Picrates

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Related to picrate: picric acid, Ammonium picrate

Picrates

 

salts of picric acid, or 2,4,6-trinitrophenol. Metal picrates are crystals ranging from yellow to red in color; Li and Na salts are moderately soluble in water, whereas salts of K and heavy metals, such as Pb, Cu, and Ca, are poorly soluble. Pi-crates are obtained by the action of metal hydroxides or carbonates on picric acid solutions, as well as by exchange reactions between barium or lithium picrates and the sulfates or nitrates of some metals, most often Pb.

Picrates are highly sensitive to mechanical effects and are readily inflammable and quick-burning explosives (the combustion rates for magnesium, potassium, and lead picrates at a pressure of 5 meganewtons per sq m, or 50 kilograms-force per sq cm, are 1.2, 3.5, and 21 cm sec, respectively). They have high thermal stability (particularly potassium and magnesium salts).

Organic bases are often isolated from mixtures and identified in picrate form. The term “picrates” is also used to designate complexes formed for aromatic hydrocarbons and picric acid.

References in periodicals archive ?
Determination of total cyanide in bamboo shoot was done with a modification of Picrate paper kit procedure.
Serum creatinine was measured on a Dimension Vista system clinical chemistry analyzer (Siemens) with an assay using a modification of the kinetic Jaffe reaction (alkaline picrate reaction).
Blood Creatinine ([micro]mol/1): Creatinine reacted with picric acid in presence of an alkah to form orange-red colour of creatinine picrate. Proteins in the blood were precipitated with tungstic acid.
The concentration of protein in the urine was determined by the turbidimetric method with benzethonium chloride, and the level of creatinine was determined by the Jaffe method with alkaline picrate, all by means of commercial kits (Abbott, Wiesbaden, Germany) on the biochemical analyzer ci4000 Architect.
In this method creatinine present in the sample reacts with alkaline picrate forming a reddish complex and the intensity of the color thus produced is measured at the wavelength of 510nm which is proportional to the creatinine concentration present in the sample.
Tenders are invited for Creatinine For Auto-Nanlyzer Two Point Chemistry, Without Deproteinization Alkaline Picrate Method , With Standard, Incubation Time Less Than Or Equal To 8 Min, Flowcell Temprature 37Degree Centigarde, With Programe Sheet For Olympus Au-400 Pack Size - 1000Ml Or Equivalant
Biochemical Assay: Blood urea and creatinine level were estimated by Direct Colorimetric method using Diacetyl Monoxime Reagent and Alkaline Picrate Method as described by McLauchlan DM.
Total cyanide determination of plants and foods using the picrate and acid hydrolysis methods.
Serum creatinine was measured with the architect C 16000 (Abbott) device by using the kinetic alkaline picrate method at the biochemistry laboratory of the hospital.
At the end of the experiment, blood plasma was thawed at room temperature and analyzed to determine urea, following modified diacetyl method, with picrate and acidifier.
In this method, creatinine reacts with picrate to form a coloured complex and the rate of formation of the complex is measured photometrically at 492 nm.