评估空气质量至关重要，为监管机构提供空气污染数据，并评估污染控制策略的有效性。元素提供了一系列收集和分析方法，以涵盖所有的air qualityanalytical needs.

Polluted air can be a danger to the population, leading to serious health risks and degradation of the environment. Element utilizes methods that determine the concentrations of various pollutants in air samples to ensure that the air is safe for humans and the environment.

The Element US laboratories are NELAC/TNI and ISO 17025 accredited, holding certification in LA and TX, and offer air quality monitoring services to EPA Method TO-15, and EPA Method 18.

The Element EU laboratories are ISO 17025 accredited for the EPA Method TO15.

有关我们的空气质量监控服务的更多信息，请contact us today.

EPA Method TO-15

Element offers sampling and analysis of ambient air to determine subsets of the 97 volatile organic compounds (VOCs) included in the 189 hazardous air pollutants (HAPs) listed in Title III of the Clean Air Act Amendments of 1990. Our analysis services can achieve reporting limits around one ppbv for all target compounds depending on the volume of air in the sample canister.

Samples should be collected in specially prepared canisters evacuated to approximately ~30 inches of Mercury. Samples may be collected as a grab sample or as a time-integrated sample by using a flow control device. TO-15 samples can be held for up to 30 days from collection to analysis.

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EPA Method 18

Using EPA Method 18, Element can measure the total mass emissions of VOCs and determine compliance with the emission concentration limit. Method 18 allows for four different sampling options: Direct interface, dilution interface, adsorption tube, and Tedlar bag sampling. Element commonly uses Tedlar bag sampling for analysis conducted in the laboratory.

Element conducts Method 18 analysis via Gas Chromatography with Flame Ionization Detector (GC-FID) for samples collected in Tedlar bags. Element also conducts matrix spike recovery for each source to ensure the overall accuracy of measurements in the analytical procedure.

Samples should be collected in three or more Tedlar bags. Extra bags provide backup in case of leaks. SUMMA canisters are not allowed under Method 18. There is no technical holding time for Method 18 as long as the recovery study criteria are met.

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Landfill Bulk Gases

Element uses the GC-FID method to test landfill bulk gases for the concentrations of methane, carbon dioxide, oxygen, nitrogen, and carbon monoxide.

Samples can be collected in Tedlar Bags or SILOCANS over a range of 5 minutes to 24 hours, allowing for an analysis of changing concentrations in air over a period of time. For samples collected in Tedlar bags, we recommend that analysis be completed within 48 hours of sampling because Tedlar bags are more prone to leaks and breakage than canisters.

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