Chromate , barium

The classical analytical method of deterruination of barium ion is gravimetric, by precipitating and weighing insoluble barium sulfate. Barium chromate, which is more insoluble than strontium chromate in a slightly acidic solution, gives a fairly good separation of the two elements. 

Chromium (VI) compounds (with the exception of barium chromate and of compounds specified elsewhere in the Approved Supply List)... 

See Aluminium, etc., Boron, etc. and Barium chromate, etc., all above See other frictional initiation incidents, static initiation incidents See also thermite reactions... 

The finely divided metal may ignite in contact with a range of oxidants, usually on heating [1], Mixtures of the metal powder with barium chromate and potassium chlorate are used as a pyrotechnic fuse [2],... 

Due to the large thermal expansion mismatch between barium chromate and the sealing glass or FSS (e.g., AISI446) [213], the extensive formation of barium chromate has been shown to result in crack initiation and growth between the sealing glass and alloy coupons. 

Many barium aluminosilicate-based compositions will eventually react with the chromium oxide or aluminum oxide scales on the metal interconnect or metal edge rails to form barium chromate or a celsian phase at the interface [6], This can cause a mechanical weakness that is easily delaminated. Also, compositions that contain boron can react over time with water (steam) to produce B2(OH)2 or B(OH)3 gas. This can decompose the glass and greatly limit the lifetime of the seal. Thus many of the new investigations have emphasized low or no boron glass compositions. 

The formation of barium chromate often leads to the physical separation of the sealing glass and the metal alloy due to barium chromate s high thermal expansion. Along interfacial regions where oxygen or air access is blocked, chromium or chromia can react with barium-calcium-aluminosilicate (BCAS) glass-ceramic to form a chromium-rich solid solution and a series of pores. 

Barium chlorate monohydrate, 6 116 Barium chloride, 3 362 acute lethal dose, 3 372t Barium chloride dihydrate, 3 362 Barium chromate(V), physical properties, 6 528t... 

Barium chromate is used as a pigment in paints, ceramics, coloring glasses, fuses, and porcelains as a corrosion inhibitor to prevent elecrochemical corrosion at the joints of dissimilar metals in safety matches in metal primers in ignition control devices in pyrotechnic compositions and as an initiator for explosives. 

Barium chromate is a toxic substance and an EPA-confirmed human carcinogen. 

Ammonium nitrate Ammonium perchlorate Barium chlorate (hydrate) Barium chromate Barium nitrate Barium peroxide Iron oxide Iron oxide Lead chromate Lead oxide (red lead) Lead peroxide Potassium chlorate Potassium nitrate Potassium perchlorate Sodium nitrate Strontium nitrate... 

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