From Mass Spectrometry: A Foundation Course

Compound class

Nominal mass loss


Aliphatic hydrocarbons

15, 29, 43, 57, etc.

-CH 3 ,-CH 3CH 2 , ?CH 3(CH 2) n , etc.


-CH 2=CH 2

Aliphatic alcohols

1, 2, 15, 29, 43 etc.

-Ho, ?H 2, ?CH 3 , ?CH 3CH 2 , etc.


-H 2O


-CH 2=CH 2


as above, and 28, 29



31, 45, 59, etc.

-CH 3O , ?CH 3CH 2O , ?CH 3(CH 2) nO , etc.

Aliphatic amines


-NH 3

15, 29, 43, 57, etc.

-CH 3 , ?CH 3CH 2 , ?CH 3(CH 2) n , etc.

Aldehydes and ketones

1, 15, 29, 43, 57, etc.

-H , ?CH 3 , ?CH 3(CH 2) n , etc. (adjacent to C=O group)

Carboxylic acids, esters and amides

28, 43, 57, etc.

-CH 2=CH 2, ?R-CH 2-CH 2, etc. via a McLafferty rearrangement

16 or 17 or 31, 45, 59, etc.

?OH (acid), ? OR (ester) or ?NH 2 (amide)

Alkyl halides

19, 35/37, 79/81, 129

-F , ?Cl , ?Br , ?I (favoured for Br...

Products & Services
Oil in Water Monitors
Oil in water monitors are used to detect the presence of hydrocarbons in water.
ANSI Roller Chain Sprockets
Roller chain sprockets engage chain drives in power transmission and conveyor systems, though sprockets can engage any perforated material. Chain drives can be highly efficient and can produce a mechanical advantage as speed reducers/increasers. Sprockets conforming to ANSI standard B 29.1 are not meant to engage roller chains of any other parameter. ANSI conforming roller chain is smaller and somewhat weaker than its European counterpart.
Washers are disks of metal or non-metallic material placed beneath a nut, an axle bearing, or a joint, to relieve friction, prevent leakage, isolate, prevent loosening, or distribute pressure.
Spring Washers
Spring washers, sometimes called disc springs, lend their mechanical capabilities to the unique profile of the material: the irregularities of the washer compress with a proportionate resistance to return to their predeflected shape. Spring washers are employed in applications where assemblies need a part to take up play, maintain assembly tension, compensate for expansion or contraction in materials, or to absorb intermittent shock loads and provide a controlled reaction under dynamic loads.
Organic Chemicals
Organic chemicals are chemical compounds that contain carbon in their molecular structure.

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