Determination of ammonium acetate extractable molybdenum in soil, and aqua regia(hydrochloric acid and nitric acid, 3+1) soluble molybdenum in soil and sewage sludge by electrothermal atomic absorption spectrometry

Abstract

Methods were developed for the direct electrothermal atomic absorption spectrometric determination of ammonium acetate extractable molybdenum in soil, and aqua regia(hydrochloric acid + nitric acid, 3+1) soluble molybdenum in soil and sewage sludge. An atomization temperature of 2900 °C provided maximum sensitivity without reducing the lifetime of the furnace. Multiple injections with an individual drying and ashing stage were used to provide the sensitivity required for the extractable determinations. Satisfactory accuracy was obtained and characteristic mass, precision and detection limits were determined. Molybdenum values are reported for a range of Community Bureau of Reference [(BCR), Belgium] Certified Reference Materials.