No. The Phosphate test strip uses the Molybdenum Blue method and detects only orthophosphates. Tripolyphosphates must be converted to orthophosphate first to be detected. This can be accomplished by treating the sample with acid first, and [...]
The pad for reading the results is the one at the bottom of the channel or well. When laid on a table with the “bump” facing up, it is the pad you can see. This [...]
There are some interferences to consider: Arsenate and silicates above 20 ppm will cause a false reaction. These will form a yellow color. Fluoride, chlorides, and nitrites above 50 ppm will depress the phosphate reaction [...]
The Phosphate test strip is measuring phosphate (as phosphorous) in ppm. We do not offer a strip that can read as low as ppb.