Campbell TGA200 User Manual download pdf (Page 3)

Laser-based Isotope Ratio Analyzers: The Issues

• Isotope scale calibration, two point scale fixation and contraction/expansion

• Amount/concentration dependence

• Memory effects

• Matrix effects

• Water vapor measurements: calibration against liquid standard materials

• Intercomparison between instruments and laboratories (ring tests)!

• Trained operator? In isotope issues certainly, but what about the ‘black’

box?

• Supply of standard materials in a form adapted to laser instruments

• Sensitivity of the instruments – how much material is needed (nanomols?)

• Field applications, environmental impacts, temperature gradients and speed

of temperature changes, …

• Good laboratory practices, reporting uncertainties

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Campbell TGA200 User Manual Page 3