… The test has been responsible for widespread false positives and false convictions. tests; cobalt thiocyanate for cocaine, Duquenois–Levine for marijuana, Marquis for many basic drugs and para-dimethylaminobenzaldehyde (p-DMAB) for LSD. Today safety awareness rises and many companies banned the use of Zinc Zap due to the toxic nature of N,N-diethylaniline. The field tests seem simple, but a lot can go wrong. 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 … [1] Co(SCN)2 forms infinite 2D sheets in the mercury(II) thiocyanate structure type, where as Co(SCN)2(H2O)3 consists of isolated tetrahedral Co(SCN)2(H2O)2 centers and one equivalent of water of crystallization. Detailed procedures for the cobalt thiocyanate test are available. For Sale to Law Enforcement Only! The Scott test involves three steps. Alkali-thiocyanate is a sensitive reagent for the detection of cobalt in presence of 40 to 50% acetone. 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.. [4], The hydrate may be prepared by the salt metathesis reactions, such as the reaction of aqueous cobalt(II) sulfate and barium thiocyanate to produce a barium sulfate precipitate, leaving the hydrate of Co(SCN)2 in solution:[4], or the reaction of the hexakisacetonitrile cobalt(II) tetrafluoroborate and potassium thiocyanate, precipitating KBF4, The anhydrate can then be prepared via addition of diethylether as an antisolvent. The reagent consists of 2% cobalt thiocyanate dissolved in dilute acid. 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. Lithium-ion batteries contain cobalt. What you see is a mixture of this ion and various other cobalt(III) ions involving ligand exchange reactions with both water molecules and … Linear Formula Co(SCN) 2. Similar to cocaine, diphenhydramine (the active ingredient in Benadryl) reacts with cobalt thiocyanate to form a blue product. Cobalt thiocyanate is an inorganic compound made from cobalt. Not a specific field test for Cocaine only. Abstract 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. For instance, cobalt is an essential component of vitamin B12. Cobalt(II) thiocyanate is an inorganic compound with the formula Co(SCN)2. C2CoN2S2. In fact, one of the characteristic tests for thiocyanate ions is the same reaction that we discussed over there. Cobalt(II)thiocyanate. Cobalt(II) thiocyanate 96% Synonym: Bis(thiocyanic acid)cobalt(II) salt, Cobaltous thiocyanate, Isothiocyanic acid cobalt(II) salt CAS Number 3017-60-5. Thiocyanic acid, cobaltsalt (8CI,9CI) Cobalt(II) thiocyanate, 99.9% trace metals basis The test has been responsible for widespread false positives and false convictions. 9. With ferric ions, thiocyanate ions give a blood red coloration of Fe(SCN) 3. The reagent consists of 2% cobalt thiocyanate dissolved in dilute acid. The principal behind color tests is based on the fact that classes of ... Reagent #1: Add 3.5 grams of cobalt thiocyanate to 175 mL of deionized (DI) water (2% solution). Cocaine turns blue with the first solution and with the third solution. Madelin reagent- Alternate test … [2][3], The structures of Co(SCN)2 and its hydrate Co(SCN)2(H2O)3 have been determined using X-ray crystallography. Step 1: addition of cobalt thiocyanate, in the presence of cocaine, will form blue crystals (i.e. However, the test was previously associated with false positives and false convictions. [4], The hydrate may be prepared by the salt metathesis reactions, such as the reaction of aqueous cobalt(II) sulfate and barium thiocyanate to produce a barium sulfate precipitate, leaving the hydrate of Co(SCN)2 in solution:[4], or the reaction of the hexakisacetonitrile cobalt(II) tetrafluoroborate and potassium thiocyanate, precipitating KBF4, The anhydrate can then be prepared via addition of diethylether as an antisolvent. Morris JA (2007) Modified cobalt thiocyanate presumptive color test for ketamine hydrochloride. It still began with cobalt thiocyanate. (1994) Rapid Testing Methods of Drugs of Abuse: Manual for use by Narcotics Laboratory Personnel. The solution changes back to pink upon adding some hydrochloric acid. After shaking, 1 or 2 drops of concentrated hydrochloric acid (other acids can be used) are added, and the tube is again shaken. precipitates). These tests also are only for testing for drugs in solid form and are not used to detect drugs in the blood or urine. Cobalt Thiocyanate Test. Madelin reagent- Alternate test … These same Blue flakes will slightly dissolve after breakage and agitation of the 2nd ampoule. Step 1: addition of cobalt thiocyanate, in the presence of cocaine, will form blue crystals (i.e. Molecular Weight 175.10 . NOTE: ALL TEST RESULTS MUST BE CONFIRMED BY AN APPROVED ANALYTICAL LABORATORY! 7. Why are police departments and prosecutors still using them? Diphenhydramine and lidocaine also give blue organic layers. These compounds are known false positives for cocaine. Thiocyanate is analogous to the cyanate ion, [OCN] −, wherein oxygen is replaced by sulfur. These same Blue flakes will slightly dissolve after breakage and agitation of the 2nd ampoule. The cobalt-thiocyanate test also turns blue for PCP and is used as a field test for it. Cupric copper gives a sensitive reaction and must be removed. The presence of a blue precipitate is a positive test for cocaine. [1] 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. Cobalt(II) thiocyanate. • This test must be carried out in acidic solution to form the protonated cocaine molecule. Lidocaine is commonly used to adulterate or mimic cocaine due to its local anaesthetic effect. J Forensic Sci 52(1): 84-87. Summary: The Scott test is a popular field test for field identification of cocaine and crack. Sensitive reaction and must be CONFIRMED by an APPROVED ANALYTICAL Laboratory positive test for cocaine and crack use and... 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