A tantalum boat was used to study interference effects for the elements zinc, copper, manganese, iron, and sodium. The maximum absorption signal depended on the temperature of the boat and on bow long a particular temperature was applied. The parameters were different for each element. Calibration curves for zinc, copper, and manganese differed for the different anions with which they were associated. For anions studied (chloride, nitrate, and sulfate), chloride in each case produced the largest absorption signal for the metal atom. Absorption responses of zinc, copper, and manganese were studied in the presence of a series of added ions: Na<sup>+</sup>, Ca<sup>2+</sup>, Fe<sup>2+</sup>, Mg<sup>2+</sup>, Cu<sup>2+</sup>, SO<sub>4</sub><sup>2-</sup>, and PO<sub>4</sub><sup>3-</sup>. The effects of all except Ca<sup>2+</sup> and PO<sub>4</sub><sup>3-</sup> were negligible. Ca<sup>2+</sup> and PO<sub>4</sub><sup>3-</sup> caused the largest signal depression, although SO<sub>4</sub><sup>2-</sup> also caused some. As the temperature of the tantalum boat was increased, the interference effect decreased but did not vanish. The absorption signal of Na<sup>+</sup>, studied in the presence of Li<sup>+</sup>, Rb<sup>+</sup>, and Cs<sup>+</sup>, was enhanced slightly in each case, but the effect was less than that observed for the same systems when aspirating a liquid sample into a flame cell.
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