用湿法氧化预处理进行水中14C分析研究

摘要/Abstract

摘要： 介绍了一种基于湿法氧化预处理环境水中¹⁴C的分析方法。设计了一套湿法氧化装置,样品处理量为20 L,可对水中无机碳和有机碳分别进行转化和吸收。经转化和吸收后的样品在二氧化碳释放吸收装置上与闪烁液混合,最后在低本底液闪谱仪上进行测量。分析了有机碳和无机碳回收率的稳定性和准确性,给出了典型样品最小可探测活度浓度和测量值。采用本方法可高效、稳定提取环境水体中的有机碳和无机碳,回收率分别为96.8%和97.8%,典型环境条件下对¹⁴C的最小可探测活度浓度可达到0.015 Bq·(gC)^-1。

关键词: ¹⁴C, 有机碳, 无机碳, 湿法氧化, 探测限

Abstract: In this paper, an analytical method of ¹⁴C in environment water based on wet oxidation was presented. With the method the inorganic and organic carbon within about 20 L environmental water could be converted into CO₂, and then absorbed for measurement on a low level liquid scintillation counter (LSC). The methodology accuracy, the precision and the minimum detection concentration (MDC) were analyzed and presented. It is shown that the inorganic and organic carbon in environmental water could be extracted efficiently and stably, with the recoveries of 97.8% and 96.8% respectively. The method can be used reliably for the analysis of ¹⁴C in environmental water.

Key words: ¹⁴C, organic carbon, inorganic carbon, wet-oxidation, minimum detection concentration

中图分类号:

TL99

郭贵银, 黄彦君, 张兵, 张海英, 曾帆, 陈超峰, 钦红娟. 用湿法氧化预处理进行水中¹⁴C分析研究[J]. 辐射防护, 2015, 35(6): 339-344.

Guo Guiyin, Huang Yanjun, Zhang Bing, Zhang Haiying, Zeng Fan, Chen Chaofen, Qin Hongjuan. Analysis of ¹⁴C in environmental water based on wet-oxidation pretreatment[J]. RADIATION PROTECTION, 2015, 35(6): 339-344.

参考文献

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用湿法氧化预处理进行水中¹⁴C分析研究

Analysis of ¹⁴C in environmental water based on wet-oxidation pretreatment

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