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catalog #lengthidmodificationunits
9161531
30 mm
1.0 mm
ea.
9161551
50 mm
1.0 mm
ea.
9161511
100 mm
1.0 mm
ea.
9161561
150 mm
1.0 mm
ea.
9161521
200 mm
1.0 mm
ea.
9161571
250 mm
1.0 mm
ea.
9161532
30 mm
2.1 mm
ea.
9161552
50 mm
2.1 mm
ea.
9161512
100 mm
2.1 mm
ea.
9161562
150 mm
2.1 mm
ea.
9161522
200 mm
2.1 mm
ea.
9161572
250 mm
2.1 mm
ea.
9161533
30 mm
3.2 mm
ea.
9161553
50 mm
3.2 mm
ea.
9161513
100 mm
3.2 mm
ea.
9161563
150 mm
3.2 mm
ea.
9161523
200 mm
3.2 mm
ea.
9161573
250 mm
3.2 mm
ea.
9161535
30 mm
4.6 mm
ea.
9161555
50 mm
4.6 mm
ea.
9161515
100 mm
4.6 mm
ea.
9161565
150 mm
4.6 mm
ea.
9161525
200 mm
4.6 mm
ea.
9161575
250 mm
4.6 mm
ea.
9161532-700
30 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161552-700
50 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161512-700
100 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161562-700
150 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161522-700
200 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161572-700
250 mm
2.1 mm
with Trident Inlet Fitting
ea.
9161533-700
30 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161553-700
50 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161513-700
100 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161563-700
150 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161523-700
200 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161573-700
250 mm
3.2 mm
with Trident Inlet Fitting
ea.
9161535-700
30 mm
4.6 mm
with Trident Inlet Fitting
ea.
9161555-700
50 mm
4.6 mm
with Trident Inlet Fitting
ea.
9161515-700
100 mm
4.6 mm
with Trident Inlet Fitting
ea.
9161565-700
150 mm
4.6 mm
with Trident Inlet Fitting
ea.
9161525-700
200 mm
4.6 mm
with Trident Inlet Fitting
ea.
9161575-700
250 mm
4.6 mm
with Trident Inlet Fitting
ea.

Application-dedicated HPLC columns have longer lifetimes

Prolong the useful lifetimes of your HPLC columns by dedicating specific columns to specific applications, like analysts who use ion pair reagents often do. Sample components, mobile phase conditions, etc. can cause changes within a column, and sometimes effects of these changes are negligible until the column is used in another application. Although this practice can involve using more columns at one time, and calls for careful bookkeeping, longer lifetimes for individual columns can amount to significant savings.

Avoid the Void Volume

A speedy analysis is important, but avoid the temptation to elute important sample components near the void volume of your column. When you ignore this guideline, you are locked into using the mobile phase as the sample solvent; any admixing of sample solvent and mobile phase causes a baseline disturbance that makes quantification highly unreliable. Also, it is highly likely that the peak at the void volume will soar off-scale. You will avoid these and other potential problems by adjusting conditions such that the first target compound elutes with a capacity factor (k′) of at least 2.0.