Red iron test

Red Iron Test. See Vol 1, p XXIII, test c) under "SENSITIVITYTO FLAME, HEAT , etc... 

Red Iron Test is one of the US BurMines "Fire Resistance Tests. See under Sensitivity to Flame, Heat, Sparks, Etc... 

European matches, mosdy of brown or black tips, are basically identical with U.S. matches ia their formulations, except that they contain ia addition red iron oxide or manganese dioxide of pigment grade ia the match heads (2). Match materials, testing methods, and related matters have been reviewed (7,8). 

Test No 3 If the explosive withstands the Fuse Test, it is subjected to the Red Hot Iron Test described under Ignition Sensitiveness Tests Test No 4 Wood Fire Test In some cases, larger quantities, ie a pound or two, are burned in a wood fire to ascertain the degree of danger the explosive may offer in case of fire. Tne observations should be made under precautions at a safe distance. (Compare with Iron Box Test, described under Ignition Sensitiveness)... 

Sensitiveness to Ignition. The same tests are applied as given under Ignition Tests in this Vol. These include Fuse Test, Red Hot Iron Basin Test, and Red Hot Iron Test... 

Fire Resistance Tests. They include the tests described in Vol 1, pp XXII XXIII, under "SENSITIVITY TO FLAME, HEAT, SPARKS, ELECTROSTATIC DISCHARGES, ETC. The following tests were developed at die USBurMines a) Fuse Test Hemispherical Iron Dish Test and c) Red Hot Iron Test... 

Dimethylglyoxime reagent soluble red iron(II) dimethylglyoxime in ammoniacal solution. Iron(III) salts give no colouration, but nickel, cobalt, and large quantities of copper salts interfere and must be absent. The test may be carried out in the presence of potassium cyanide solution in which nickel dimethylglyoxime (cf. Section III.27, reaction 8) dissolves. 

Addition of thiocyanate ion to a solution of an iron(lll) salt produces a deep bloodred color of [Fe(H20)5(NCS)] +, which is used as a test for iron(III). This reaction has been extensively studied by fast reaction techniques. Dark red crystals of Fe(NCS)3 may be obtained by evaporation of ether after extraction of an aqueous solution containing iron(lll) and thiocyanate ion with a large excess of thiocyanate, salts of [Fe(NCS)4] can also be extracted into ether. Recrystallization of Fe(NCS)3 from water affords very soluble red Fe(NCS)3 3H2O. Bright red salts of [Fe(NCS)6] are known, for example, Na3 [Fe(NCS)6]. 12H2O, which is soluble in ethanol. Dark red iron(in) azide has a color similar to that of the thiocyanate, and is also a freely soluble salt. 

Sekine and Kato [81] agree with this soap formation mechanism. However, they have also tested several ferrite pigments in an epoxy binder, which is not expected to form soaps with metal ions. All of the ferrite-pigmented epoxy coatings offered better corrosion protection than both the same binder with red iron oxide as anticorrosion pigment and the binder with no anticorrosion pigment. Examination of the rest potential versus immersion time of the coated panels showed a lag time between initial immersion and passivation of approximately 160 hours in this study. The authors concluded that passivation of the metal occurs only after water has permeated the coating and reached the paint or metal interface [82]. The delay in onset of passivation could perhaps also be explained if, as in EBP, the protection... 

The thiocyanate ion SCN forms an intensely red-coloured complex (most simply represented as [Fe(SCN)(H20)5] ) which is a test for iron(III). However, unlike cobalt(III), iron(lll) does not form stable hexammines in aqueous solution, although salts containing the ion [FefNHj) ] can be obtained by dissolving anhydrous iron(III) salts in liquid ammonia. 

Dissolve a small portion of the sodium derivative in a few mi. of water in a test-tube, and add one drop of ferric chloride solution. A deep red coloration is produced, but rapidly disappears as the iron is precipitated as ferric hydroxide. The sodium (derivative (A) of the nitromethane wh dissolved in water undergoes partial hydrolysis,... 

Place 84 g. of iron filings and 340 ml. of water in a 1 - 5 or 2-litre bolt-head flask equipped with a mechanical stirrer. Heat the mixture to boiling, stir mechanically, and add the sodium m-nitrobenzenesulphonate in small portions during 1 hour. After each addition the mixture foams extensively a wet cloth should be applied to the neck of the flask if the mixture tends to froth over the sides. Replace from time to time the water which has evaporated so that the volume is approximately constant. When all the sodium salt has been introduced, boU the mixture for 20 minutes. Place a small drop of the suspension upon filter paper and observe the colour of the spot it should be a pale brown but not deep brown or deep yellow. If it is not appreciably coloured, add anhydrous sodium carbonate cautiously, stirring the mixture, until red litmus paper is turned blue and a test drop upon filter paper is not blackened by sodium sulphide solution. Filter at the pump and wash well with hot water. Concentrate the filtrate to about 200 ml., acidify with concentrated hydrochloric acid to Congo red, and allow to cool. Filter off the metanilic acid and dry upon filter paper. A further small quantity may be obtained by concentrating the mother liquid. The yield is 55 g. 

It is essential to use an excess of sodium, otherwise if sulphur and nitrogen are both present sodium thiocyanate, NaCNS, may be produced in the test for nitrogen it may give a red coloration with ferric iron but no Prussian blue since there will be no free cyanide ions. With excess of sodium the thiocyanate, if formed, will be decomposed ... 

Alkali or alkaline-earth salts of both complexes are soluble in water (except for Ba2[Fe(CN)g]) but are insoluble in alcohol. The salts of hexakiscyanoferrate(4—) are yellow and those of hexakiscyanoferrate(3—) are mby red. A large variety of complexes arise when one or more cations of the alkah or alkaline-earth salts is replaced by a complex cation, a representative metal, or a transition metal. Many salts have commercial appHcations, although the majority of industrial production of iron cyanide complexes is of iron blues such as Pmssian Blue, used as pigments (see Pigments, inorganic). Many transition-metal salts of [Fe(CN)g] have characteristic colors. Addition of [Fe(CN)g] to an unknown metal salt solution has been used as a quaUtative test for those transition metals. 

One test for the presence of iron(III) ions in solution is to add a solution of potassium thiocyanate, KSCN, and obtain the blood-red color of a compound of iron and the thiocyanate ion. Write three Lewis structures with different atomic arrangements for the... 

C20-0111. Oxyhemoglobin is bright red, but deoxyhemoglobin is blue. In both cases the iron is in the +2 oxidation state. Give a detailed explanation for the difference in color. How would you test your hypothesis Based on your explanation, what color would you predict for a sample of blood that is saturated with carbon monoxide ... 

Hematological Methods. Hematological analyses can Include the determination of the total hemoglobin concentration (In g%), the packed cell volume (PCV In %), the red blood cell count (In 10 /mm ) and reticulocytes count (In %), calculation of the red cell Indices, examination of a blood film, tests to demonstrate the presence of Inclusion bodies and of sickle cells, tests to evaluate the distribution of fetal hemoglobin (Hb-F) Inside the red cells, the red cell osmotic fragility, the concentration of serum Iron (SI), total Iron binding capacity (TIBC), and the survival time of the red cells. Details of all... 

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