Stationary Source Emissions

Stationary Source Emissions

Experience is what matters when dealing with the varied and challenging gas-matrices of stationary sources. With over 25 years of experience source testing and on-site analytical capabilities, our scientists and project managers are able to provide robust analytical solutions for the most challenging projects. Enthalpy provides analytical and consulting support for over 1,600 stack tests annually.

Our company routinely assists the state and federal regulatory bodies in the refinement of existing test methods and development of new test methods. Enthalpy’s experience with method development includes: EPA Other Test Method 29 (OTM-29) Sampling and Analysis for Hydrogen Cyanide Emissions from Stationary Sources and EPA Alternative Test Method 100 (ALT-100) Canister Sampling with Method 18 for Flares.

Unique and challenging test programs are jointly addressed with the laboratory, stack tester, and end-user in order to develop source and analyte-specific sampling and analytical procedures that will hold up to regulatory scrutiny.


EPA Test Methods – Particulate

Enthalpy has decades of experience with EPA particulate methods and performs more than 10,000 unique gravimetric measurements annually. From PM2.5 to non-sulfate particulate matter and everything in between, our researchers utilize evaporation chambers and desiccators during testing, and they have with the ability to obtain gravimetric weights as low as 0.00000 grams on a 6-place balance.

We can provide uniquely labeled and packaged tare-weighed filters with just a single-business day notice for all methods. Each of our gravimetric balances are calibrated daily with the use of NIST traceable challenge weights to ensure quality and consistency across all projects. We have a broad understanding of today’s modern regulatory environment and the challenges of low level particulate measurements. – any lab that claims these methods are simple, doesn’t know how much they don’t know.

EPA Methods:

5, 5A, 5B, 5E, 5F, 17, 24, 201A, 202, 315


EPA Test Methods – Organics

Enthalpy is the industry leader for analyzing samples using EPA volatile organic compound (VOC) test methods. We have been at the forefront of providing analytical solutions for challenging test-programs from our flagship service of EPA Method 18 design and analysis.

VOC testing is complicated – concentration, temperature, moisture, and pressure all affect how VOCs behave in a stack. These four pieces of information are critical to media selection, whether Tedlar bags, adsorbent tubes, direct interface, or Summa canisters.

Enthalpy has trained analysts who understand equipment operation in lab and in the field. Equipped with the latest Gas Chromatographs (GC) and FTIR spectrometers, there are very few VOCs for which we cannot test. Allow us to guide you to the best testing scenario for your situation and utilize experience gained from thousands of in-lab and on-site direct interface jobs.

EPA Methods:

15, 16, 18, 25D, 106, 204F, 305, 308, 311, 316, 318, 320, 323, CTM-008, OTM-11, ALT-100


EPA Test Methods – Inorganics

Our High-Pressure Liquid Chromatography (HPLC) group specializes in EPA inorganic methods. Enthalpy boasts method detection limits lower than the industry average and has been a part of regulatory compliance tests nationwide. Our experts have assisted the EPA with the refinement of certain methods and pushes for their continual improvement.

With state-of-the-art HPLC instruments outfitted with a variety of detectors, the ability of our analysts to take HPLCs into the field for same-day measurements, and an exemplary greater than 90% Stationary Source Audit Program (SSAP) pass rate, Enthalpy is the best choice for your next inorganic test program.

EPA Methods:

6, 8, 26, 26A, CTM-013, CTM-13A, CTM-027, CTM-031, CTM-036, OTM-14, OTM-29


EPA Other Test Methods

Our modern laboratories are generously equipped to handle a wide range of air test methods, including state specific, OSHA, NIOSH, or custom methods. While many labs focus on more commonly requested methods, we take a more holistic approach to air testing. If your test program requires an unusual or custom method, nobody is more qualified to assist you.

EPA Methods:

ALCOA 1470/1471, BAAQMD ST-1B, BAAQMD 45, CARB 421, CARB 421, NIOSH 7903, NIOSH 7904, NJATM 1, Radiello 130 Solvent Analysis


ASTM Test Methods

ASTM International has been developing and writing air test methods for more than 40 years. With exacting standards, rigorous QA/QC measures, and regular updates, these methods have been widely accepted tools for air compliance programs. While ASTM is not a regulatory body, its methods are recognized internationally and often used to demonstrate compliance. With a global footprint, using ASTM methods allows for method transfer and harmonization across facilities.

ASTM Methods:

D1945, D1946, D3792, D6348, D6735


NCASI Test Methods

The National Council of Air and Stream Improvement (NCASI) has maintained itself as an independent non-profit research organization founded by the wood products industry in 1943. In the absence of adequate air and water test methods relevant to the analytes and source types found at wood products facilities, NCASI began developing and publishing air and water test methods in the 1990s.

Our people have been proactive in understanding, executing, and adding these methods to our NELAP scope of accreditations as they become available. We have developed a thorough understanding of the in-lab and in-field performance measures for each method in order to help validate a test program.

NCASI Methods primarily focus on the sampling and analysis of alcohols (methanol, phenol) and aldehydes (formaldehyde, acetaldehyde, acrolein, propionaldehyde). The suitability of NCASI test methods goes beyond wood products facilities, and they are often used for engineering as well as compliance testing.


On-Site Test Methods

Reliable, fast and versatile – those are just three advantages to the on-site testing services of Enthalpy. As facilities demand immediate results for complex and highly scrutinized test programs, the ability to perform on-site testing from an accredited mobile lab is a powerful tool. Our field services include Fourier transform infrared (FTIR) spectroscopy, gas chromatography (GC), high pressure liquid chromatography (HPLC) and spectrophotometry (SPEC).

Enthalpy mobilizes highly trained laboratory analysts to perform on-site testing throughout the United States and internationally. Our analysts have the ability to setup, calibrate, troubleshoot and repair equipment in the field as necessary. While we cannot foresee problems that may arise in the field, we can mobilize equipment and staff capable of addressing these problems head on. We provide experienced personnel who ensure a successful project the first time.

FTIR Methods:

  • EPA Methods 318, 320, 321
  • ASTM Method 6348
  • NIOSH Method 3800

GC Methods:

  • EPA Methods 15, 16, 18
  • NCASI Methods 94.03, 98.01

HPLC Methods:

  • EPA Methods 26, 26A, CTM-013, CTM-027
  • NCASI Method 8A

Spectrophotometric Methods:

  • EPA Methods 316, 323
  • NCASI Methods 94.03, 98.01


Emerging Technology

State-of-the-art technology that allows us to enhance our emissions testing services including providing clients with real-time, low level VOC, and inorganic monitoring in stationary and ambient sources through the use of mobile platforms. We have instruments that can detect the lowest traces of organic vapors for our clients.

  • Proton Transfer Time of Flight Mass Spectrometry (PTR-TOS-MS)
  • Ultra-Violet Differential Optical Absorbance (UV-DOAS)
  • Open-Path FTIR Techniques
  • Video Imaging Spectro-Radiometry (VISR)
  • Quantim Cascade Laser-Based MEMs Photoacoustic Analyzers
  • Pulse Q-Switched Tunable Diode Laser Spectrometers


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