Well,

at Hazcat - we do not manufacture the strips and have relied on different manufacturers over many years - so we have some experience with the various brands-

After dealing with all the brands for years and years now - we came up with a procedure to limit their use because:

• Short shelf life
• Expensive
• Interferences

W still use them - but have developed a procedure that uses reagents without a shelf life. One of the important interferences to their use is ammonia=E2=80=A6 You may be familiar with Pirahna Base solutions (3 parts ammonia/1 part hydrogen peroxide) - even though this solution contains 30% hydrogen peroxide at 25% volume - the ammonia interferes with the paper's ability to see the peroxide.

So, check it out

Here is a link to the test procedure we use to limit the reliance on test papers and remove the interferences.

https://www.dropbox.com/t/je9ywyr5Q8Yjhh8X

If you have questions give me a call

Dan Keenan

925-878-7110

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