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Morag > Hap Mo > Flashcards

Hap Mo Flashcards

1
Q

GC/MS stands for

A

Gas chromatograph/ Mass spectrometer

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2
Q

What functions are performed by the MS part of hapsite?

A
  • Detection
  • Ionisation
  • Filtering of ions
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3
Q

The GC separates compounds using what criteria

A

Boiling point

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4
Q

What is the scan range on the Hapsite using default methods?

A

45-300 AMU

Atomic Mass Units

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5
Q

From cold how long does it take to get a hapsite up and running?

A

20 mins +

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6
Q

What is the 2 function of the internal standard?

A

To be injected as a standard in Analyze methods and for tuning

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7
Q

Is the hapsite intrinsically safe?

A

No

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8
Q

Liquids can and should be drawn up the probe.

True or false?

A

False

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9
Q

What is the ambient temp range of the hapsite?

A

0-45c

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10
Q

What % of a battery is used to start the hapsite from cold?

A

40%

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11
Q

How long does it take to re-charge a flat battery

A

15-20 hours

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12
Q

What is the normal battery life

A

2-3 hours

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13
Q

How many batteries do u need to do a hot swap?

A

3

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14
Q

What does the Neg do?

A

Helps maintain the vacuum in the mass spectrometer

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15
Q

At what pressure should the Neg be replaced

A

6e -03

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16
Q

For a chemical to be detected by the hapsite what should it’s boiling point be?

A

> 250c

Less than

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17
Q

What range of PH is safe for the hapsite?

A

2-11

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18
Q

The hapsite detects compounds that are?

A

Organic

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19
Q

Which best describes the type of compound detectable by the hapsite?

A

Volatile

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20
Q

What is the max number of carbons a chemical can have to be detected by the hapsite?

A

12

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21
Q

What are the names of the library’s used by hapsite?

A

NIST and AMDIS

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22
Q

What must be the concentration of a chemical to be detected using survey mode.

A

Great than 10ppm

23
Q

What must be the concentration of a chemical to be detected using GC/MS loop method?

A

Low ppm to high ppb

24
Q

What method can be used as a quick screening tool?

A

Survey

25
Q

The proper sampling technique when running a survey is:

A

Background for 1 min then sample for voc

26
Q

What must u do when loop fill is in progress?

A

Hold the probe over the sample

27
Q

The NIST library is?

A

A very large library >190,000 of chemicals with a known mass spectrum

28
Q

The AMDIS library is:

A

A small focused library of EPA chemicals and cwa

Contains approximately 750 chemicals

29
Q

How long does it take to fill a loop ?

A

1 min

30
Q

What time would you expect to see the air peak

A

1:20 min

+/-10

31
Q

What time would you expect to see TRIS peak

A

2:30 min

+/-10

32
Q

What time would you expect to see BPFB

A

8 min

+/-10

33
Q

Ratio of TRIS to BPFB

A

1/3 to 1/2 the peak hight

34
Q

Tic max of BPFB

A

1-3 million

35
Q

How long between tunes

A

12 hours

36
Q

What time would you expect to see “the bump”

A

12 min

37
Q

Min pressure for nitrogen
Colour of tin
Min pressure for reservoir
Known as?

A
  • 172 KPA
  • Purple stripe
  • 380 KPA
  • Known as the “carrier” gas
38
Q

Min pressure for internal standard

Colour of tin

A
  • 104 KPA

* Yellow stripe

39
Q

Possible wifi range

A

300 m in line of sight

40
Q

Tic max saturation

A

60 million

41
Q

How long does it take the sample to travel the length of the probe

A

6-7 sec

42
Q

Describe survey mode:

A
  • Draws air sample directly into MS
  • Identifies pure chemicals well
  • More difficult to identify mixtures
  • Looking for an increase in TIC of greater than 2-3 times background level
43
Q

Describe GC/MS mode:

A
  • GC adds separation to MS identification
  • Each sample takes 15mins
  • More sensitive
  • Better identification when sampling mixtures
  • When the data from the survey method is inconclusive and further investigation is desired
  • To confirm survey
44
Q

What should you run before use and why?

A

•A “blank” run

  • A background blank provides:
  • Data on the environmental background
  • Verification that it is working correctly, the internal pressures are acceptable and the gas flow rate are in acceptable range
45
Q

What are you looking for in a good “blank” run?

A
  • Only 3 peaks are present
  • The peaks are the correct ratios
  • Correct retention times
  • The tic max of BPFB is 1-3 million
  • The baseline is <10%
46
Q

What is the temperature of the Neg?

A

400c

47
Q

When should a new Neg be ordered?

A

4E-03

48
Q

Explain why there may be no identification or response whilst operating in survey mode:

A
  • Compound not in library
  • Sample is a mixture
  • A low net fit
  • Sample concentration <10ppm
  • Sample not volatile
  • Sample not in AMU range (45-300)
  • Sample does not contain Carbon
49
Q

What other tools do we have if we have to work in lower temperatures?

A

Pizza bag and probe cover

50
Q

What are the detection requirements?

A
  • Volatile Organic Compound
  • A boiling point below 250c
  • Have a ph of 2-11
51
Q

What is the weight of the Hapsite?

A

20 kg

52
Q

Why is it important to measure ph of unknowns prior to analyses?

A

Too acidic or alkaline samples can corrode internal mechanisms

53
Q

What are the two types of concentrator tubes?

A
  • Tenax

* Tri-bed

54
Q

Sensitivity tree

A

Survey >10ppm

Air GC/MS Loop
Low ppm - High ppb

Air GC/MS Concentrator
Low ppb - High ppt

Morag (8 decks)

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