首页> 外文期刊>Analytical chemistry >DETERMINATION OF ATMOSPHERIC METHYL BROMIDE BY CRYOTRAPPING GAS CHROMATOGRAPHY AND APPLICATION TO SOIL KINETIC STUDIES USING A DYNAMIC DILUTION SYSTEM
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DETERMINATION OF ATMOSPHERIC METHYL BROMIDE BY CRYOTRAPPING GAS CHROMATOGRAPHY AND APPLICATION TO SOIL KINETIC STUDIES USING A DYNAMIC DILUTION SYSTEM

机译:气相色谱-气相色谱法测定大气中的甲基溴及其在动力稀释中的应用

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摘要

Methyl bromide (CH3Br) is considered to be a major source of stratospheric Br, which contributes to the destruction of ozone. It is therefore necessary to understand the natural sinks of this compound and to accurately measure ambient mixing ratios, Methodology is described for the measurement of atmospheric CH3Br by cryotrapping-gas chromatography and its application to soil kinetics. A 2-propanol/dry ice cryotrap was used to preconcentrate CH3Br in standard and air samples, with subsequent detection using a gas chromatograph equipped with an O-2-doped electron capture detector (GC-ECD). The GC-ECD cryotrapping method had a detection limit of 0.23 pmol of CH3Br. This is equivalent to the amount of CH3Br in a 500 mL sample of ambient air at the estimated northern hemisphere atmospheric mixing ratio of 11 parts per trillion by volume (pptv), A dynamic dilution system was developed to produce mixing ratios of CH3Br ranging between 4 and 1000 pptv. Calibrated mixing ratios of CH3Br produced with the dilution system were used to determine soil uptake kinetics employing a dynamic soil incubation method.
机译:甲基溴(CH3Br)被认为是平流层Br的主要来源,它有助于破坏臭氧。因此,有必要了解该化合物的天然沉淀物并准确测量环境混合比。该方法描述了通过低温气相色谱法测定大气中CH3Br的方法及其在土壤动力学中的应用。使用2-丙醇/干冰低温阱对标准样品和空气样品中的CH3Br进行预浓缩,随后使用配有O-2掺杂电子捕获检测器(GC-ECD)的气相色谱仪进行检测。 GC-ECD冷冻捕获法的CH3Br检测限为0.23 pmol。这相当于在估计北半球大气混合比为11万亿体积分数(pptv)的500 mL环境空气样本中的CH3Br量,开发了一种动态稀释系统以产生CH3Br的混合比为4和1000 pptv。用稀释系统产生的校准的CH3Br混合比例用于通过动态土壤培养方法确定土壤吸收动力学。

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