Atomic spectro-chemical analysis can be classified into absorption and emission techniques. The Atomic absorption spectrometry (AAS) has gained overall acceptability as a viable analytical tool because of its simplicity. The technique has serious limitations such as low quantum of analysis, low source temperature, highly reactive atom reservoirs, absorption due to non-atomic processes, matrix effects etc.
As such it is difficult to analyse refractory oxide forming elements by AAS. The arc spectrography lacks reproducibility and sensitivity for trace element analysis. The technique also requires carefully prepared and characterized standards for each alloy system. Availability of standard reference materials is limited to few systems. The technique also has serious matrix effects such as grain size, crystal structure, orientation etc. Solution route offers distinct advantages and therefore, ICP-OES has an edge over many spectrometric techniques. The inductively coupled plasma (ICP) is an argon plasma maintained by the interaction of an RF field and ionized argon gas. The plasma has temperature as high as 10,000oK, when the sample is aspirated into the plasma; such high temperatures completely atomize the elements present in the sample. In ICP-OES synthetic standards can be used for analysis however, at Minex we always try to match the matrix of the sample for better accuracy.
The Minex Analytical Laboratory can undertake elemental analysis of
by ICP-OES. We can analyze about 74 elements starting from Li (Z=3) to U (Z=92). We can analyze from ppb to percentage levels.
At our Laboratory it is standard practice to first measure the 'Dark current' prior to any analysis, to ensure that there is no stray light causing any interference. The emission lines are chosen very carefully so as avoid any partial or total overlap from other element. If it is not possible to select a totally free line then inter-elemental correction factors (IECs) or more sophisticated techniques such as multi component spectral fitting (MSF) is used. In all cases the Laboratory of Minex Metallurgical Co Ltd uses multi-elemental, matrix matching standards for analysis. Detection Range from ICP: