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Atomic Absorbance problem in Spectrophotomerer  280Z AA

bala

Atomic Absorbance Spectrophotomerer (Agilent Company, USA) with the Model of 280Z AA., some problems as I told before. We cleaned the furnace, Graphite and Optical lenses. When we run the Arsenic heavy metals, for blank         (De-ionized water), we heat red heat flame/emission in the furnace. But during standard, we are not getting those red flame/emission. So we get less value of absorbance (0.03) than the value we got 15 days before (0.1) for 20ul of 1ppm standard solution. so when we run the sample blank and sample, we get over value like that. We need your valuable idea to solve this problem. With best regards, 

thank you.

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    Hello Bala,

     

    I'm wondering about the condition of the graphite tube and the electrodes at either side of the workhead. If the electrode is worn, there can be poor electrical connection to the graphite tube - this can show up as the problem you reported.

     

    When was the graphite tube last replaced and do you know how long this has been in use (how many firings it has had)?

     

    When were the electrodes last replaced?

    You can check the condition by opening the RHS of the workhead - and checking the condition of the electrodes. The surface should be smooth - no pitting and there should not be any residue on the surface. You can clean them with a Q-tip dipped in water to remove any build-up

     

    With the workhead open, you can also remove the graphite tube and check the condition of the tube. If the outside surface of the tube is quite black and does not have a smooth surface, it is likely to need replacement.

     

    Hope that helps you,

    Cheers Eric

Reply
  • 0

    Hello Bala,

     

    I'm wondering about the condition of the graphite tube and the electrodes at either side of the workhead. If the electrode is worn, there can be poor electrical connection to the graphite tube - this can show up as the problem you reported.

     

    When was the graphite tube last replaced and do you know how long this has been in use (how many firings it has had)?

     

    When were the electrodes last replaced?

    You can check the condition by opening the RHS of the workhead - and checking the condition of the electrodes. The surface should be smooth - no pitting and there should not be any residue on the surface. You can clean them with a Q-tip dipped in water to remove any build-up

     

    With the workhead open, you can also remove the graphite tube and check the condition of the tube. If the outside surface of the tube is quite black and does not have a smooth surface, it is likely to need replacement.

     

    Hope that helps you,

    Cheers Eric

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