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Appendix A
5/20/2009
5
3.37
Sensitivity – The capability of a test method or instrument to
discriminate between measurement responses representing different
levels (concentrations) of a variable of interest.
3.38
Shall – Denotes a requirement that is mandatory whenever the criterion
for conformance with the specification requires that there be no
deviation. (ANSI)
3.39
Should – Denotes a guideline or recommendation whenever
noncompliance with the specification is permissible. (ANSI)
3.40
Standard Reference Material (SRM) – Material which has been certified
for specific analytes by a variety of analytical techniques and/or by
numerous laboratories using similar analytical techniques. These may
consist of pure chemicals, buffers, or compositional standards. The
materials are used as an indication of the accuracy of a specific
analytical technique.
4.
INTERFERENCES
4.1
Excessive residue may form a water trapping crust. Sample size should
be limited to yield < 200 mg of residue.
4.2
Samples from saline waters will not weigh to a constant weight.
Therefore they must be rinsed with copious amounts of distilled water.
5.
SAFETY
5.1
Safety precautions must be taken when handling reagents, samples and
equipment in the laboratory.
5.2
The muffle furnace becomes extremely hot. Use care when removing
crucibles from the furnace. Be sure they have cooled to the touch. Use
gloves or tongs if necessary.
6.
EQUIPMENT AND SUPPLIES
6.1
A four place analytical balance.
6.2
Desiccator with drying agents such anhydrous calcium sulfate or silica.
6.3
Muffle furnace capable of heating to 550° C.
6.4
Freezer, capable of maintaining -20°
±
5
°
C.
7.
REAGENTS AND STANDARDS
7.1
Purity of Water – Unless otherwise indicated, references to water shall
be understood to mean reagent water conforming to ASTM Specification
D 1193, Type I. Freshly prepared water should be used for making the
standards intended for calibration. The detection limits of this method
will be limited by the purity of the water and reagents used to make the
standards.
7.2 Blanks – ASTM D1193, Type I water is used for the LRB.