3.b Instrumentation & Automation Flashcards

Beer-Lamber Law to Reflectance Spectrophotometer

1
Q

states that absorbance (optical density) is directly proportional to concentration

A= 2-log%T
A= abc

A

Beer-Lamber Law

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2
Q

Graph of Beer’s Law will show a straight line if:

Concentration vs Absorbance are plotted using

A. LINEAR PAPER
B. SEMILOG PAPER

A

A

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3
Q

Graph of Beer’s Law will show a straight line if:

Concentration vs Transmittance are plotted using

A. LINEAR PAPER
B. SEMILOG PAPER

A

B

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4
Q

Used to correct for interferences attributed from the sample:

A. Reagent Blank
B. Sample Blank

A

B

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5
Q

Interferences attributed from the sample

A

icteric, xanthrochromic

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6
Q

used to correct for interferences attributed from rgt

A. Reagent Blank
B. Sample Blank

A

A

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7
Q

Part of the spectrophotometer that isolates the specific wavelength of interest (desired wavelength):

A. MONOCHROMATOR
B. PHOTODETECTOR

A

A

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8
Q

All of the following are monochromator except?

A. Prisms
B. Colored Glass Filters
C. Barrier Layer Cell
D. Diffraction Gratings
E. Interference Filters

A

C

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9
Q

Part of spectrophotometer that converts light to electrical energy:

A. MONOCHROMATOR
B. PHOTODETECTOR

A

B

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10
Q

Which among the examples of Photodetector is the most sensitive?

A. barrier layer cell
B. photodiode
C. photomultiplier tube

A

C

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11
Q

Instrument with 2 photodetectors

A. DBSS
B. Fluorometer
C. FEP
D. AAS
E. Reflectance Spectrophotometer

A

A. DOUBLE BEAM IN SPACE SPECTROPHOTOMETRY

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12
Q

Instrument with 2 monochromators, positioned at 90deg:

A. DBSS
B. Fluorometer
C. FEP
D. AAS
E. Reflectance Spectrophotometer

A

B

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13
Q

Fluorometer

Characteristics of fluorescent light:

A. HIGH ENERGY, SHORT WAVELENGTH
B. LOW ENERGY, LONGER WAVELENGTH

A

B

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14
Q

Fluorometer

Characteristics of excitation light:

A. HIGH ENERGY, SHORT WAVELENGTH
B. LOW ENERGY, LONGER WAVELENGTH

A

A

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15
Q

Disadvantage of Fluorometry:

A

Quenching

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16
Q

Fluorometry

Effect of Quenching in fluorescence:

A

DECREASED FLUORESCENCE

17
Q

Instrument that measures the light/color emitted by the analyte; used for analytes that are easily excited by the flame

A. DBSS
B. Fluorometer
C. FEP
D. AAS
E. Reflectance Spectrophotometer

A

C. FLAME EMISSION PHOTOMETER

18
Q

FLAME EMISSION PHOTOMETER

Color emitted by Na =

A. YELLOW
B. VIOLET
C. RED

19
Q

FLAME EMISSION PHOTOMETER

Color emitted by K =

A. YELLOW
B. VIOLET
C. RED

20
Q

FLAME EMISSION PHOTOMETER

Color emitted by Li =

A. YELLOW
B. VIOLET
C. RED

21
Q

Dilution of serum used in Na/K analysis in FEP

A

1:100 or
1:200

22
Q

Modern FEP uses?

23
Q

This may be detected in spx;
used for Bipolar Disorder/Manic Depression

24
Q

Internal standards used in FEP

A. Li
B. Cs
C. Either
D. Neither
E. Both

A

E. Both LITHIUM, CESIUM

Note: Internal standards should not be present in the spx

25
Q

Instrument used for analytes that are NOT EASILY excited by the flame; serves as reference method for CALCIUM and MAGNESIUM

A. DBSS
B. Fluorometer
C. FEP
D. AAS
E. Reflectance Spectrophotometer

A

D. ATOMIC ABSORPTION SPECTROPHOTOMETER

26
Q

ATOMIC ABSORPTION SPECTROPHOTOMETER

Light source

A

HOLLOW CATHODE LAMP

27
Q

ATOMIC ABSORPTION SPECTROPHOTOMETER

Purpose of flame

28
Q

ATOMIC ABSORPTION SPECTROPHOTOMETER

After analyzing an analyte, the _ must be changed first, before proceeding with the analysis of the next analyte

A

hollow cathode lamp (light source coated w/ the element being measured)

29
Q

Instrument that measures reflected light; serves as the principle behind Vitros, Kodak Ektachem and Automated Dipstick Readers:

A. DBSS
B. Fluorometer
C. FEP
D. AAS
E. Reflectance Spectrophotometer

A

E. Reflectance Spectrophotometer

30
Q

REFLECTANCE
SPECTROPHOTOMETER

Dry Slide Technology (layers; top to bottom)

A. Spreader → Reagent → Scavenger → Support/Basal → Indicator
B. Spreader → Scavenger → Reagent → Indicator → Support/Basal
C. Spreader → Indicator → Reagent → Scavenger → Support/Basal
D. Support/Basal → Indicator → Reagent → Scavenger → Spreader

A

B. Spreader → Scavenger → Reagent → Indicator → Support/Basal