Division of Spill Prevention and Response

Breadcrumbs

PROJECT: DeLong Mountain Terminal
PARAMETER: Metals
LABORATORY: Battelle Sequim
MATRIX: Salmon Berries
SAMPLE CUSTODY: Eighty samples, including one water sample, were received on 8/23/01. All containers were received in good condition. The cooler temperatures upon receipt were 2.5° C, 3.1 and 5.6° C. Samples were entered into Battelle’s log-in system. This data report is for 20 samples.

QA/QC DATA QUALITY OBJECTIVES:

  Reference Method Range of Recovery SRM Accuracy Relative Precision Target Detection Limit (ug/g) Achieved Detection Limit (ug/g)
Cobalt ICP-MS 75-125% £ 25% £ 25% 0.5 0.003
Cadmium ICP-MS 75-125% £ 25% £ 25% 0.05 0.01
Chromium ICP-MS 75-125% £ 25% £ 25% 0.5 0.03
Copper ICP-MS 75-125% £ 25% £ 25% 0.2 0.02
Lead ICP-MS 75-125% £ 25% £ 25% 0.05 0.02
Manganese ICP-MS 75-125% £ 25% £ 25% 0.1 0.01
             
Nickel ICP-MS 75-125% £ 25% £ 25% 0.5 0.04
Selenium ICP-MS 75-125% £ 25% £ 25% 1.0 0.5
             
Zinc ICP-MS 75-125% £ 25% £ 25% 1.0 0.02

 

METHODS: Nine metals were analyzed: cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), lead (Pb), manganese (Mn), nickel (Ni), selenium (Se), and zinc (Zn). The samples were digested using nitric acid. All metals were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) following EPA Method 6020. Dry weight was determined by freeze drying.
BLANKS: Cu and Zn were detected in the blank. Both were detected at a concentration less than 5 times the MDL and an order of magnitude lower than the sample concentrations; therefore no corrective action was taken.
MATRIX SPIKES: One matrix spike/matrix spike duplicate pair was analyzed. Recoveries of all metals were within QC limits of 75-125% and all RPDs were less than 25%.
REPLICATES: One sample was analyzed in duplicate. Precision is reported by calculating the relative percent difference (RPD) of replicate results. RPDs for all metals were within the QC limits of ± 25%, except for Pb at 31%. Mn was not spike at a high enough concentration to provide useful data.
SRM and LCS: Two SRMs, MOSS M3 and Lichen IAEA 336 were analyzed. All results were within the QC recovery of 75-125%, except for Zn in lichen. The LCS sample, NIST 1640 trace metals in water, was run twice. Se recovery was above 125%.