Which combination would be appropriate for a spectrometer to measure absorbance

Question

Which combination would be appropriate for a spectrometer to measure absorbance in the 200-360 nm range? Which technique should be used for measuring trace amounts (ppb) of benzene in hexane? (A) FTIR (B) GC-MS (C) HPLC with UV absorption detector (D) Graphite furnace atomic absorption spectrometry Which material should not be used when storing liquid/solid samples for trace organic analysis? (A) aluminum (B) Teflon(R) (C) glass (D) PVC If the signal-to-noise (S/N) ratio for a signal is 4 after UK) data points have been averaged, how many points should be collected and averaged to ensure a S/N of 8? (A) 200 (B) 300 (C) 400 (D) 600 A signal that ranges from -10 V to +10 V needs to be acquired with a maximum error of 0.4 mV, What is the minimum number of bits that the analog-to-digital convener must have in order to accomplish this measurement? (A) 1.6 bits (B) 12 bits (C) 16 bits (D) 24 bits

Explanation / Answer

1) The region of 200- 360 nm coms under UV region and hence deuterium lamp is used as light source and the sample holder should be made up of quartz, as glass or plastic cuvette absorbs UV radiation in this region. Thus, the correct combination is represented by 'D'

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