Spectrophotometry Determines Tungsten Trioxide

Spectrophotometry is a method of ualitative and quantitative analysis of testing substance the absorbance or emission intensity of in a specific wavelength or range of wavelengths of light .In the quantitative analysis, the first need to a solution for absorption is different wavelengths of light (absorption spectrum), which determines the maximum absorption wavelength, then this wavelength of light can be as the light source, a series of known concentrations measured absorbance c solution A, making A ~ B curve. Due to the large number of new synthetic coloring agents, making the element sensitivity of the assay in the progress, especially applied research related to multicomponent complex and various surface active agents, in which many molar extinction coefficients of elements from the original raises to tens of thousands to hundreds of thousands.

Spectrophotometric method is widely used in the detection of tungsten trioxide in geological rock minerals. In the experiment, the spectrophotometric instrument is generally 721. Reagents normally are solid sodium peroxide, sodium hydroxide, hydrochloric acid solution. In hydrochloric acid (HCL) medium, using thiocyanate as the reducing agent, putting it in a high temperature of about 700 ℃ for melting,, and after cooling into 250ml beaker of hot water, after boiling and cooling, diluting into 100ml bottles, mixing to a certain scale. 20g of sodium hydroxide solution is added to HCL, after adding 4ml250g / LKSCN solution continue mixing and shaking, then adding 20ml hydrochloric acid, diluting with water to a certain moment, after ten minutes, we can have absorbance measurements. By spectrophotometry, generating a stable yellow-green complex with a tungsten content of the solution is clear reference solution; the absorbance of the solution is measured at a wavelength of 400nm.

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