I have experienced (-) negative values for a particular element in AAS or ICE-AES analysis.

1. What does this really mean and how could it happen? Can we explain it using the calibration curve?

2. I further have observed that there is the same (-) value for a particular element in different samples and changing (-) value for a particular element in different samples. How can it be explained.

eg.

For Mn: Std are 0.3, 0.5 and 1 ppm in 0.1M HNO3

The samples in 0.1 HNO3 and calculated concentration is -0.035 for all (50) samples

For Ca: Std are 0.5, 1 and 1.5 ppm in 1M HNO3

The samples in 1M HNO3 and calculated concentrations are -0.157, -0.181, -0.199 (changing but (-)so on for all (30) samples.

Thanks in advance

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