Is the graphite oven heating evenly?
It is possible that at this stage the deuterium lamp signals are negative peaks. That is, molecular absorption is negative.
If all samples have this situation, then the default atomization of the factory before the 3S stopped gas, into the former 1S stop gas, the use of electromagnetic valve to close the delay of internal gas blowing, basically can solve the problem of 0S peak.
There are two kinds of heating methods for general atomic absorption graphite furnace. One is light control mode, the other is current control mode. The light control mode at the beginning of atomization, the temperature exceeds the set temperature, and when the graphite tube is aging, the temperature is more than that. Replace the current control heating up, you try. Or try with a graphite tube.
If in the final stage of ashing, the ashing temperature is certainly too high, and the ashing temperature should be lowered. If there are several possible factors in the pre atomization phase, 1, the temperature is unstable when atomized. 2, the liquid to digest not thoroughly, including part of the organic matter, leading to atomization of different substances in different stages of atomization.
