Comparative Investigation of the Spectroscopic Behavior Based on High-Concentrated Solution in Nitrogen and Air Atmospheres.

In addition, the sensitivity difference between the two atmospheres at high concentration was lower than that at low concentration, and the overall sensitivity improvement showed a decreasing trend along with the increase in concentration.

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When the optical path was fixed at 5 mm, the absorption intensity of SO 4 2− ( Figure 1 a,e), S 2− ( Figure 1 b,f), Ni 2+ ( Figure 1 c,g) and Cu 2+ ( Figure 1 d,h) showed an increasing trend along with the increase of concentration.

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