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Appendix B
5/20/2009
7
3.68.
Should -
Denotes a guideline or recommendation whenever noncompliance
with the specification is permissible. (ANSI)
3.69.
Sleeve
- Nickel - to maintain integrity of the sample capsule and to protect the
quartz ware from devitrification (to destroy the glassy qualities by prolonged
heating).
3.70.
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.
3.71.
Trap
- Used for removing water and CO
2
from the sample gas.
3.72.
Tissue sample
– Plant or animal tissue dried and ground ready for weighing.
3.73
Zero Value
- Bridge signal with only pure helium flowing through the
detector.
4.
INTERFERENCES
4.1. There are no known interferences for fresh, estuarine or coastal water or sediment
samples. The presence of C and N compounds on laboratory surfaces, on fingers, in
detergents and in dust necessitates the utilization of careful techniques (i.e., the use
of forceps and gloves) to avoid contamination in every portion of this procedure
(EPA.)
5.
SAFETY
5.1.
Safety precautions must be taken when handling reagents, samples and equipment in
the laboratory. Protective clothing including lab coats and safety glasses and
enclosed shoes must always be worn. In certain situations it may also be necessary
to use gloves and goggles. If solutions or chemicals come in contact with eyes, flush
with water continuously for 15 minutes. If solutions or chemicals come in contact
with skin, wash thoroughly with soap and water. Contact Solomons Rescue Squad
(911) if emergency treatment is needed and also inform the CBL Business Manager
of the incident. Contact the CBL Business Manager if additional treatment is
required.
5.2. The toxicity or carcinogenicity of each reagent used in this procedure may not have
been fully established. Each chemical should be regarded as a potential health
hazard and exposure should be as low as reasonably achievable. Cautions are
included for known extremely hazardous materials and procedures.
5.3. High current and voltages are exposed near the furnaces, furnace control card, and
mother board even while the 440 is OFF. If non-electrical trouble shooting is
desired, remove the 440 line cord from the wall receptacle.
5.4. The combustion tube is brittle since it is fused quartz. Do not put any unnecessary
stress on it.
5.5. The exterior of the furnace becomes extremely hot; do not touch it or the heat shield
unless wearing appropriate gloves.