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15.5 ICP-OES Measurement

Concerns with measurement: Precision

• Do not begin the measurement unless the instrument has been allowed to warm up for at least an hour. Addi7onally, working in a temperature-controlled atmosphere is very advantageous. • Clean your introduc7on system and replace the tubing when a) you no7ce an increase in precision when using glass introduc7on systems, b) you no7ce a 'bend or crink' in the Teflon tubing, c) the torch begins to build up residue

15.6 ICP-OES Measurement

Concerns with measurement: Spectral interferences

• The spectral tables are very useful, but they are no replacement for a spectral interference study. These studies should be performed on every instrument when it is installed and at least annually therea9er. • Interference studies are performed by aspira;ng 1000 μg/mL solu;ons of the poten;al interfering element and looking at the spectral regions around possible analyte lines for unwanted spectral interferences. • The types of spectral interferences encountered are direct spectral overlap, wing overlap, and near neighbors that may cause background correc;on problems. • The spectral region for the analyte when a blank solu;on or the possible interfering element solu;on are analyzed are hopefully the same, indica;ng no spectral interference.