P17.2
Active Matter Determination for Nonionic Surfactants — Cobalt Thiocyanate Complexation Method
Procedure 2 of 40 · Chapter 17 · §17.1.3
1 table 0 notes
Table 1
| Reagent | Preparation |
|---|---|
| Ammonium cobaltothiocyanate reagent | Dissolve 30.0 ± 0.1 g Co(NO₃)₂·6H₂O and 200.0 ± 0.1 g NH₄SCN in water, dilute to 1000 mL. Stable for 1 month at 25°C . |
| Dichloromethane (DCM) | HPLC or analytical grade |
| Nonionic surfactant standard | Known purity (e.g., nonylphenol ethoxylate, NP-8 or NP-10, >98%) |
| Sodium chloride saturated solution | Dissolve 360 g NaCl in 1 L water |