What are some common interferences for the arsenic test kits?

Dokument-ID

Dokument-ID TE3356

Veröffentlichungsdatum

Veröffentlichungsdatum 24.01.2019
Frage
What are some common interferences for the arsenic test kits?
Zusammenfassung
Common interferences for the arsenic test kits
Antwort
Common  interferences for both the Arsenic Low Range Test Kit  (Product # 2800000) and EZ Arsenic High Range Test Kit  (Product # 2822800) include sulfide, selenium, antimony, tellurium and other metal hydrides.

For the Arsenic Low Range Test kit, one can account for sulfide interference by swirling and shaking the sample after the second powder pillow addition and waiting until the rotten egg smell is gone.

For the EZ Arsenic High Range Test Kit, there is a procedure that uses cotton soaked in lead acetate to remove sulfide. This is described in the user manual. The EZ Arsenic High Range Test Kit can handle a higher level of sulfide interference than the Arsenic Low Range Test Kit.

Sulfide can still interfere in both test kits even with the above steps if the concentrations are extremely high.

The manual for the EZ Arsenic High Range Test Kit also lists pH values below 5 and nitric acid as interferences.

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