What are some common interferences for the arsenic test kits?

Document ID

Document ID TE3356

Published Date

Published Date 25/01/2018
Question
What are some common interferences for the arsenic test kits?
Summary
Common interferences for the arsenic test kits
Answer
Common  interferences for both the Arsenic Low Range Test Kit (catalog number 2800000) and EZ Arsenic High Range Test Kit (catalog number 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.