This Information Applies To: Agilent VGA 77, AA, VGA 77P, ICP
The Agilent Vapor Generation Accessories VGA 77 and VGA 77P use high concentrations acids. The system needs to be thoroughly cleaned after each use.
The Vapor Generation Accessory 77 (VGA 77) is a vapor generation system for Atomic Absorption (AA) and the VGA 77P is for Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) applications. Unless otherwise specified, both the VGA 77 and VGA 77P will be referred to as VGA 77.
Steps to follow:
Turn off the flame/torch as per instrument procedure. Leave the VGA 77 switched on. If you are using the VGA 77P, leave the ICP pump running.
Run a concentrated hydrochloric acid through the system for 2 to 5 minutes then immerse the three uptake capillary tubes in a container of distilled water (at least 200 mL). Leave the pump running for 10 to 20 minutes to flush the system.
Warning: Risk of severe burns and injury when using concentrated hydrochloric acid. Wear all required personal protective equipment to safety handle concentrated hydrochloric acid. See the MSDS supplied with the hydrochloric acid for further information before use.
Remove the capillary tubes from the distilled water. Leave the pump running until the distilled water has been pumped through the system.
Switch off the VGA 77, but leave the inert gas supply on at the regulator. Open the pressure bar and swing the pump tube beds clear of the pump rollers. Remove the pump tubes from the pump rollers and release them from the retaining bracket. Ensure that they are kept completely clear of the rollers while you carry out the next step.
Switch on the VGA 77. This will allow inert gas to flow through the entire system and minimize the possibility of residual solutions settling in the lowest section of the tubing. Allow the inert gas to flow for about five minutes.
Switch off the VGA 77, and the ICP pump. Inert gas will flow through the separator even with the VGA unit switched off.
Turn off the inert gas supply at the regulator.
Learn how to effectively maintain your Agilent Vapor Generation Accessory by attending an Agilent education e-learning course.