Antimony compounds spectrophotometry

The compound is digested with nitric acid and the solution is analyzed for antimony by AA or ICP spectrophotometry (see Antimony). To determine the chlorine content a measured amount of substance is heated at 300°C and the liberated CI2 is passed into an acidic solution of KI and analyzed by iodomet-ric titration using a standard solution of sodium thiosulfate or phenyl arsine oxide and starch indicator. 

The compound is cautiously dissolved in nitric acid and the solution is appropriately diluted for the analysis of antimony by AA spectrophotometry or ICP emission spectrophotometry and fluoride ion is determined by ion—selective electrode or ion chromatography. 

The compound is treated with concentrated HCl H2S is hberated and is identified from its odor which also turns lead acetate paper black. The hberated H2S is transported onto a GC port by helium carrier gas and determined by an FID, TCD or FPD. Antimony in the solution may be analyzed by flame or furnace AA or by ICP spectrophotometry. The solid powder may be characterized by X—ray diffraction technique. 

Elemental composition In 48.53% Sb 51.47%. The compound may be analysed by x-ray analysis. Also, both indium and antimony may be measured by AA or ICP spectrophotometry after digestion with aqua regia. The metals may be measured nondestructively by x-ray fluorescence technique. 

Marr and coworkers have described a procedure for the microdetermination of antimony in organoantimony compounds by atomic absorption spectrophotometry. They compared air-acetylene and air-hydrogen flames and prefer the latter on account of the lower noise. The effects of varying instrumental and chemical parameters were also studied. 

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