Stationary Source Emissions2023-11-29T22:55:52-05:00

Stationary Source Testing


NELAP accredited for a full range of EPA and stationary source testing with in-lab and on-site analytical support services. Enthalpy provides analytical support for over 1,600 stack tests annually. We provide robust solutions for unique and challenging test programs by addressing laboratory, stack tester and source challenges.

Experience is what matters when dealing with the varied and challenging gas-matrices of stationary sources. With over 25 years of experience source emissions 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.

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 0.00001 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

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

At Enthalpy, our HPLC and Trace Metals teams are dedicated specialists when it comes to EPA inorganic methods. With impressive method detection limits below the industry average, we take pride in our contribution to regulatory compliance tests across the nation. Our skilled experts have been instrumental in refining key methods, working closely with the EPA to drive ongoing improvements. Trust us to deliver professional and reliable results every time.
Enthalpy is the premier choice for your inorganic testing needs, boasting cutting-edge laboratory instrumentation designed for most US EPA methods, along with our talented team of analysts who can bring HPLCs to the field for real-time measurements. Trust Enthalpy for unparalleled precision and reliability in your next inorganic test program.
EPA Methods:
6, 8, 12, 26, 26A, 29, 306, 3050, 3052, 6010, 6020, 7470, 7471, CTM-013, CTM-13A, CTM-027, CTM-031, CTM-036, IO-3.1, IO-3.5, OTM-14, OTM-29, 101 A
NIOSH Methods:
6009 and 7303

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 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, D5504

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.

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 set up, 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

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)
  • Quantum Cascade Laser-Based MEMs Photoacoustic Analyzers
  • Pulse Q-Switched Tunable Diode Laser Spectrometers

View Our Recent Blog Post

Breaking Down California’s Multi-Agency Update to Vapor Intrusion Guidance

In February 2023, an update to the 2011 DTSC Soil Vapor Intrusion guidance was released with input from DTSC, CalEPA, and Regional and State Water Quality Control Boards. This comprehensive, long-awaited, revised guidance provides updates on vapor intrusion concepts and practices and will expand their application from regional to statewide in California.

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