Lead azide chromate

Lead arsenates, 74 797 Lead azide, 70 727-729 74 792 Lead babbitt, 3 52, 52t arsenic addition to, 3 271 Lead-base babbitts, 24 797 Lead-based paint, 74 765 Lead-based paint remediation, 18 75 Lead-based pigments, 79 386. See also Lead chromate pigments Lead benzoate, 74 794 Lead bisilicate, 74 796 Lead blast furnace, 74 737 Lead borate, 74 797 Lead bromide, 74 785 Lead bullion, 74 742, 745... 

Amm acetate soln and add sufficient Na bichromate soln to ppt all lead as chromate. Test for the completion of destruction by transferring a portion of slurry to a filter paper and treating the filtrate with a few drops of Na bichromate soln. Confirm the absence of LA by washing.with distd w,the residue on filter,free of so azide salts, drying it,and subjecting a 20 mg portion to the impact test, using 2 kg wt. The material should not detonate... 

Lead azide is dissolved by an aqueous solution of ammonium acetate, but it is not destroyed by it. The solution contains azide ions and lead ions, the latter quantitatively precipitable as lead chromate, PbCr04, by the addition of potassium dichromate solution. Lead azide in aqueous suspension is oxidized by ceric sulfate with the quantitative production of nitrogen gas which may be collected in an azotometer and used for the determination of the azide radical. 

LEAD CHROMATE or LEAD(II) CHROMATE (7758-97-6) PbCr04 Noncombustible solid. Violent reaction with sulfur, iron(III) ferrocyanide, azo-dyes. Forms unstable, impact-sensitive and/or pyrophoric mixtures with hydrozoic acid, sodium azide, sulfur, tantalum, trinitrobenzoic acid. Incompatible with azo dyes, ammonia, hydrazine, methyl isocyanoacetate, sodium peroxyborate, urea nitrate. A known human carcinogen. 

Lead(II) azide Lead chromate Lead dioxide Calcium stearate, copper, zinc, brass, carbon disulfide Iron hexacyanoferrate(4-) Aluminum carbide, hydrogen peroxide, hydrogen sulfide, hydroxylamine, ni-troalkanes, nitrogen compounds, nonmetal halides, peroxoformic acid, phosphorus, phosphorus trichloride, potassium, sulfur, sulfur dioxide, sulfides,... 

It is therefore recommended to add sodium nitrite solution before using acid for destruction of unwanted LA (or also sodium azide) residues in the laboratory or even in industrial applications [3, 5, 21]. Urbahski recommends the use of 8 % solution of sodium nitrite and 15 % nitric acid for LA [30], whereas 92 % sulfuric acid is recommended for sodium azide [5]. Many other reactions have been proposed for the decomposition of LA, including reaction with sodium polysulfide [21] or dissolving LA in ammonium acetate and adding sodium or potassium bichromate until no more lead chromate precipitates [5],... 

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