7625 CAS Dropper Pipet
- Sufficient for 50 tests at 20 ppm
- 1 drop = 1.25 ppm HEDP
- 1 drop = 1.4 ppm PBTC
Chromazurol S method may be used for Dequest, Bayhibit, Belcor 575 and Belsperse 161 phosphonates. Indicator changes from yellow to pink at the pH ideal for the reaction, then thorium nitrate is added until the solution turns purple.