This glossary serves as a quick look-up of the meaning of certain terms, including acronyms and symbols. When available, links will be provided to relevant topics for further reading.
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- the chemical symbol of the element calcium.
- an element or compound that has a positive charge (e.g., , )
- carrier recovery (%) used in radionuclide reporting
- the chemical symbol of the element cadmium.
- the chemical symbol of the chloride ion, the anion of the element chlorine (Cl).
- the chemical symbol of the element chromium.
- The Environmental Protection Agency's Clean Water Act, enacted in 1972 from the amended Federal Water Pollution Control Act of 1948. Summary of the Clean Water Act.
- detected but not quantifiable – used to denoted analytes with a signal above the method detection limit (MDL) but below the limit of quantitation (LOQ)
- EPA (aka US EPA)
- Environmental Protection Agency (EPA Website)
- the chemical symbol of a proton, the cation of the element hydrogen (H). Frequently used to designate the presence of acid in water.
- the chemical symbol of the polyatomic cation hydronium, the acidic version of a water molecule (H2O), whose concentration defines the acidity of water measured by the pH scale.
- the chemical symbol of the element mercury.
- ion chromatography, a method used for separating charged species (anions or cations) in water. (see also Ion Chromatography)
- ion chromatograph, an instrument used for separating charged species (anions or cations) in water.
- inductively coupled plasma optical emission spectroscopy, a method used to detect metal species in water. (see also Spectroscopy)
- liquid chromatography (method) or liquid chromatograph (instrument)
- laboratory control sample
- lab fortified blank – a pure water sample spiked with a known amount of analyte, used for QA/QC purposes
- lab fortified matrix – a field water sample spiked with a known amount of analyte, used for QA/QC purposes
- limit of detection – the lowest quantity in a method that can be considered a true signal and not background noise (similar to MDL)
- limit of quantitation – the lowest quantity in a method that can be considered a true measure of an analyte's concentration
- a symbol for Molarity, a unit of chemical concentration.
- method blank – a pure water sample used during the method to account for any analyte signals picked up in the lab during method processing; used for QA/QC purposes
- (adjusted) method detection limit – the lowest concentration that can be considered a true signal in a method and not background noise
- the chemical symbol of the element magnesium.
- a unit of chemical concentration in units of moles of solute per Liters of solution (mol/L).
- molar mass
- the mass (in grams) of 1 mole (1 mol) of an element or compound. For example, 1 mole of carbon has a mass of 12.01 grams (12.01 g/mol).
- a counting unit (like 'dozen' or 'gross', only much larger) with a value of 6.022x1023. 1 mol carbon = 6.022x1023 carbon atoms.
- the chemical symbol of the element manganese
- matrix spike
- mass spectrometry (method) or mass spectrometer (instrument)
- the chemical symbol for the nitrate polyatomic anion.
- the chemical symbol of the polyatomic anion hydroxide, a deprotonated water molecule (H2O), whose concentration defines the basicity (alkalinity) of water.
- PaDEP (or PADEP)
- Pennsylvania Department of Environmental Protection (PaDEP website)
- the chemical symbol of the element lead.
- a measure of the acidity or alkalinity (basic) of water, calculated by the concentration of H3O+.
- the chemical symbol of the phosphate polyatomic anion.
- parts-per-billion, a unit of dilute solution concentration, equivalent to 1 microgram of material per 1 Liter of water (1 μg/L).
- parts-per-million, a unit of dilute solution concentration, equivalent to 1 milligram of material per 1 Liter of water (1 mg/L).
- reporting limit
- relative percent difference
- Total Dissolved Solids. All that remains from a solution when the water is removed.
- volatile organic compound