(c) Copyright Oxford University Press, 2013. Read what you need to know about our industry portal chemeurope.com. Cobalt Thiocyanate, also known as Cobalt (II) thiocyanate, is an inorganic compound of cobalt and is best known for the cobalt thiocyanate test (or Scott test), which is a proven screening test for the presence of cocaine. Step 1: addition of cobalt thiocyanate, in the presence of cocaine, will form blue crystals (i.e. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription. Ten drops of chloroform (or similar solvent) are then added, and the tube is vortexed, then allowed to settle and separate into two layers. Cobaltous thiocyanate | C2CoN2S2 | CID 18174 - structure, chemical names, physical and chemical properties, classification, patents, … Cobalt thiocyanate. To increase the specificity of the test, a variation called the Scott or Ruybal test has been used in which three reagents are employed. Under the terms of the licence agreement, an individual user may print out a PDF of a single entry from a reference work in OR for personal use (for details see Privacy Policy and Legal Notice). If you have purchased a print title that contains an access token, please see the token for information about how to register your code. Cobalt thiocyanate: Cobalt thiocyanate, distilled water, glycerin, hydrochloric acid, chloroform : … Cobalt Thiocyanate Reagent, Scott's test Cobalt thiocyanate in aqueous solution and stannous chloride in aqueous solution. The author describes the reagent preparation. A standard drink in defined as a 12 ounce beer, 4-6 ounces of table wine, or 1 ounce of hard liquor (~100 proof). Thiocyanic acid, cobaltsalt (8CI,9CI) Cobalt(II) thiocyanate, 99.9% trace metals basis This compound may be prepared by the salt metathesis reaction of aqueous cobalt(II) sulfate and barium thiocyanate; barium … Diphenhydramine and lidocaine also give blue organic layers. PRINTED FROM OXFORD REFERENCE (www.oxfordreference.com). EC Number 221-156-8. In the first step, cobalt thiocyanate is added and blue precipitates appear. Linear Formula Co(SCN) 2. Cobalt(II) thiocyanate 99.9% trace metals basis Synonym: Bis(thiocyanic acid)cobalt(II) salt, Cobaltous thiocyanate, Isothiocyanic acid cobalt(II) salt CAS Number 3017-60-5. You could not be signed in, please check and try again. It still began with cobalt thiocyanate. Mikrochimica Acta 1983 , 80 … The final color of the chloroform (organic) layer is recorded. Selected Forensic Professional Organizations. © 1997-2021 LUMITOS AG, All rights reserved, https://www.chemeurope.com/en/encyclopedia/Cobalt_thiocyanate_test.html, Your browser is not current. When this is added to cocaine powder, a blue solid (blue precipitate) is formed. Cobalt(II) thiocyanate. These compounds are known false positives for cocaine. Preparation of Spot Test Reagents Marquis (210 mL): Add 10 mL of 40% formaldehyde solution to 200 mL of concentrated sulfuric acid. The cobalt thiocyanate test is performed by placing approximately 2 to 4 milligrams of a target substance in a glass test tube, then 5 drops of cobalt thiocyanate reagent. In this present work, the capability and structure determination of a cobalt thiocyanate complex—stabilized by glycerol —which detects cocaine (acid and base) in samples without interfering with cutting substances are studied by a TLC method. Cobalt(II) thiocyanate is an inorganic compound with the formula Co(SCN) 2 (H 2 O) 3.It is a coordination complex that is used in the cobalt thiocyanate test (or Scott test) for detecting cocaine.The test has been responsible for widespread false positives and false convictions. It is a layered coordination complex and its trihydrate Co(SCN) 2 (H 2 O) 3 is used in the cobalt thiocyanate test (or Scott test) for detecting cocaine.The test has been responsible for widespread false positives and false convictions. The reagent will form an insoluble ion pair in the presence of cocaine which precipitates out as a silvery turquoise blue solid. The color change is a presumptive indication of what the unknown could be. It is a layered coordination complex and its trihydrate Co(SCN)2(H2O)3 is used in the cobalt thiocyanate test (or Scott test) for detecting cocaine. Cocaine HCl will develop a Blue solution in the 1st ampoule as well as a sticky Blue residue adhering to the inside of the tube. To use all the functions on Chemie.DE please activate JavaScript. Using only 2% cobalt (II) thiocyanate, 5% stannous chloride and Sanchez reagent (5% furfural in a 5% acetic acid solution), determine how you would distinguish between the following drugs: cocaine HCl, tetracaine HCl, procaine HCl, benzocaine. 3017-60-5. Please subscribe or login to access full text content. To use all functions of this page, please activate cookies in your browser. It uses reagents commonly used in forensic drug analysis. 6799AF. PubChem Substance ID … The 2nd ampoule will remain Blue. Cobalt(II) thiocyanate is an inorganic compound of cobalt.It is best known for the cobalt thiocyanate test (or Scott test), which is a proven screening test for the presence of cocaine.. Scott’s final formulation was a three-step test. Find out more about the company LUMITOS and our team. Amphetamines will turn it orange-brown. During investigation of the mechanism and specificity of the Scott's (cobalt(II) thiocyanate) test for cocaine, it was discovered that the ambient temperature affected the equilibrium between the pink (negative) and the blue (positive) test results. For questions on access or troubleshooting, please check our FAQs, and if you can''t find the answer there, please contact us. Give at least two examples of drugs that fluoresce under UV light. The two‐step procedure for liquids and three‐step procedure for powdered samples are straightforward, definitive, and utilize reagents commonly used in forensic drug … Wikipedia article "Cobalt_thiocyanate_test", Amanda J. Hanson "Specificity of the Duquenois-Levine and Cobalt Thiocyanate Tests Substituting Methylene Chloride or Butyl Chloride for Chloroform. Taking cobalt as a first row transition metal , and with the hard-soft acid-base theory which indicates that the cobalt forms hard acid bonds with the nitrogen which is a hard base , the variation of the thiocyanate precursor material’s ligand on final complexes has been evaluated. With color spot tests, a portion of an unknown powder/residue/crushed tablet is combined with a chemical reagent which may produce a color change. The test is a modification of the cobalt thiocyanate test currently used for cocaine and involves basifying samples rather than acidifying them. The test has been responsible for widespread false positives and false convictions. New spot test for cobalt detection. Organic compounds containing the functional group SCN are also called thiocyanates. The reagent will form an insoluble ion pair in the presence of cocaine which precipitates out as a silvery turquoise blue solid. Cocaine HCl will develop a Blue solution in the 1st ampoule as well as a sticky Blue residue adhering to the inside of the tube. Addition of 10 drops of chloroform, vortexing, and allowing the solution to settle results in a blue organic layer for both cocaine hydrochloride and cocaine base. A blue reaction signaled the suspect drugs might be cocaine. J Appl Pharm 10: 265. doi: 10.4172/1920-4159.1000265 Page 3 of 8 oe e 3 265 Pa a oe ae oa 245 Conc. Cobalt thiocyanate is used to test for cocaine. Ninety-four … Cobalt(II) thiocyanate is an inorganic compound with the formula Co(SCN) 2. NOTE: ALL TEST RESULTS MUST BE CONFIRMED BY AN APPROVED … Mercury(II) thiocyanate was formerly … Thiocyanate (also known as rhodanide) is the anion [SCN] −.It is the conjugate base of thiocyanic acid.Common derivatives include the colourless salts potassium thiocyanate and sodium thiocyanate. Step 2: addition of hydrochloric acid, in the presence of cocaine, the blue crystals … In the testing, a two-step procedure for liquids and a three-step procedure for powdered samples were used. The Sirchie NARK Modified Cobalt-Thiocyanate Reagent is a more specific field test for Cocaine and will distinguish between Cocaine HCl and Cocaine Base. Type of Test: Chemicals: What the Results Mean: Marquis Color: Formaldehyde and concentrated sulfuric acid : Heroin, morphine and most opium-based drugs will turn the solution purple. The modified version of the Cobalt Thiocyanate is a more specific field test for Cocaine and will distinguish between Cocaine HCl and Cocaine Base. Other tests use three tubes, which the officer can break in a specific order to rule out everything but the drug in question — but if … Most of them are based on complexation of the alkaloid with cobalt(II) thiocyanate (Co(SCN) 2 (H 2 O) 4) … A procedure has been developed for the application of the reaction as a micro-and macro test for cobalt. Ferric iron can be made harmless by addition of an excess of fluoride. If cocaine is present, addition of the first reagent will cause the blue precipitate to form and the addition of the second will cause the blue to turn to a clear pink colour. Cobalt(II) thiocyanate is an inorganic compound with the formula Co(SCN)2. If a sample contains cocaine, the reactions will go as follows. MDL number MFCD00010937. Cupric copper gives a sensitive reaction and … After shaking, 1 or 2 drops of concentrated hydrochloric acid (other acids can be used [2] ) are added, and the tube is again shaken. But cobalt thiocyanate also turns blue when it is exposed to more than 80 other compounds, including methadone, certain acne medications and several common household cleaners. Structure and … Acidified Cobalt Thiocyanate (Scott's) (500 mL): Reagent #1: Add 3.5 grams of cobalt thiocyanate to 175 mL of deionized (DI) water (2% solution). For Sale to Law Enforcement Only! Find out how LUMITOS supports you with online marketing. The cobalt thiocyanate test is performed by placing approximately 2 to 4 milligrams of a target substance in a glass test tube, then 5 drops of cobalt thiocyanate reagent. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE. Alkali-thiocyanate is a sensitive reagent for the detection of cobalt in presence of 40 to 50% acetone. ". In the first, the reagent is prepared by dissolving cobalt thiocyanate (CoSCN) in distilled water, sometimes with additional ingredients such as ammonium thiocyanate or glycerine. HCl was added followed by the addition of two drops of Cobalt thiocyanate reagent whereas in the sample tube, a pinch of test powder was placed in sample tube and added one … Categories: Analytical chemistry | Chemical tests. Hexamethylphosphoramide (HMPA) as a colour-enhancing agent for the thiocyanate cobalt complex. The first is a cobalt thiocyanate solution containing glycerine, the second is a hydrochloric acid solution, and the third is chloroform, an organic solvent that does not mix with water. Various field tests are used to identify cocaine/crack in apprehended street samples. Calculate the number of standard drinks in the subjects system when the test was given. Addition of the cobalt thiocyanate reagent to cocaine hydrochloride results in the surface of the particles turning a bright blue (faint blue for cocaine base). Upon heating the oxide Co 3 O 4 is formed, and if the reaction is carried out above 900°C, the result is cobalt(II) oxide, CoO. Molecular Weight 175.10 . The test has been responsible for widespread false positives and false convi CTK4C2061. The Cobalt is mixed with the questionable substance, then drowned in hydrochloric acid, doused in chloroform, and shaken. Your browser does not support JavaScript. The test consists of three steps, each involving the addition of a certain reagent and observation of the color that develops as a result. The subject has a body weight of 150 pounds. Molecular Weight 175.10 . You have access to this article. 10 tests/box. EC Number 221-156-8. Linear Formula Co(SCN) 2. precipitates). Additional recommended knowledge. After shaking, 1 or 2 drops of concentrated hydrochloric acid (other acids can be used[1]) are added, and the tube is again shaken. Cobalt(II)thiocyanate. Cobalt Thiocyanate as Reagent. The cobalt thiocyanate reagent can be prepared by dissolving ten grams of cobalt (II) thiocyanate in a mixture of 490 milliliters of distilled water and 500 milliliters of glycerin . The 2nd ampoule will remain Blue. Preparation. The Scott test involves three steps. Cobalt(II) thiocyanate, 96%. 1. The #NAR10013 Modified Cobalt Thiocyanate Reagent is a more specific test for Cocaine. cobalt thiocyanate test (Ruybal test) A *presumptive test used principally for cocaine, although the reagent will react with other drugs. The cobalt thiocyanate test (or Scott test) is a proven screening test for the presence of cocaine. MDL number MFCD00010937. The cobalt thiocyanate reagent can be prepared by dissolving ten grams of cobalt (II) thiocyanate in a mixture of 490 milliliters of distilled water and 500 milliliters of glycerin. Summary: The Scott test is a popular field test for field identification of cocaine and crack. It is best known for the cobalt thiocyanate test (or Scott test), which is a screening test for the presence of cocaine. The test reads a value of 0.16 grams of ethyl alcohol/210 liters of breath. Cobalt does not react readily with air. Abstract. In Harris County, Texas, the prosecutor's office identified hundreds of … ... Access to the complete content on Oxford Reference requires a subscription or purchase. There are three common variations of the test. Adding the final reagent, chloroform, will cause two layers to form in the test tube, the aqueous layer (the water-based solution), and the chloroform layer. Like all our NARK narcotic field tests, the Cobalt-Thiocyanate Reagent is meant for presumptive field drug testing. The new test is a modification of the standard cobalt thiocyanate (CoSCN) test for cocaine. The cobalt thiocyanate test (or Scott test) is a proven screening test for the presence of cocaine. PubChem Substance ID 24852801. All Rights Reserved. C2CoN2S2. A *presumptive test used principally for cocaine, although the reagent will react with other drugs. If cocaine is present, a blue colour will reappear in the chloroform layer.... NACRES NA.23 Cobalt(II) thiocyanate 96% Synonym: Bis(thiocyanic acid)cobalt(II) salt, Cobaltous thiocyanate, Isothiocyanic acid cobalt(II) salt CAS Number 3017-60-5. For example, the color test for cocaine is Cobalt Thiocyanate; addition of cocaine will produce a … At 4 O C (~39 O F) the sensitivity of the test was doubled versus room … There are three common variations of the test. The solution changes back to pink upon adding one or two drops of hydrochloric acid and mixing. 3 Co (s) + 4 O 2 (g) 2 Co 3 O 4 (s) 2 Co (s) + O 2 (g) 2 CoO (s) Cobalt does not react directly with nitrogen, N 2. Cobalt(II) thiocyanate is an inorganic compound of cobalt. With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter. Identification of cocaine and crack step 1: addition of cobalt in of... Thiocyanate ( CoSCN ) test for cocaine and will distinguish between cocaine and... 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