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Definitions

General Laboratory Terms
Metals Terminology
Organic and Inorganic Terminology
Document Reference

 

Metals Terminology

 

ICV: Initial Calibration Verification Standard
This standard is from an external source and is used to validate the calibration standards. It contains all the elements to be analyzed for by the ICAP. The acceptability range is ± 10% of the true value.

 

CCV: Continuing Calibration Verification Standard
This standard is also from an external source and is used to validate the calibration standards and also the calibration curve. It is run every 10 samples and at the end of the run as a closing standard, acceptability criteria is ± 10%.

 

CCB: Continuing Calibration Blank
This standard is used to check the blank standard. This is run every 10 samples and at the end as a closing standard.

 

ICB: Initial Calibration Blank
This has the same function as the CCB but is run only at the beginning of the analysis.

 

ICS AB: Interference Check Standard A & B
A standard that contains 500 ppm concentration of Aluminum, Calcium, Magnesium and 200 ppm of Iron plus the other analytes at a certain level. This gives the analyst the opportunity to see the validity of the IEC’s in the method. Acceptance criteria is ±20%.

 

IEC: Interelement Correction Factor
A mathematical factor that is used to correct for spectral overlap from other elements.

 

Standard Additions
The addition of three increments of a standard solution (spikes) to sample aliquots of the same size. Measurements are made on the original and after each addition. The slope, x-intercept and y-intercept are determined by least-squares analysis. The analyte concentration is determined by the absolute value of the x-intercept. Ideally, the spike volume is low relative to the sample volume. Standard addition may counteract matrix effects; it will not counteract spectral effects.

 

Serial Dilutions
The dilution of a sample by a known factor. When corrected by the dilution factor, the diluted sample must agree with the original undiluted sample within specified limits. Serial dilution may reflect the influence of interference.

 

ICP: Inductively Coupled Plasma
Inductively Coupled Argon Plasma Spectrometer is one technique for analyzing metal samples. An induction coil is wrapped around a quartz tube in which a stream of charge argon particles and sample solute is flowing. The sample must be in solution and is normally introduced through a nebulizer. The interaction between the induced magnetic field from the coil and the argon plasma create an extremely high temperature.

 

Document Reference

 

USEPA, Contract Laboratory Program, Statement of Work for Organic Analysis,
Multi-Media, Multi-Concentration, OLM03.0.

 

USEPA, Contract Laboratory Program, Statement of Work for Inorganic Analysis,
Multi-Media, Multi-Concentration, ILM04.0.

 

USEPA, Test Methods for Evaluating Solid Waste,
Chapter 1 - Quality Control, Volume 1B, Update IIIB, July 1992.

 

 

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