Asbestos

asbestosair
ASBESTOS ANALYTICAL : AIR SAMPLE QUALITY CONTROL

MICROSCOPE CALIBRATION
Alignment of the phase contrast microscope is verified daily, and proper calibration is recorded in a workstation logbook.

FIELD BLANKS
A field blank is submitted with each set of environmental samples.  Blanks and environmental samples are analyzed with identical procedure.  A contaminated field blanks require correction, qualification, or rejection of the associated sample data.

REFERENCE SAMPLES
Reference samples in 3 fiber ranges are routinely analyzed by all analysts, and used to determine intra and inter counter standard deviations.

DUPLICATE SAMPLES
10% of all samples are reanalyzed to assess variability.  Results are closely monitored relative to statistically established control windows.

PROFICIENCY SAMPLES
Semiannually, Paradigm Environmental analyzes performance evaluation samples from the NYS Department of Health and NVLAP. Samples are received covering air and bulk samples within the certifying categories previously listed.  Analytical results are reported on the proper forms, and statistically evaluated against the pool of laboratory respondents. Results must fall within acceptance limits to maintain certification for category.  Failure to submit acceptance results for two periods in a row results in decertification. 

ASBESTOS ANALYTICAL : BULK SAMPLE QUALITY CONTROL

MICROSCOPE CALIBRATION
Alignment of the polarized light microscope is verified daily, and proper calibration recorded in a work station logbook.

REPLICATE SAMPLES
Ten percent of each analyst’s samples are re-analyzed by another analyst.  These results are compared to check for problems identifying and quantitating asbestos in both friable and non-friable organically bound materials. The results are tabulated daily and quality control charts are printed out monthly.

DUPLICATE SAMPLES
Ten percent of each analyst’s samples are re-analyzed by the same analyst.  These results are compared to check the reproducibility of the analyst’s results. The results are tabulated daily and printed out monthly.

REFERENCE SAMPLE
The laboratory manager supplies the analysts with standard reference samples on a daily basis.  For friable materials, the reference standards are taken from previous rounds of proficiency samples so that a formulated weight is known.  For non-friable organically bound materials, the reference standards are floor tile samples that have been analyzed by transmission electron microscopy.  The results of the T.E.M. analysis are kept in the laboratory manager’s files.  Complete details of QA/QC procedures for asbestos analysis of bulk and air samples are found in NIOSH and ELAP methods manuals, and in the laboratory standard operating procedures.

PROFICIENCY SAMPLES
Semiannually, Paradigm Environmental analyzes performance evaluation samples from the NYS Department of Health. Samples are received covering air and bulk samples within the certifying categories previously listed.  Analytical results are reported on Department of Health forms, and statistically evaluated against the pool of laboratory respondents.  Results must fall within acceptance limits to maintain certification for category.  Failure to submit acceptance results for two periods in a row results in decertification.

INTER-LABORATORY TESTING
Paradigm is required to participate in round-robin testing with at least two other independent laboratories.  Samples are submitted to these laboratories at the rate of one in every two hundred samples analyzed.  This aids in calibrating the analysts against those from other laboratories.