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Environmental Express
• 17
AutoBlock® Fill:
Operation and Instruction Manual
EPA Method 200.7, Revision 4.4
4.0 Procedure, Total Recoverable Elements, Solids Sample
(EPA Method 200.7, Paragraph 11.3)
4.1 For each digestion procedure, transfer 0.5g ± 0.01g of a dried sieved
sample into the 50mL polypropylene vessel.
4.2 Add 2.0mL (1:1) HNO
3
and 5mL (1:4) HCl and swirl. Cover the vessel with
a disposable watch glass (item # SC505) and reflux an additional
30 minutes at a sample temperature of 85°C.
Note: When using a watch glass, adjust the set point temperature of the HotBlock so
that a 50mL, 5% acid solution is heated to 85°C BEFORE placing the watch glass over the
sample. Laboratory tests have proven that the addition of the ribbed watch glass will add
approximately 10°C to the sample temperature, bringing the sample temperature up to 95°C.
4.3 Allow to cool and bring to 50mL volume with DI water.
4.4 Filter with SC0401 (or appropriate FilterMate® or FlipMate®) to remove
insoluble material.
All QC samples, concentration limitations, elemental lists and reagent specifications
are addressed in depth in EPA Method 200.7. Safety concerns are also part of the full
method. Follow the instructions listed in EPA Method 200.7. These steps should only
be used as a guide to help improve the performance of your HotBlock.