Field fortified blank

A set of quality control parameters includes field blank, field fortified blank, md field fortified sample. 

Field Fortified Blanks Analysis of field fortified blanks can help in the identification of chemical interference inherent in the matrix. 

If the fortified sample samples continue to fall outside the control range, despite the positive results obtained after the field fortified blank duplicate analysis, then the results related to the unfortified sample under investigation should be labeled as suspect due to matrix effect. 

After every 10 field samples, analyze a field fortified blank alternating the lower and higher concentration (50 and 500 pg/L of target analyte and 2 pg/L of IS). 

Field Fortified Blank The field blank with the addition of a known concentration of the compound(s) under investigation (in this protocol DCM, TCE, and PCE). 

Fortified field blanks to determine the effects that the matrix might have on analyte recovery. 

The actual mass chromatograms and spectra are received seven days later at which time they are also reviewed. Any discrepancies between the two sets of data are immediately rectified. Data are qualified based on adherence to the method criteria plus the results of the field blank, fortified sample, and performance evaluation sample. Data are qualified as either valid or invalid for remedial site work. 

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