Chromatography and Wet Methods


Chromatography depends on selective retardation and separation of substances by a stationary bed of porous sorptive media as they are transported through the bed by a moving fluid. The degree of retardation, and hence the rate of migration, of each substance is determined by its relative affinity for the sorbent.

Gas Chromatography

Almost any organic or inorganic compound that can be vaporized can be separated and analyzed via gas chromatography. A gas chromatograph can be customized in order to allow detection of almost any type of compound (at almost any concentration).

Clean Air Engineering's organic laboratory specializes in the analysis of samples collected from source and ambient test programs. Clean Air requires that all analysis be pre-approved before sending samples to verify that the analysis objectives can be achieved.

Liquid Chromatography

Liquid chromatography is very useful for:

    • Scrubber Stoichiometry using both anion and cation scans;
    • Determining halogens emissions using EPA Method 26;
    • Determining ammonia concentration using EPA Conditional Test Method 027; and
    • Fluorides emissions using EPA Method 26A.

Common anions that can be analyzed using liquid chromatography include:

    • Fluoride;
    • Chloride;
    • Nitrite;
    • Bromide;
    • Nitrate;
    • Phosphate; and
    • Sulfate.

Concentrations of the above anions are determined in strict accordance with U.S. EPA Sampling Methods (e.g. Method 26 and Method 26A). The analysis also follows the methodology in U.S. EPA Method 300.1.

Common cations that can be analyzed using liquid chromatography include:

    • Lithium;
    • Sodium;
    • Ammonium;
    • Potassium;
    • Magnesium; and
    • Calcium.

CleanAir follows the procedures in U.S. EPA Method 300.1, adapting them for cation analysis.

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