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石墨炉原子吸收法直接测定油中铅的主要困难在于:(1)铅是易挥发的元素,灰化温度超过600℃就会有损失,(2)油中存在大量有机机体造成严重的背景干扰。应用溶剂萃取湿法消解或干法灰化等预处理手段可减少基体干扰,但操作繁琐,过程冗长,又容易损失和玷污。我们用磷酸氢二铵作基体改进剂,使灰化温度提高到900℃,油中铅没有损失,而大量有机机体却在这样高的温度下除去,残余的背景吸收用氘灯校正。使用石墨平台技术,有效地消除了基体干扰。建立了不经化
The main difficulties of direct determination of lead in graphite by graphite furnace atomic absorption are: (1) lead is a volatile element, loss occurs when the ashing temperature exceeds 600 ° C, (2) there is a large amount of organic matter in the oil causing serious background interference . Application of solvent extraction wet digestion or dry ashing and other pretreatment means can reduce the matrix interference, but the operation is cumbersome, the process lengthy, but also easy to lose and tarnished. We use diammonium phosphate as a matrix modifier to raise the ashing temperature to 900 ° C without any loss of lead in the oil while a large number of organic bodies are removed at such high temperatures and the residual background absorbance is corrected with a deuterium lamp. The use of graphite platform technology, effectively eliminating the matrix interference. Established without the chemical