There is a very good procedure using a Na peroxide sinter in a Zr metal
crucible. This has been used for mass production decomposition for
multi-element ICP-AES and MS for many years in geoanalytical laboratories,
particularly in the BRGM in France. Tens of samples can be decomposed and
dissolved in a single day.
0.5 mg sample plus 2 g Na peroxide and 0.25 g Na-carbonate are mixed with a
teflon rod in a graphite or Zr crucible. The mixture is sintered at 480 o C
for 45 minutes. After cooling, the crucible is placed into a plastic beaker
containing about 10 ml water. 5 ml boiling water is added and stirred. Wait
until the sintered mass is free from the crucible, rinse it with water. The
mixture is transfered to another beaker containing 25 ml nitric acid (or 6
N HCl). Rinse the crucible with a little conc nitric aid. Make up to volume
of 100 ml, add Sc solution so than 5 ppm. A fourfold peroxide is usually
sufficient for the decomposition of most mineral and rocks.
At 13:22 6/10/98 +0200, you wrote:
>We have to prepare soil samples for analysis by ICP-AES. We use a H3BO3 fusion
>method for digestion.
>The problem is that we have to prepare several hundred samples, so we are
>looking for an instrument to automatically prepare the fusions. Since we have
>several hunderd samples to prepare we are interested in a device that can fuse
>as many samples at the same time as possible.
>Does anybody have information (addresses, url) of manufacturers of such
>Any information is appreciated.