评估在单盲控制测试协议下持续监控解决方案性能进展情况
Chiemezie Ilonze1, Ethan Emerson2, Aidan Duggan2
1Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States.
Environmental science & technology
|June 12, 2024
概括
对甲排放的持续监测 (CM) 解决方案显示性能有所改善. 四个解决方案达到检测极限,假阳性率低,尽管量化不确定性仍然很大.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 甲排放监测 甲排放监测
背景情况:
- 越来越多的监管重点是对甲 (CH4) 排放的持续监测 (CM).
- 需要标准化,严格的测试协议来描述CM解决方案的性能.
- 在CM技术的快速进步需要性能验证.
研究的目的:
- 评估在受控条件下对甲 (CH4) 排放的九种连续监测 (CM) 解决方案的性能.
- 评估检测极限,假阳性率和CM溶液的量化准确性.
- 将当前的CM解决方案性能与以前的研究进行比较,并确定需要改进的领域.
主要方法:
- 在11周内对9种CM溶液进行单盲控制测试.
- 在不同风速 (0.7-9.9米/秒) 下,甲 (CH4) 的控制释放速度在每小时6至7100克之间.
- 对方法检测极限 (DL90s),假阳性率和量化准确度的分析.
主要成果:
- 四种CM解决方案在测试范围 (3.9-6.2公斤CH4/h) 内达到方法检测极限,假阳性率低 (6.9-13.2%).
- 观察到显著的量化不确定性,低估/高估因子超过14和42.
- 三种解决方案在量化因子为3的范围内显示了>80%的准确性,释放量>0.1公斤CH4/h.
结论:
- 与以前的评估相比,当前的CM解决方案显示了与以前的评估相比的一般性能改进,特别是重新测试的解决方案.
- 定期的质量测试对于推进CM技术以有效减轻甲排放至关重要.
- 接近理想的上游现场条件可能代表CM解决方案的最佳性能场景.
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