Observations on the distribution and determination of fluorine compounds in biological materials, including soils

The distribution of fluorine compounds found in biological materials, including soils, is outlined. Several improvements are proposed for the sampling and ashing of animal and plant tissues, and soil, including the use of finely ground suspensions in dilute agar solution. Some modifications are suggested in the separation of fluorine by diffusion as hydrofluoric acid and its subsequent determination with alizarin complexan. The effect of silica in the analysis of plants and soils for fluorine is discussed.