oa Agrochemophysica - n Doeltreffendheidsondersoek met die A.R.L. hoe presisieveelbron*

Volume 2, Issue 1
  • ISSN : 0302-7112



An efficiency investigation with the A.R.L. high precision multi-source. An investigation was undertaken to determine the efficiency of the A.R.L. high precision multisource, consisting of a high voltage spark, and interrupted arc and a direct current arc. Sample introduction was achieved either by hollow electrodes or tape machine. Line intensity was recorded photographically and photo-electrically. A preliminary investigation of internal standards and buffer compositions (Table 2), was undertaken. Some of the results are represented in Fig. 1. On the basis of these results 0.5 per cent Sn as internal standard and graphite powder as buffer, were used. Synthetic standards were mixed with the buffer in a ratio of 1 : 10. Suitable excitation conditions (Table 3) were established. A direct-reading and photographic series of recordings were made and after statistical analysis, of which some results are shown in Fig. 2, calibration curves, reproduced in Fig. 3 an 4, were drawn. By comparing sensitivity and precision data, summarized in Table 4, it was found that the spark and interrupted arc excitation conditions with the tape machine were the most efficient. A favourable comparison between direct-reading and photographic efficiencies was found. Due to the higher speed of analysis, spectrometry determinations are preferable to spectrographs.

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