A comparison between one non-invasive and three invasive procedures used in the preparation of plant material for X-Ray microanalysis
It is generally accepted that accurate quantitative elemental x-ray microanalysis of bio-organic material depends critically on the way the sample is treated before it is analysed. It is axiomatic that preparative procedures which change the local permeability of samples are going to be less useful than procedures which do not affect this critical property of cells and tissues, particularly if highly diffusible electolytes are the focus of any investigation. Thus we generally eschew ambient temperature methods in favour of low temperature techniques which either slow down or halt diffusion processes. As part of a larger study on the distribution and local concentration of aluminium in the developing leaves of tea plants, which under some circumstances can be as high 30,000ppm, a comparative study has been carried out to assess the effectiveness of four preparative techniques in retaining this element in the cell walls and vacuoles of older tea leaves which are know to contain more aluminium than younger leaves.