Hap Mo

Question 1

GC/MS stands for

Answer 1

Gas chromatograph/ Mass spectrometer

Question 2

What functions are performed by the MS part of hapsite?

Answer 2

• Detection
• Ionisation
• Filtering of ions

Question 3

The GC separates compounds using what criteria

Answer 3

Boiling point

Question 4

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

Answer 4

45-300 AMU

Atomic Mass Units

Question 5

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

Answer 5

20 mins +

Question 6

What is the 2 function of the internal standard?

Answer 6

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

Question 7

Is the hapsite intrinsically safe?

Answer 7

No

Question 8

Liquids can and should be drawn up the probe.

True or false?

Answer 8

False

Question 9

What is the ambient temp range of the hapsite?

Answer 9

0-45c

Question 10

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

Answer 10

40%

Question 11

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

Answer 11

15-20 hours

Question 12

What is the normal battery life

Answer 12

2-3 hours

Question 13

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

Answer 13

3

Question 14

What does the Neg do?

Answer 14

Helps maintain the vacuum in the mass spectrometer

Question 15

At what pressure should the Neg be replaced

Answer 15

6e -03

Question 16

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

Answer 16

> 250c

Less than

Question 17

What range of PH is safe for the hapsite?

Answer 17

2-11

Question 18

The hapsite detects compounds that are?

Answer 18

Organic

Question 19

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

Answer 19

Volatile

Question 20

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

Answer 20

12

Question 21

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

Answer 21

NIST and AMDIS

Question 22

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

Answer 22

Great than 10ppm

Question 23

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

Answer 23

Low ppm to high ppb

Question 24

What method can be used as a quick screening tool?

Answer 24

Survey

Question 25

The proper sampling technique when running a survey is:

Answer 25

Background for 1 min then sample for voc

Question 26

What must u do when loop fill is in progress?

Answer 26

Hold the probe over the sample

Question 27

The NIST library is?

Answer 27

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

Question 28

The AMDIS library is:

Answer 28

A small focused library of EPA chemicals and cwa Contains approximately 750 chemicals

Question 29

How long does it take to fill a loop ?

Answer 29

1 min

Question 30

What time would you expect to see the air peak

Answer 30

1:20 min | +/-10

Question 31

What time would you expect to see TRIS peak

Answer 31

2:30 min | +/-10

Question 32

What time would you expect to see BPFB

Answer 32

8 min | +/-10

Question 33

Ratio of TRIS to BPFB

Answer 33

1/3 to 1/2 the peak hight

Question 34

Tic max of BPFB

Answer 34

1-3 million

Question 35

How long between tunes

Answer 35

12 hours

Question 36

What time would you expect to see "the bump"

Answer 36

12 min

Question 37

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

Answer 37

* 172 KPA * Purple stripe * 380 KPA * Known as the "carrier" gas

Question 38

Min pressure for internal standard | Colour of tin

Answer 38

* 104 KPA | * Yellow stripe

Question 39

Possible wifi range

Answer 39

300 m in line of sight

Question 40

Tic max saturation

Answer 40

60 million

Question 41

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

Answer 41

6-7 sec

Question 42

Describe survey mode:

Answer 42

* 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

Question 43

Describe GC/MS mode:

Answer 43

* 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

Question 44

What should you run before use and why?

Answer 44

•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

Question 45

What are you looking for in a good "blank" run?

Answer 45

* 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%

Question 46

What is the temperature of the Neg?

Answer 46

400c

Question 47

When should a new Neg be ordered?

Answer 47

4E-03

Question 48

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

Answer 48

* 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

Question 49

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

Answer 49

Pizza bag and probe cover

Question 50

What are the detection requirements?

Answer 50

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

Question 51

What is the weight of the Hapsite?

Answer 51

20 kg

Question 52

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

Answer 52

Too acidic or alkaline samples can corrode internal mechanisms

Question 53

What are the two types of concentrator tubes?

Answer 53

* Tenax | * Tri-bed

Question 54

Sensitivity tree

Answer 54

Survey >10ppm Air GC/MS Loop Low ppm - High ppb Air GC/MS Concentrator Low ppb - High ppt