Samples for the Interlaboratory Study

The participating laboratories received two sets of solutions containing respectively ca. 50 and 5 pg of TriML. They were requested to perform five replicate analyses of  

Two sets of simulated rainwater solutions were prepared with the composition listed in Table 6.3. Aliquots of solution (100 mL) were transferred into 18 100 mL Nalgene bottles for each of the samples. The bottles were wrapped with aluminium foil, and then sealed in plastic bags. 

The ETAAS technique did not include a separation step but the participant mentioned that EDTA extraction would only extract organic lead compounds this technique was considered to be suitable for the analysis of a simple solution containing only one lead compound but would not be adapted to mixtures of lead species, e.g. the techniques would not allow for the separation of TriML and TriEL in a natural rainwater sample. In case organolead compounds should be determined in natural samples or solutions containing different lead compounds, ETAAS should be coupled to a separation technique, e.g. GC or HPLC. 

Some doubts were expressed on the DPASV results obtained, considering the low standard deviation, and the analysis was repeated with a well conditioned electrode. The new set of data was (6.52 0.22) pg kg .  

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Subtask 6 Start-up. The Subtask 6 start-up activities are primarily devoted to define 1) technical scope in terms of powder properties to be studied 2) inclusion of powders 3) inclusion of Japan as a participating country 4) tightening of procedures 5) preparation of samples for the interlaboratory study. 

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