Thymol test

The presence of RDX may be confirmed by the Thymol Test(See item Q). A pink or rose color indicates the presence of RDX... 

Tetrytol, which consists of Tetryl St TNT, gives a red alkali-acetone test, a deep gm thymol test and a gm-bk DPhA test. For more definite identification, the.ingredients are sepd and then tested individually. Cabron tetrachloride, which is a much better solvent for TNT than for Tetryl, can be used for sepn of Torpex, which consists of RDX, TNT St Al, can be identified in the following manner ... 

Cyclic nitramines such as RDX or cyclotetra-methylenetetranitramine (HMX) are widely used in military composites such as Composition B (TNT and RDX) and Composition C-4 (US) or PE-4 (British) and in commercial blasting explosives such as Semtex (a Czech-made mining explosive). HMX is present as a by-product in RDX made by the Bach-mann process and has applications in explosives to be used in high-temperature environments. Chemical tests for RDX include the J-Acid and thymol tests. A number of TLC systems for RDX and HMX have been reported. With adequate sample, IR identification of the pure material in a micro-potassium bromide pellet is simple. If a diamond anvil sample holder or microscope attachment is available, excellent spectra of pure samples of milligram size or even of single crystals are easily obtained. When HMX is observed in RDX-based explosives, its concentration may suggest the national origin of the explosive. 

Hangarter found no systemic toxic or noxious side-effects in these initial studies with SACC even on long term i.v. administration. Aanalyses of blood components, kidney and liver functions (thymol test, Takata-Ara, Weltmann and... 

This distinguishes between a true reaction in the Thymol Test and a false reaction due to indoxyl in urine. 

Both tests resemble the thymol test for carbohydrates. The... 

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). 

The alkaline solution of thymol is made up to 100 or 200 c.c. as the case may require, using a 5 per cent, soda solution. To 10 c.c. of this solution in a graduated 500 c.c. flask is added a normal iodine solution in shgbt excess, whereupon the thymol is precipitated as a dark reddish-brown iodine compound. In order to ascertain whether a sufficient quantity of iodine has been added, a few drops are transferred into a test tube and a few drops of dilute hydrochloric acid are added. When enou iodine is present, the brown colour of the solution indicates the presence of io ne, otherwise the liquid appears milky by the separation of thymol. If an excess of iodine is present, the solution is slightly acidified with dilute hydrochloric acid and diluted to 500 c.c. From this 100 c.c. are filtered,off, and the excess of iodine determined by titration with normal solution of sodium thiosulphate. For calculation, the number of cubic centimetres required is deducted from the number of cubic centimetres of normal iodine solution added and the resultant figure multiplied by 5, which gives the number of cubia centimetres of iodine required by the thymol. 

The Japanese scientists tested the fiber optic carbon dioxide sensor86, prepared by dip-coating method - the sol-gel film containing indicator dye, thymol blue, was deposited on unclad fiber. The sensitive film had both organic and inorganic parts with good permeability. The differences between attenuation in N2 gas and in CO2/N2 mixture gas increased with the CO2... 

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. 

All this can mean that, if the aq soln of unknown sample is colorless in Test 2, no ppt with,Nessler s reagent, no color with ethylene-diamine in Test 2, deep blue color with DPhA in Test 3 and green a>lor with thymol soln in Test 4, it could be NG... 

Besides thymol, other terpenes have been tested for their toxicity against Varroa jacobsoni. Imdorf et al. determined in vitro the effective miticidal air concentrations, but with minimal effects on the bees as follows 5-15 pg/litre air for thymol, 50-150 pg/litre for camphor and 20-60 pg/litre for menthol 1,8-cineole was too toxic for honey bees [86], Another interesting paper considered the efficacy of different isomers of menthol on Acarapis woodi [87]. The natural crystals obtained from the plant, synthetic crystals and the L-form gave more than 96% mite mortality, while the D-form crystals only a 37% mortality. 

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... 

B. Identification. Place ca 0.2g of material in a 5 ml beaker, add 2-3 ml distd w and stir for 5 min. Decant the liq through a filter into a small beaker, Evap this to dryness and test part of the deposit white, in the case of BkPdr) with 1 drop of 1% DPhA soln in coned H2S04, using a white porcelain spot-test plate A blue color indicates the presence of a nitrate. Place another portion of the deposit in an indenture of a white porcelain spot-test plate, add an equal amt of cryst thymol and... 

Q. Thymol Reagent is prepd, right before use, by mixing crystalline thymol with coned HgSC. For testing an unknown substance... 

Tolulene, sodium azide, or thymol in a test tube or small bottle (optional)... 

Optional) Prevent microbial growth by placing a test tube or small bottle containing toluene, sodium azide, phenyl acetate, or thymol (for non-fatty products) inside the closed chamber to prevent mold growth on the sample at aw>0.75. 

---