Triethylaluminium determination

Often a suitable potentiometric indication for Lewis titrations is not available, whereas a conductometric indication can still be applied a well known example is the Bonitz titration29 of triethylaluminium (Et3Al) with an azine, such as isoquinoline, for determination of active alkylaluminium in the precatalysts of the Ziegler synthesis of polyethene or polypropene beyond the titration parameter A of the 1 1 complex, the conductivity suddenly decreases,... 

The procedure was applied to the determination of ethyl and butyl groups in a sample of distilled diethylzinc. This material contained some aluminium impurity originating in the triethylaluminium used in its preparation. The results obtained are presented in Table 6. 

The lauric acid decomposition chromatographic method is not restricted to triethylaluminium. It can also be applied successfully to other alkylaluminium compounds, provided that for the purpose of determining the ratio of hydrogen to the main hydrocarbon component of the gas mixture the column packing and carrier gas are adapted to the molecular weight of the alkylaluminium compound to be analysed (see Table 45), A supplementary calibration of the apparatus for the decomposition gases concerned is then necessary. All the alkylaluminium compounds listed below were analysed... 

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