (K2). 

O-Alkylation. The most thoroughly investigated alkylation using 1 is with oxygen nucleophiles. Only a limited number of successful O-alkylations exist and are currently limited to sodium acetate, a potassium carboxylate (15), and substituted phenols. The conditions used in all cases employ polar aprotic solvents (e.g., DMF, DMSO) and elevated temperatures, and use either 2 directly (eq 8) or sodium iodide or potassium iodide for in situ conversion of 1 to 2 (eq 9). 

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