CHEM 443 detectors

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13 Terms

1
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what can FID detect

nearly all organic compounds proportional to number of carbons 

2
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what can FID not detect

non hydrocarbons, CO, CO2, NH3, H2S

3
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FID is…

destructive, nearly universal, mass flow rate dependent, and solute property dependent

4
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what factors affect FID

  1. flow rate of combustable gas 2. flow rate of make up gas 3. jet diameter

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what is the linear range of TCD

4 orders of magnitude

6
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TCD is…

universal, nondestructive, concentration dependent, and bulk property dependent

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ECD stands for 

electron capture detector

8
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ECD is used for

halogenated analytes

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ECD is…

selective, concertation dependent, and solute property dependent

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pros of ECD

  1. selective detector for electron capturing compounds (halogens) 2. 10-1000 more sensitive than FID 3. LOD is femtograms 

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cons of ECD

  1. uses radioactive nickel 2. limited linear range 3. cant use solvents with high affinity for electrons (DCM, ACN) 

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MS is…

destructive slective, mass flow rat dependent, and solute property dependent

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SCD

selective and mass flow rate dependent