Microscale Laboratory Techniques - Handling of Solids

Microscale experiments involve quantities on the order of 200-300 mg at most, and it is thus important to be able to weigh solid substances to the nearest milligram. This requires use of a sensitive top-loading balance protected against drafts with a shield, or an analytical balance.

All weighings must be made into a previously weighed ("tared") container. The tare weight is then subtracted from the total weight of container plus sample to give the weight of the sample.

Solid samples are manipulated using  microspatulas similar to those shown below. The larger style is more useful when relatively large quantities of solid must be dispensed.

wjl; 25-nov-97