sample capacity - refers to the amount of sample that can be injected onto a LC column without overload. Often expressed as grams of sample per gram of packing. Overload is defined as the sample mass injected at which the column efficiency falls to 90% of its normal value.

sample loop - a loop of calibrated volume used in a sample injection valve; normal volumes range from 5 to 100 microliters.

sample valve - syn. injection valve; a device used to inject fixed volumes of liquid sample; may be operated manually or automatically; provides very reproducible injection volumes.

See injection valve.

SAX - strong anion exchanger. A typical strong anion exchange functional group would be tetraalkylammonium.