Preventing uranium hydride formation in standard uranium samples for determination of 239Pu by ICP-MS

被引：16

作者：

Vais, V ^{[1
]}

Li, CS ^{[1
]}

Cornett, J ^{[1
]}

机构：

[1] Hlth Canada, Radiat Protect Bur, Ottawa, ON K1A 1C1, Canada

来源：

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY | 2004年 / 19卷 / 09期

关键词：

D O I：

10.1039/b403143a

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

UH+ interference poses considerable difficulties for the determination of Pu-239 in samples with high uranium content. A new approach for reducing this interference was developed. Substitution of water with heavy water (D2O) as a solvent in uranium standard solution eliminated the major source of UH+ ions and reduced the UH+/U+ ratio from a typical value of 1.33x10(-5) to a very low value of 2.60x10(-7). The method allows the determination of low levels of Pu-239 in samples containing 10(6) fold excess of uranium. The detection limit for Pu-239 in a sample containing 10 ppm of uranium was determined as 0.58+/-0.03 ppt. A kinetic isotope effect of ca. 1.4 was observed for the reaction of U+ with hydrogen (H) compared with the reaction with deuterium (D). The magnitude of this effect is in agreement with the value calculated based on the collision theory.

引用

页码：1281 / 1283

页数：3

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