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Flashcards in Unit 3 Deck (36)
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1

T/F- Reagents in colorimetric tubes are designed to change to a specific color when exposed to a specific chemical.

True

2

T/F- Colorimetric tubes have an expiration date.

True

3

T/F- Reagents in colorimetric tubes will only change color when exposed the chemical they are designed to detect.

False

4

T/F- Reagents in colorimetric tubes can change an unexpected color when exposed to a chemical it might be cross sensitive to.

True

5

Name things that will contaminate a combustible gas detector.

Corrosive gases; liquids aspirated into the detector; silicone

6

T/F- A combustible gas detector can function properly in all types of atmospheres.

False

7

In order for the proper operation of a combustible gas detector the oxygen levels in the sampled atmosphere must be:

A.) Oxygen levels don't matter

B.) The minimum oxygen levels varies from manufacturer to manufacturer

B.) The minimum oxygen levels varies from manufacturer to manufacturer

8

What will too high or too low oxygen levels in the sampled atmosphere do to the readings of the combustible gas meter?

A.) Give more accurate readings

B.) Give incorrect readings

B.) Give incorrect readings

9

What pH readings when read from a pH meter should be concerning?

Less than 2 (<2) and greater than 12.5 (>12.5)

10

The presence of which chemicals will give a false elevated oxygen reading?

Chlorine, Oxidizing chemicals

11

When a meter is set to parts per million (ppm) or parts per billion (ppb) the lowest reading you can get is?

1

12

pH paper is used to indicate the approximate strength of?

Acids and Bases

13

What types of chemical detection devices can be used to determine explosive atmospheres?

OVA- Organic Vapor Analyzer

PID- Photo Ionization Detector

Wheatstone Bridge Circuit (Traditional CGI)

14

1% by volume equals how much parts per million (ppm)

10,000 ppm

15

1% by volume equals how much parts per billion (ppb)

10,000,000 ppb

16

For an indoor natural gas release at what LEL threshold should you delineate your hotzone?

10% LEL

17

For an outdoor natural gas release at what LEL threshold should you delineate your hotzone?

20% LEL

18

Can Carbon Dioxide influence oxygen detected by oxygen detectors? Explain your answer.

Yes. High concentrations of carbon dioxide, or any other gas given the right situation, can physically displace the oxygen available in the area.

19

Does atmospheric pressure influence the amount of oxygen a oxygen detector sees?

Please explain.

Yes. Above sea level the atmosperic pressure begins to drop and as the atmospheric pressure drops the air becomes thinner so a oxygen detector will see less oxygen molecules passing in front of it.

20

Define Vapor Density

The weight of vapor contained in a container when compared to the weight of dry air in a container of similar volume.

21

Should the atmospheres of confined spaces be monitored prior to and during entry? Explain your answer.

Yes. For life safety reasons confined spaces should be monitored for several hazards including explosive, asphyxiant and toxic gases.

22

Can a carbon monoxide detector be used to determine the identity of a liquid product?

No

23

Which detection methods might be used to detect nerve agents?

M8/M9 paper

Surface Acoustic Wave (SAW)

24

What is the first priority of monitoring?

Safety

25

What is the first hazard a haz mat technician samples for?

Radioactivity

26

What are the radiation limits found at 1 meter from the outer package surface for the three levels of radioactive materials with intact packages and the associated color of their labels?

Level I = Almost none at 1 m; 0.5 mrem/hr @ surface, White label

Level II = max. 1 mrem/Hr @ 1 m; 50 mrem/hr @ surface, Yellow label

Level III = max. 10 mrem/Hr @ 1 m; 200 mrem/hr @ surface, Yellow label

27

Explain correction factor or relative response as it pertains to calibration gas for a combustible gas instrument (CGI).

The correction factor of a calibration gas is the ratio of how much hotter or colder a flammable gas burns in reference to the known calibration gas used on the instrument. This ratio can then be used to determine the percent of flammable gas that is present in the atmosphere being sampled.

28

T/F- Colorimetric tubes have a high margin of error.

True; +/- 25-30%

29

T/F- Colorimetric tubes are not designed to measure concentrations below 10,000 ppm

False

30

This method of detection consists of numerous piezoelectric crystals coated with a polymer film that specifically absorbs a particular class of volatile compound. The absorption of these volatile compounds to their specific piezoelectric crystal cause that crystal to vibrate differently than it normally would. By monitoring the vibrational changes across the different array of crystals a chemical pattern or fingerprint can be detected and used to identify the compound.

Surface Acoustic Wave (SAW)