This method has been briefly studied in an extended for m, appl ied
to exchangeable hydr og en at oms ad jecent to an a cti vati ng group, such as
the c arb onyl gr oup, wi th in the molecule.
Another li1ethod has b een briefly examined and found suitable for
the det ermination of exchang eable hydrogen, on a sampl e of approxi mat ely
10 mil l igrams.
This met hod also has the ad vantage of being non

destructive , but i s J ess sensitive than t h e fi rst method.
It is su[;gest ed tha t this wor k has ol'ened a fi eld for more
extens ive s tud y in

exchang e of lab il e atoms with in or ganic compounds,

and also in the study of surfac e exchang e phenomena.
It is possible to

study the adsorption of water and oth er compounds on various sur f aces ,
studies which up til ] now has been dif f icul t because of the probl em of
examining th e exchanGes und er equil ibrium c onditions.
This is now

possible by techni ques simil a r to thos e discussed in t his work , where
exchanges ha ve been c arried out at all times under condit i ons of
equilibrium.
- 82 -

SUGGESTIONS FOR

FURT H _~R

WORK

It is realized that t his work has been lar gely of a n exploratory
nature and much work is still poss ible to r-er f ect thes e methods.

### Language ###
English

### Assessment ###
The text refers to a study on exchangeable hydrogen samples, and the amount required for the second method mentioned could be a straightforward information request.

### Query ###
How many milligrams of sample are needed for hydrogen exchange analysis?
How many milligrams of sample are needed for hydrogen exchange analysis?