|
Sodium tripolyphosphate (STPP)
| |
Requested parameters |
Measured |
| P2O5 v % |
min.57.00 |
57.90 |
| Insolubilities - % |
max.0.10 |
0.06 |
| As |
max.3.0 |
0.50 |
| Pb - ppm |
max.5.0 |
0.20 |
| F |
max.10 |
2.0 |
| 1% solution of PH |
9.5 .. 10.2 |
9.8 |
| Moisture- % |
max.0.70 |
0.2 |
| Cd |
max.1.0 |
0.10 |
| Hg - ppm |
max.1.0 |
0.10 |
| Heavy metals |
max.10.0 |
<10.0 |
| tripolyphosphate |
min.95.0 |
96.50 |
Tetrasodium pyrophosphate (TSPP)
| |
Requested parameters |
Measured |
| P2O5 v % |
min.52.5 |
53.65 |
| Sodium pyrophosphate - % |
min.95.00 |
95.38 |
| 1% solution of PH |
9.8 .. 10.8 |
10.2 |
| Insolubilities - % |
max.0.2 |
0.10 |
| Ignition loss by 550 C - % |
max.0.5 |
0.4 |
| Fluoride |
max.10 |
4.0 |
| Plumbum - ppm |
max.4.0 |
0.20 |
| Cadmium |
max.1.0 |
0.10 |
| Hg - ppm |
max.1.0 |
0.10 |
| As |
max.3 |
0.50 |
 |
