View More View Less
  • 1 Departamento de Quimíca Física Aplicada Madrid Spain
  • | 2 Instituto de Recursos Naturales y Agrobiología Tenerife Spain
  • | 3 Universidad Autónoma Departamento de Química Agrícola Geología y Geoquímica, Facultad de Ciencias Cantoblanco 28049 Madrid Spain
Restricted access


A technique for quantitative analysis of different soils, ceramics, feldspars and natural halide samples is presented, based on the measurement of -activities using a Geiger-Müller system. The system was calibrated with KCl, KC8H5O4, KNO3 and K2SO4 standards and a potassium content of 1% yields a net -count rate (background subtracted) of about 55 cph. Precision values of less than ±0.4% K can be achieved in counting times of about 4 hours. The results agree with those obtained by means of other more common analytical methods such as flame photometry, atomic absorption and -spectrometry. In comparison with these methods, this approach is direct, precise and non-destructive, because the samples do not require prior treatment.