AutoBlockTM is The Automated HotBlock for Metals Digestions.

The entire digestion process takes place in a controlled HEPA filtered environment.

The AutoBlock digests up to 54 samples simultaneously in accordance with EPA digestion protocols or a user-designed digestion program. The AutoBlock controls temperature, ramp rate, digestion time and automatically adds up to five different reagents during the digestion process. All steps are performed in a self-contained, HEPA-filtered environment.

The AutoBlock uses a Microsoft* Windows-based PDA (personal desk assistant) to control all parameters of the digestion process. Stored in permanent memory of the PDA are programs for EPA 200.2, EPA 200.7, EPA 200.8, EPA 3050B and EPA 200.8, as well as methods 7470A, 7471 and 245.1 for mercury.

To operate, the analyst chooses a method, loads samples into the AutoBlock, closes the door and presses the start button. The AutoBlock dispenses the appropriate amount of reagent to the samples, lowers them into the heated block and holds the temperature at the desired level. When the procedure calls for additional reagents to be added, the AutoBlock lifts the samples, turns off the heat and cools the samples to <40°C with HEPA-filtered air. After cooling, reagents are safely added to the samples. The samples are then lowered, the block heats and digestion continues. When digestion is complete, the samples are raised out of the block for cooling and the heat source is turned off.

With the AutoBlock, the greatest source of digestion variability, that of the operator, is eliminated. Digestion temperatures remain uniform from run to run. Heating times, reagent additions and total digestion times are automatically timed and performed on schedule. This uniformity improves productivity and provides consistent results.

To receive your FREE copy of Ai Scientific's Environmental catalogue or to request a quote, please phone 1300 133 063 AU or 0800 95 10 10 NZ or email a description and part number to aimail@aiscientific.com