Thymol —Sulfuric Acid

Figure 63. Identification of sugars after derivatization with the thymol-sulfuric acid reagent...

Ethyl acetate-ethanol-acetic acid (60%)-sat.aq. boric acid sol. 5 2 1 1 Fru, Sue, Glc fracto-oligosaccharides (kes-toses) Reaction mixnire thymol-sulfuric acid TLC 19,68... 

In the known absence of bromoform, iodoform, chloral, and other halogenated methanes, the formation of phenyhsonitrile with aniline provides a simple and faidy sensitive but nonspecific test for the presence of chloroform, the carbylamine test. Phenyhsonitrile formation is the identification test given in the British Pharmacopoeia. A small quantity of resorcinol and caustic soda solution (10% concentration) added to chloroform results in the appearance of a yellowish red color, fluorescing yeUow-green. When 0.5 mL of a 5% thymol solution is boiled with a drop of chloroform and a small quantity of potassium hydroxide solution, a yellow color with a reddish sheen develops the addition of sulfuric acid causes a change to brilliant violet, which, diluted with water, finally changes to blue (33). 

Dipping solution Dissolve 0.5 g thymol in 95 ml ethanol (96%) and cautiously add 5 ml cone, sulfuric acid. 

Another non-specific color reagent for RDX and HMX is a solution of thymol in concentrated sulfuric acid [3, 56, 59]. It produces a typical red color. Positive results are also obtained with non-explosive compounds such as sugars and aldehydes. 

Test 4 Same as Test 2, but add an equal amt of cryst thymol and 3 drops of coned sulfuric acid. Stir and observe the color after 5 mins. 

Determination of Acidity or Alkalinity of NG. Place a lOg sample of the NG by pipet into a tared beaker and retare. Add 100ml of benzene and transfer to a 250-ml separatory funnel when dissolved. Wash twice with 50-ml portions of neutral distd w, combining the washes in a 250-ml beaker. Add several drops of bromo-thymol blue indicator and immediately titrate with 0.01N NaOH if yellow, or with 0.01 N sulfuric acid if blue. Run a blank on 100ml of benzene and correct the first titratiaQ value. Then, % acidity (as sulfuric acid) or alkalinity (as sodium carbonate) = kVN/W, where k is... 

If the above test is positive confirm the identity of amatol by one or several of the following tests A) Place about 0.05 g of unknown material in an indenture of a white porcelain spot-test plate and add 2-3 drops of 65 to 6855 aq soln of ethylenediamine and stir — the color of soln shall be maroon B) Repeat the test using a new 0.05 g sample and 3-4 drops of DPhA soln (lg in 100 cc of coned CP sulfuric acid), stir and wait 1 min the color of soln shall be dirty green C) Repeat the test using a new sample, an equal amt of thymol and 3 drops of coned sulfuric... 

Thymol (0.5%) in sulfuric acid (5%) Pink spots after heating (120°C, 20 min) 103... 

Thymol Sodium Sulfuric acid Acetic anhydride... 

Universal bH indicator oaDer, Add a droD of Nesslet s reagent (to 5g of Kl in a min of cold water add a satd aq Hjgl solo until a ppt forms add 40 ml of 50 aq KOH, let settle, dilute to 100 ml with water, let settle and decant) and note color of ppt. Place 50 mg of sample in each of three depressions on a spot-test plate. To one add 2—3 drops of a 65—68% aq ethylene diamine soln, stir and note color of soln to another add 3—4 drops of a solution of Ig diphenylamine in 100ml of ooned sulfuric acid, stir, and note color of soln after 1 min to the last sample add 50mg of thymol and 3 drops of coned sulfuric acid, stir and note color after 5 min... 

Derivatization reagent Thymol-sulfuric add Diphenylamine-aniline-phosphoric acid... 

Thymol added to a sulfuric acid solution of titanium produces an intensq bloodied color. 

Phthalic acid Heat a small sample of the polymer with thymol (1 part sample to 3 parts thymol) and 5 drops of concentrated sulfuric acid for 10 min at 120 - 150 °C. After cooling, dissolve the sample in 50% ethanol and make the solution alkaline by adding 2 N sodium hydroxide. Phthalates produce a deep blue color. 

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