Elemental composition of gel and product

Table IV. Elemental Compositions of Gel and Product for Typical MeAPO-36 (T0Z Formula, Anhydrous Basis)...

The X-ray diffraction patterns of the AlPO and CoAPO samples indicate pure phases, except for some samples of CoAPO —34, which might contain amorphous material. However, in view of the product compositions (Table 1) it must be concluded that many samples are not pure since the (Al+Co)/P ratio is considerably greater than 1. In these cases, part of the aluminium and/or cobalt must be present in extra-framework species. In particular, samples prepared with high cobalt concentrations in the gel and samples of CoAPO -34 exhibit unfavourable element ratios. These samples are also often less homogeneous in that they can contain white particles, whereas the major phase exhibits a blue colour. 

Fig. 3. Mol% element plot of ATEM compositional data for cement paste gel and cement/mineral reaction products in Hadrian s Wall.

ToF-SIMS is also useful in revealing surface degradation products [827] and in morphological studies of multiphase systems to determine the distribution (spatial partitioning) of additives within polymer blends. ToF-SIMS is equally capable of simultaneously providing quantitative trace metal element, monomer (ENB content, C2/C3 ratio) and oxidation analysis from microscopic polymer domains, such as full compositional analysis of EPDM gels [828]. 

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