Hach-Lange PHOSPHAX sigma Basic User Manual - Manual (Page 107)

English 107
Cross-sensitivity
The ions listed in the table have been individually checked up to the
concentrations specified. The sum effect and the influence of other ions
was not determined by us. The following do not cause malfunctions:
Primary amines are recorded with them and produce excess findings. All
reduction agents disrupt and lead to insufficient findings.
20 g/L SO
4
2––
10 g/L CI –
4 g/L K + , Na +
1 g/L Ca 2+
400 mg/L Mg 2+
200 mg/L
CO
3
2– , NO
2
– , Fe 3+ , Fe 2+ , Cd 2+ , NH
4
, Al 3+ , Zn 2+ , Cu 2+ ,
Co 2+ , Ni 2+ , Mn 2+
100 mg/L J –
50 mg/L SiO
2
40 mg/L Hg 2+
25 mg/L Sn 2+
20 mg/L Pb 2+
10 mg/L Ag + , Cr 3+
1 /mg/L Cr 6+