24.04.2015 Views

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

APPENDIX C<br />

basis and at a frequency of at least 1 per every 20 samples. The RPD between duplicates or<br />

matrix spike duplicates measures the precision of a given analysis. RPDs are calculated as<br />

follows:<br />

%RPD =<br />

%RPD =<br />

R - R<br />

S<br />

1<br />

R<br />

or<br />

1<br />

S<br />

av<br />

- S<br />

av<br />

2<br />

2<br />

x 100<br />

x 100<br />

where,<br />

R 1 and R 2 = duplicate determinations of the analyte in the sample<br />

S 1 and S 2 = the observed concentrations of analyte in the spike and its duplicate<br />

R av<br />

S av<br />

= (R1+R2)/2<br />

= (S1+S2)/2<br />

Laboratory Control Sample (LCS)/Laboratory Control Sample Duplicate (LCSD)—<br />

Laboratory control standards are aliquots of organic-free or deionized water to which known<br />

amounts of analyte have been added for water matrices. Other reference materials may be<br />

used for other matrices. They are subjected to the sample preparation or extraction<br />

procedure and analyzed as samples. The stock solutions used for LCSs are purchased or<br />

prepared independently of calibration standards. The LCS recovery tests the function of<br />

analytical methods and equipment. LCS/LCSDs are prepared and analyzed on a daily basis<br />

or at a frequency of 1 per 20 samples. Laboratory control limits are calculated when 20 data<br />

points become available.<br />

In addition to the aforementioned QC samples, the following QC parameters are utilized as part of the<br />

QA/QC program for environmental samples collected at Kirtland AFB:<br />

Holding Times—Holding time compliance (see Table 5-1) is carefully monitored through<br />

internal laboratory procedures.<br />

ICP Interference Check Samples—These samples are run, as necessary, as a check on interelemental<br />

interferences during ICP analyses.<br />

Single Spike Analysis for Metals Analyzed by Furnace—Each sample is run as a postdigestion<br />

spike. Where matrix interference is indicated, the sample is run by Method of<br />

Standard Additions (MSA).<br />

ICP Internal Standardization—Internal standardization is an acceptable substitute for MSA<br />

in ICP analyses, and may be used by the analytical laboratory.<br />

ICP Linear Ranges—Are evaluated on a quarterly basis and will be reported by the<br />

analytical laboratory.<br />

Kirtland AFB<br />

Quality Assurance Project Plan C-45 April 2004

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!