ACS Instrumental Analysis Exam 2026 Questions and Answers

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ACS Instrumental Analysis Exam 2026 Questions and Answers

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Course Instrumental Analysis

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ACS Instrumental Analysis Exam 2026 Questions and Answers

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ACS Instrumental Analysis Exam 2026
Questions and Answers

UV-Vis Source (Mono or Poly) - Correct answer-W-Halogen lamp; D2 or

H2Lamp; Xenon Lamp:(poly)

IR Source (Mono or Poly) - Correct answer-Nernst Glower; Globular;

Incandescent: (Poly)

Laser(Mono)

AA Source (mono or Poly) - Correct answer-HCl(mono)

AE Source (Mono or Poly) - Correct answer-Plasma Falme(poly)

Raman Source (mono or Poly) - Correct answer-He/Ne Laser;Ar Laser;Yag

Laser:(mono)

UV-Vis Sample Holder - Correct answer-Quartz, Glass, Plastic Cuvettes

IR Sample Holder - Correct answer-salt plat; gas chamber

AA Sample Holder - Correct answer-Graphite Tube; Flame

©COPYRIGHT 2025, ALL RIGHTS RESERVED 1

,AE Sample Holder - Correct answer-inductively coupled plasma (ICP)

Raman Sample Holder - Correct answer-Cuvette

UV-Vis Wavelength Selector - Correct answer-Grating, Prism, Filter

IR Wavelength Selector - Correct answer-Interferometer; monochromator

AA Wavelength Selector - Correct answer-Monochrom. w/ grating

AE Wavelength Selector - Correct answer-Monochrom.

Raman Wavelength Selector - Correct answer-Monochrom. w/ grating; Infermom.

w/ laser

UV-Vis Detector - Correct answer-Photomultiplier Tube(PMT); Photodiode Array

IR Detector - Correct answer-Thermal(dispersion); pyroelectric; photoconducting

AA Detector - Correct answer-PMT

AE Detector - Correct answer-PMT; Photodiode Array

Raman Detector - Correct answer-PMT

HPLC Mobile Phase - Correct answer-Rev Phase: Polar Solvent

Norm. Phase: Nonpolar Solvent

GC Mobile Phase - Correct answer-He Gas
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2

,HPLC Column Length - Correct answer-10-30 cm

GC Column length - Correct answer-30-50 m

HPLC Modes of Operation - Correct answer-1. Isocratic

2. Gradient

GC Modes of Operation - Correct answer-1.Isothermal

2. Temp program

HPLC Injection System and Amount - Correct answer-Loop System (10uL)

GC Injection Syst. and Amount - Correct answer-Syringe (3-5uL)

HPLC Sationary Phase - Correct answer-NP=Polar

RP=Nonpolar

HPLC Detector - Correct answer-Z cell (UV)

GC Detector - Correct answer-FID (flame ionization detector)

HPLC Pump - Correct answer-Reciprocating

Displacement

HPLC Chromotography - Correct answer-1. Partition

©COPYRIGHT 2025, ALL RIGHTS RESERVED 3

, 2. Adsorption

3. Ion Exchange

4. Size Exclusion

5. Affinity

what are the difference between calibration sensitivity and analytical sensitivity -

Correct answer-calibration sensitivity is the slope of a calibration curve at the

concentration of interest while analytical sensitivity is a response to the noise ratio

how to calculate calibration sensitivity - Correct answer-y=mx+b (m is the

calibration sensitivity)

graph concentration vs mean analytical signal

how to find the analytical sensitivity - Correct answer-As (concentation) =

calibration sensitivity/SD [ ]

how to find the coefficient of variation for the mean of each of the replicate sets -

Correct answer-CV = SD/Average x 100

how to find the detection limit for method? - Correct answer-

3.3*SD(blank)/calibration sensitivity

voltage in a series - Correct answer-Vt = Vc + Vb + Va
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4

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