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Molybdenum, Molybdate, HR,
Interferences
Interference studies were conducted by preparing a molybdenum standard solution
6+
(2 mg/L Mo
) as well as a solution of the potential interfering ion. When the
standard solution concentration changed by ± 5% with a given ion concentration,
the ion was considered an interference.
Large interferences are caused by some biocides common to cooling water tower
samples. Hach recommends testing the procedure on molybdenum standards in the
presence of the specific biocides in use to determine the feasibility of the ternary
complex chemistry.
.
Ion
Acrylates
Alum
Aluminum
continued
Negative Interference:
Interferes at
(mg/L):
790
Diethanoldithiocarba-mate
7
EDTA
2
Ethylene Glycol
1—46
Interferes at
Ion
(mg/L):
32
1500
2%
(by volume)
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