The Removal of Interference from Microwave Digestion Solution of Industrial Wastewater on the Determination of Arsenic

In existing literature ,there is no unified time for the evaporating excessive acid to microwave digestion solution of different samples. a new method was developed .The interference from nitrite ion and volatile nitrogen oxides which were generated during digestion were quickly removed by the adding urea and heating with boiling water. The interference from nitrate was studied. Optimized conditions of determination of arsenic with hydride generation atomic absorption spectrometry. The detection limit was 0.3μg·L-1 and minimum quantitative detection limit was 1.0μg·L-1, the relative standard deviation of standard addition method in sample was 1.1% and recovery from 98 % to 102%.