Applying a new method for direct collection, volume quantification and determination of N2 emission from water.
Applying a new method for direct collection, volume quantification and determination of N2 emission from water.
复制标题
DOI：
10.1016/j.jes.2014.04.012
复制
发表时间：
2015
影响因子：
6.9
通讯作者：
Xinhong Liu;Yan Gao;Hongliang Wang;Junyao Guo;S. Yan
中科院分区：
文献类型：
--
作者：
Xinhong Liu;Yan Gao;Hongliang Wang;Junyao Guo;S. Yan
氮气的排放对于从湖泊、池塘和湿地中去除多余的氮是很重要的。为了研究水中的气体排放，高等人。(2013)开发了一种使用气泡捕集器从水中收集气体样本的新方法。然而，采样量和气体成分浓度的测定精度仍有争议。在这项研究中，该方法在现场采样、准确的体积测量和直接进样到气相色谱仪分析氮气和其他气体方面进行了优化。在优化的新方法中，N_2的平均回收率为100.28%，平均测定系数(R2)为0.9997，检出限为0.02%。在15℃恒温条件下，用平均相对峰面积(%)与0天的平均相对峰面积比较，进一步评价了瓶装水、真空袋和真空瓶三种新方法对样品在15℃恒温下保存1、2、3、5和7天后的N2浓度变化的影响。装水瓶法的各项指标最低(99.5%~108.5%)，而真空袋法和真空小瓶法的各项指标(119%~217%)较低。同时，对其他气体成分(O2、CH4和N2O)的气相色谱测定也是准确的。这种新的方法是研究各种水生生态系统释放的N2的另一种方法。
The emission of N2is important to remove excess N from lakes, ponds, and wetlands. To investigate the gas emission from water, Gao et al. (2013) developed a new method using a bubble trap device to collect gas samples from waters. However, the determination accuracy of sampling volume and gas component concentration was still debatable. In this study, the method was optimized forin situsampling, accurate volume measurement and direct injection to a gas chromatograph for the analysis of N2and other gases. By the optimized new method, the recovery rate for N2was 100.28% on average; the mean coefficient of determination (R2) was 0.9997; the limit of detection was 0.02%. We further assessed the effects of the new method, bottle full of water,vs.vacuum bag and vacuum vial methods, on variations of N2concentration as influenced by sample storage times of 1, 2, 3, 5, and 7 days at constant temperature of 15°C, using indices of averaged relative peak area (%) in comparison with the averaged relative peak area of each method at 0 day. The indices of the bottle full of water method were the lowest (99.5%–108.5%) compared to the indices of vacuum bag and vacuum vial methods (119%–217%). Meanwhile, the gas chromatograph determination of other gas components (O2, CH4, and N2O) was also accurate. The new method was an alternative way to investigate N2released from various kinds of aquatic ecosystems.