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 then neutralizing the solution before using the test strip.

Remember that the Phosphate test strip gives ppm as Phosphate, not phosphate ion. The result should be corrected for any dilutions/additions and multiplied by 3 to arrive at the phosphate ion ppm.