EFFECT OF ASCORBIC-ACID ON GRAPHITE-FURNACE ATOMIC-ABSORPTION SIGNALS FOR LEAD

被引：27

作者：

IMAI, S

HAYASHI, Y

机构：

[1] Department of Chemistry, Joetsu University of Education, Joetsu

来源：

ANALYTICAL CHEMISTRY | 1991年 / 63卷 / 08期

关键词：

D O I：

10.1021/ac00008a007

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Double-peak atomic absorption signals for lead were observed in the presence of 1% (m/v) (mass/volume) ascorbic acid when the nonpyrolytic coated graphite (NPG) tube was used. The signal with double peaks could be separated into two signals: The position of the first peak was in agreement with the position of the signal in the absence of ascorbic acid using the pyrolytic graphite (PG) tube, and the position of the second peak was in agreement with the position of the signal in the absence of ascorbic acid using the NPG tube. A less porous and smooth surface was found by using scanning electron microscopy on the NPG tube wall after pyrolyzing ascorbic acid. It was considered that pyrolyzing ascorbic acid produced PG-coated sites on the NPG tube that lead to the appearance of the first peak.

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页码：772 / 775

页数：4

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