GC– Gas Chromotography
HPLC–High Pressure Liquid Chromatography
GC/MS–Gas Chromatography/Mass Spectroscopy
FID–Flame ionization Detector
ECD–Electron Capture Detector
TOC–Total Organic Carbon
Interepreting your Results
MCL–Maximum Contamination Limit: An enforceable standard set by the EPA to regulate contamintion. It is assumed that levels above the MCL are hazardous and cannot be thoroughly removed or flushed from a particular water system. A high concentration of contaminates above the MCL value can possibly lead to health problems.
MDL–Method Detection Limit: It is the lowest limit by which a compound can actually be detected and measured within our lab. Amounts less than the MDL value cannot be verifiably quantified. Therefore, values less than the MDL are reported as such. For example, a pesticide has a value of 0.07 ppm in drinking water, but the MDL value for the lab is 0.10 ppm. The reported value would be <0.10 ppm.
PPB–Parts Per Billion: It is the concentration of an analyte in the sample (if present). Commonly referred to on reports as ug/L.
PPM–Parts Per Million: It is the concentration of an analyte in the sample (if present). Commonly referred to on reports as mg/L for water and mg/kg for soil.
SOC–Synthetic Organic Compounds: In the SOC set you will see the following tests: EPA 504.1 EDB/DBCP, EPA 505 Chlorinated Pesticides/PCBs, EPA 515.4 Chlorinated Herbicides, EPA 525.2 Semivolatile Organic Compounds, EPA 531.2 Carbamates, EPA 547 Glyphosate, EPA 548.1 Endothall, and EPA 549.2 Diquat.
VOC–Volatile Organic Compounds:
TPH-Mod–Total Petroleum Hydrocarbons Modified: This includes tests for TPH-D (Diesel Range Organics), Tph-G (Gas Range Organics) and TPH-O (Oil). The TPH’s are extracted by either EPA methods 3510 (liquid) or 3550 (solid) and are analyzed by EPA method 8015-Mod.