Specific features of the determination of arsenic in soils by electrothermal atomic absorption spectrometry with the injection of suspensions

Problems of the determination of arsenic in soils by electrothermal atomic absorption with the injection of suspensions are discussed. To eliminate an exceptionally high rate of nonselective absorption due to intense evaporation of the inorganic matrix of the sample, the author proposed the reduction of the temperature to arsenic atomization. The optimized temperatures of pyrolysis and atomization steps are 500 and 1800°C, respectively; therein no matrix modifiers were used. The proposed approach was tested on reference samples of soils.