“…Many methods have been published for the determination of small amounts of arsenic in various materials. Most are based on the separation of the arsenic by arsine evolution [5,6,9, IB) or by distillation as arsenic trichloride (11) or pentabromide (1, 13). The final determination is usually made by modifications of the Gutzeit method-i.e., absorption of arsine or string, paper, or powder impregnated with silver or mercury salts (6, (1-5, 7, 8, 10, [14][15][16].…”