[Determination of As, Sb, Bi, Cd and Sn in soils and sediments by inductively coupled plasma atomic emission spectrometry after sublimation separation as iodides].

A method was developed for the determination of As, Sb, Bi, Cd and Sn in degrees C, iodides of As, Sb, Bi, Cd and Sn were formed and sublimated from the sample matrix and then extracted by diluted HCl. The prepared solution was determined by ICP-AES. The sample treatment procedure, such as the ratio of NH4 I to sample, and sublimation and extraction conditions, was studied. The instrument determination parameters, including ICP power, Ar gas flow rate, spectral wavelengths, background subtraction, spectral interferences correction and internal standard, were selected and optimized. The established procedure is rapid and simple, the detection limits for the five elements are in the range of 0.01-0.35 microg x g(-1), and the analytical results for soil and sediment reference materials were in good agreement with the reference values.

[Determination of Si, Al and other in biological samples by ICP-AES with fusion with LiBO2 after dry ashing].

An alkaline sample digestion procedure using fusion with lithium metaborate (LiBO2) after dry ashing was developed. Silicon, aluminium and other, a total of 10 elements in different kinds of biological samples, were measured by ICP-AES. The detection limit of this method was 0.15 microg x mL(-1) for Si and 0.03 microg x mL(-1) for Al. The accuracy and precision of the method were demonstrated by analyzing certified reference materials poplar leaves (GBW07604). The precision was less than 3% and the accuracy was -0.03% for Si and -3% for Al. This method was applied to the certification of a series of ten biological reference materials. The results were satisfied.