大气中颗粒态总汞的测定
Determination of Total Particulate Mercury in the Atmosphered
查看参考文献9篇
|
文摘
|
汞在大气中的化学行为对全球的生物地球化学循环起着极其重要的控制作用.大气汞主要包括气态单质汞(Hg0)、气态活性汞(Hg2+)和颗粒态汞.尽管颗粒态总汞(TPM)占大气总汞的5%以下,但它却是大气汞干湿沉降的主要贡献者之一,对于汞在大气中的循环演化意义重大.大气中TPM的含量在pg·m-3量级上,因此建立TPM的可靠采集与分析方法非常必要.本文利用一种新开发的小型捕集管建立了测定大气中痕量TPM的方法.实验证明,采样流速为1.0～1.5 L/min时,平行样的精密度高,最低检出限为2 pg;样品经2次循环分析其热解吸效率在99%以上,分析方法非常简单和省时. |
|
其他语种文摘
|
The chemical behaviors of mercury in the atmosphere play a significant controlling role in global mercury biogeochemical cycles. The main three forms of atmospheric mercury are: Elemental gaseous mercury ( Hg': ) . reac?tive gaseous mercury ( Hg" ' ) and particulate mercury. Although total particulate mercury (TPM) only constitute less than 5% of the total mercury in the atmosphere, it is likely to govern a substantial part of the total deposition of mercury and is believed to play an important role in the atmospheric cycle of mercury. The concentrations of TPM in ambient air are in the order of picograms per cubic meter of air. so it is imperative to have reliable methods for sampling and analysis of TPM. A procedure to determine trace TPM in the atmosphere using a new miniaturized trap was set up. The precision of the parallels was generally high, when air was pulled through the trap at rates ranging from 1.0 to 1. 5 L ? min ' during sampling. The absolute detection limit of the method is below 2 pg. The thermal desorption efficiency of samples is more than 99% through two analysis healing-cycles. The operational procedures of the method are easy and time-saving. |
|
来源
|
矿物岩石地球化学通报
,2005,24(4):333-336 【扩展库】
|
|
关键词
|
大气
;
颗粒态总汞
;
捕集管
;
测定
|
|
地址
|
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1007-2802 |
|
学科
|
环境科学基础理论 |
|
基金
|
国家自然科学基金资助项目
|
|
文献收藏号
|
CSCD:2154997
|
参考文献 共
9
共1页
|
|
1.
Lu J Y. A review[J].
Water, Air, and Soil Pollution,1999,112:279-295
|
CSCD被引
8
次
|
|
|
|
|
2.
Lu J Y. Comparison of conventional filtration and a denuder-based methodology for sampling of particulate-phase mercury in ambient air[J].
Talanta,1999,49:15-24
|
CSCD被引
5
次
|
|
|
|
|
3.
Lu J Y. A device for sampling and determination of total particulate mercury in ambient air[J].
Analytical Chemistry,1998,70:2403-2408
|
CSCD被引
10
次
|
|
|
|
|
4.
陈乐恬. 扩散管在大气汞分析中的应用[J].
环境科学与技术,2001,93(1):36-38,15
|
CSCD被引
1
次
|
|
|
|
|
5.
段秀琴. 兰州城区大气颗粒态汞的污染状况[J].
环境监测管理与技术,1995,7(3):19-20
|
CSCD被引
8
次
|
|
|
|
|
6.
Fang F. Atmospheric particulate mercury in Changchun City.
Atmospheric Environment,2001,35:4265-4272
|
CSCD被引
2
次
|
|
|
|
|
7.
王文华. 汞在北京大气中细颗粒物上的分布.
上海交通大学学报,2002,36(1):134-137
|
CSCD被引
11
次
|
|
|
|
|
8.
修光利. 大气微小颗粒粒物中汞的污染特性初步研究.
上海环境科学,2003,22(5):310-312,316
|
CSCD被引
5
次
|
|
|
|
|
9.
Keeler G J. Its significance on transport.
Water, Air and Soil Pollution,1995,80:159-168
|
CSCD被引
17
次
|
|
|
|
|
了解气象卫星更多信息，请访问