Microwave digestion, FAAS analysis

Table 8.22 shows some rubber analyses by FAAS after dry ashing. The concentration of Rh in polymers was measured by FAAS [128], The accuracy of 10-20% was in agreement with a dissolution procedure the precision obtained for direct solid analysis was between 10 and 20 %. Due to the relatively high analyte content of lead in paint, the determination is mostly performed by FAAS. Typical digestion procedures include dry ashing, wet and microwave digestion. 

Comparison of the results of analysis by FAAS of the solutions produced by each of these methods indicated that procedures 1 and 3 were preferable to the others with respect to precision and accuracy. Procedure 1 was less accurate for chromium than procedure 3. In addition, procedure 3, which employed microwave digestion, took considerably less time to complete. Method 4, the leaching process, produced acceptable results only for Fe, Mg, Zn, and Cu. 

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