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首页> 外文期刊>Environmental Science & Technology >Measurement of dissolved H-2, O-2, and CO2 in groundwater using passive samplers for gas chromatographic analyses
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Measurement of dissolved H-2, O-2, and CO2 in groundwater using passive samplers for gas chromatographic analyses

机译：使用无源采样器进行气相色谱分析，测量地下水中溶解的H-2，O-2和CO2

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摘要

A simple in-situ passive dissolved gas groundwater sampler, comprised of a short length of silicone tubing attached to a gastight or other syringe, was adapted and tested for in-situ collection of equilibrium gas samples. Sampler retrieval after several days of immersion in groundwater allowed the direct injection of the sample onto a gas chromatograph (GC), simplifying field collection and sample handling over the commonly used "bubble stripping" method for H-2 analyses. A GC was modified by sequencing a thermal conductivity (TC) detector followed by a reductive gas (RG) detector so that linear calibration of H-2 over the range 0.2-200 000 ppmv was attained using a 0.5-mL gas sample; inclusion of the TC detector allowed the simultaneous quantification of other fixed gases (O-2, CO2, He, and Ne) to which the RG detector was not responsive. Uptake kinetics for H-2 and He indicated that the passive sampler reached equilibrium within 12 h of immersion in water. Field testing of these passive samplers revealed unusually large equilibrium gas-phase H-2 concentrations in groundwater, ranging from 0.1 to 13.9%, by volume, in 11 monitoring wells surrounding four former radiological wastewater disposal ponds at the Y-12 plant in Oak Ridge, Tennessee.
机译：对一个简单的原位被动溶解气体地下水采样器进行了改造，并对其进行了测试，该采样器由连接至气密或其他注射器的短长度的硅胶管组成，并进行了原位采集。将样品浸入地下水中数天后取回样品，从而可以将样品直接注入气相色谱仪（GC）中，从而简化了现场收集和样品处理，而这是用于H-2分析的常用“气泡汽提”方法。通过对热导率（TC）检测器和还原性气体（RG）检测器进行排序来对GC进行修改，以便使用0.5 mL气体样品对H-2进行0.2-200 000 ppmv范围内的线性校准。包含TC检测器可以同时定量RG检测器不响应的其他固定气体（O-2，CO2，He和Ne）。 H-2和He的吸收动力学表明，被动采样器在浸入水中12小时内达到平衡。这些无源采样器的现场测试显示，橡树岭Y-12工厂周围四个以前的放射性废水处理池周围的11口监测井中，地下水中H-2平衡气态H2的浓度异常高，按体积计为0.1％至13.9％。 ，田纳西州。

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