Arsine-entrained air flame

Fiorino et al. [13] described the use of a shielded hydrogen (nitrogen diluted) entrained air flame for the analysis of food and animal tissue for arsenic. 

Dry tissue (1—3 g) is digested with 30 ml of nitric acid, sulphuric and perchloric acids (4 4 1). After heating for approximately 1.5h, the cooled solution is transferred to a 100 ml flask, 30 ml hydrochloric acid added and diluted to 100 ml with water. Suitable aliquots, up to 20 ml, of this solution are used for the subsequent arsenic analysis. 

5 ml sodium iodide (10%w/v) is added as a pre-reductant, and the arsine is generated by the addition of 6—8 ml alkaline sodium borohydride solution (4g in 100 ml sodium hydroxide, 10% w/v). The arsine gas is led to the burner and the transient absorption signal measured at 197.2 nm. 

---