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3 • Operation and Maintenance
diluting with eluent minimizes the effect of the water dip at the
beginning of the chromatogram. If you dilute the sample with eluent,
use eluent from the same lot to prepare the calibration standards, also.
This is most important for fluoride and chloride, which elute near the
water dip.
•
To improve the accuracy of early eluting peak determinations (such as
fluoride) at concentrations below 50 ppb, dilute standards in eluent or
spike the samples with concentrated eluent to minimize the water dip.
For example, spike a 100 mL sample with 1.0 mL of a 100X eluent
concentrate.
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Doc. 155028-01 08/20
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