顶空气相色谱法测定氢气纳米气泡水中的总氢含量

Measurement of total hydrogen content in hydrogen nanobubble water by headspace gas chromatography

氢气纳米气泡在环境修复、能源燃料和医疗健康等领域具有广泛的应用前景。目前氢气纳米气泡水中总氢含量的测定方法还相对有限,无法准确评定相关发生设备的性能。顶空气相色谱法通过加热使顶空瓶内体系达到气液平衡的方式将水样中的氢气转移到气相中,利用气相色谱仪来测定氢气纳米气泡水中的总氢含量。结果表明:样品的最佳平衡温度为50℃,平衡时间为15 min。通过对氢气纳米气泡水中氢气纳米气泡的数量浓度及粒径分布的检测,证实了该顶空气相色谱法适用于大多数纳米气泡产生方式所制备的氢气纳米气泡水体系,即氢气纳米气泡数量浓度范围为106~108个/mL,平均粒径范围为100~300 nm。当氢气纳米气泡数量浓度为6.7×10^(6)~3.8×10^(8)个/mL时,对应测得的氢含量为0~3.12 mg/L,氢气纳米气泡数量浓度与对应氢含量变化一致,且能在2 min内完成检测。该方法简单高效,可以满足不同数量浓度氢气纳米气泡水的测试要求,为测定氢气纳米气泡水中总氢含量提供了可行的选择,有助于进一步研究氢气纳米气泡在各领域的重要应用并进行发生设备的性能评价。

Hydrogen nanobubbles have shown great potential in various applications such as environmental remediation,energy fuel production,and medical applications.However,accurately determining the total hydrogen content in hydrogen nanobubble water has been a challenge,which affects the evaluation of nanobubble generator performance.To address this issue,a method using headspace gas chromatography was developed,which transferred hydrogen from the liquid phase to the gas phase by heating the headspace bottle to achieve gas-liquid equilibrium,and then determined the total hydrogen content in hydrogen nanobubble water using gas chromatography.The results show that the optimal equilibrium condition for sample pretreatment is 50℃for 15 min.It has been confirmed that the headspace gas chromatography method is suitable for analyzing a wide range of hydrogen nanobubble water systems(with number concentrations ranging from 106 to 108 mL^(−1)and average particle sizes ranging from 100 to 300 nm)prepared by most nanobubble generation methods,by detecting both number concentration and particle size distribution of hydrogen nanobubbles in hydrogen nanobubble water.When the number concentrations of hydrogen nanobubbles are within the range of 6.7×10^(6)-3.8×10^(8)mL−1,the corresponding measured hydrogen contents fall between 0-3.12 mg/L.The changes in number concentrations of hydrogen nanobubbles are consistent with the corresponding hydrogen contents,and the detection process can be completed within 2 minutes.This method is simple and efficient,and can fulfill the test requirements regarding different number concentrations of hydrogen nanobubble water,providing a feasible option for quantifying the total hydrogen content in hydrogen nanobubble water.It facilitates further research on their significant applications of hydrogen nanobubbles in various fields and enables the evaluation of nanobubble generator performance.