Fluctuations in Shimadzu atomic absorption values
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A graphite furnace was used; the operation steps seemed fine. However, during the testing, the results for empty burning were 0.7 on the first attempt, which seemed too high. The values were 0.18 on the second attempt, 0.44 on the third, -1 on the fourth, and 0.87 on the fifth. After that, the values were mostly -1. I don’t know why, but even by changing the element, it still shows -1. Please advise. The graphite tube is new; it’s a pyrolysis tube. I really can’t think of any other places where there might be problems. Device AA-7000.
The first reason might be that the lens in the optical path is dirty; it can be wiped clean； Secondly, the reason for negative values might be that the zero point of the optical path has changed; the zero point can be adjusted.
An energy balance greater than 100 is relatively better for stability.
Which lens does it refer to? I went back to check at 0 o’clock; it was still fine, but the data for the blank baseline was indeed very high.
And yesterday, when using the hydride generator again, there was a frequent need to switch to standard solutions of different concentrations, yet the absorption values remained essentially unchanged; I’m not sure what’s going on.
In this diagram, the two lenses that are level with the graphite tube – wipe them with lens paper to see the effect; otherwise, the purity is low, or it’s time to replace the graphite tube
Also, we require that the tubes with blank interiors be new.
Consultation on the fault diagnosis of Shimadzu molecular pumps – free answers provided
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