無機酸在原子吸光法測定金屬時之干擾探討

A Study of Acid Interferences in Atomic Absorption Detections of Metals

吳家誠(Gaston J. Wu) ； 蔡運洪(Y. H. Tsai)

《化學》 48卷2期 (1990/06) Pp. 109-112

https://doi.org/10.6623/chem.1990015

摘要

硫酸、硝酸及鹽酸等無機酸於重金屬分析時常被使用爲消化劑；或將金屬由濃縮系統中沖湜出來之流洗劑。本研究探討三種常用無機酸在以火焰原子吸光法測定七種重金屬時，所產生的干擾。干擾之程度隨著酸的種類及濃度而不同。因黏滯度之關係，硫酸有最大的干擾現象，而硝酸最小。產生干擾之原因與火焰原子吸光法之原子化過程有關，因氣態金屬離子化合物之分解反應及與金屬離子對應之陰離子分解過程的可逆性，依無機酸種類之不同而異，必需賴對火焰原子化過程來加以探究與解釋。

並列摘要

Inorganic acids, such as sulfuric acid, nitric acid and hydrochloric acid, are frequently used as digesting agents or eluents for recovering metals from concentration units. The interferences of these acids for determinations of seven metals by flame AA are evaluated, The degree of interference depends on acid type and its concentration. Among the three acids studied, sulfuric acid shows the highest degree of interference and nitric acid has the least. The extent of interference is complicated by flame AA atomization processes and can be explained only by thorough understanding of flame chemistry.