Owner manual

7 Safety, Errors, Troubleshooting, Diagnosis, GLP

746 VA Trace Analyzer / 747 VA Stand

7-44

Enrichment time: 30 s Enrichment time: 120 s

Analysis solution: 20 µg/L Ni; 20 µg/L Co

Supporting electrolyte: 0.1 mol/L NH

Cl/NH

; pH = 9.3

5⋅10

-4

mol/L dimethylglyoxime (DMG)

Standard addition: with 200 ng Ni / 200 ng Co

Electrode: HMDE

• Mercury determination at the gold electrode

On prolongation of the enrichment time from 30 s to 240 s, side peaks ap-

pear during standard addition:

Enrichment time: 30 s Enrichment time: 240 s

Analysis solution: 100 µg/L Hg

Supporting electrolyte: HClO

/HCl

Standard addition: with 1 µg Hg

Electrode: Au-RDE