Summary Calibration standards for quantitative X‐ray microanalysis of resin‐embedded plant tissue were prepared by adding 6600 mM KC1 to 5% agar. Agar blocks with an edge length of 1–2 mm were rapidly frozen, freeze‐dried and embedded in styrene‐methacrylate. Dry sections 1 μm thick were mounted on adhesive‐coated grids. Apart from fine‐scale inhomogeneities caused by ice crystal formation, the KC1 is evenly distributed in the agar blocks. The peak‐to‐continuum values of K and Cl were highly linearly correlated to the K and Cl contents over the whole concentration range.
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Fritz et al. (1994) studied this question.
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