Basic HTML Version
Appendix B
5/20/2009
10
8.3.
Sediment, Tissue, or Soil Sample Collection – Sediment samples are collected with
benthic samplers. The type of sampler used will depend on the type of sample
needed by the data-quality objectives. Tissue and soil samples are collected by a
variety on methods. Store the wet sample in a clean jar and freeze at -20
o
C until
ready for analysis. Dry samples in a low temperature (47
o
C+/-2
o
C)) drying oven, and
grind to a homogenous powder with a mortar and pestle, prior to analysis.
8.3.1.
The amount of solid material collected will depend on the sample matrix. A
minimum of 1 g is recommended.
8.3.2.
Filtration Volume Selection Guide
25mm Filter
Sample
Matrix
Open Ocean
500 – 1000 ml
Coastal
400 – 500 ml
Estuarine
(Low
particulate)
250 – 400 ml
Estuarine
(High
Particulate)
25 – 200 ml
9.
QUALITY CONTROL
9.1. The laboratory is required to operate a formal quality control (QC) program. The
minimum requirements of this program consist of an initial demonstration of
laboratory capability and the continued analysis of laboratory instrument blanks field
duplicates, and calibration standards analyzed as samples as a continuing check on
performance. The laboratory is required to maintain performance records that define
the quality of data generated.
9.2.
Initial Demonstration of Capability
9.2.1.
The initial demonstration of capability (DOC
) – is used to
characterize instrument performance (MDLs) and laboratory
performance (analysis of QC samples) prior to the analyses conducted
by this procedure.
9.2.2.
Quality Control Sample (QCS/SRM)
– When using this procedure, a
quality control sample is required to be analyzed at the beginning or
middle and end of the run, to verify data quality and acceptable