Tungsten and Silicone Content of Prefillable Syringes
| Sample | ng tungsten/syringe | μg silicone/syringe | |
|---|---|---|---|
| 5% NH4OH | 2% HNO3 | ||
| CZ 1 mL IN Long | 0 | 0 | 0 |
| Glass 1 mL Long | 117 | 48 | 203.5 |
Tungsten and silicone oil were extracted and quantitated as described under Methods and Materials. Values shown are the mean of two (glass) or four separate experiments (CZ) in which four syringes extracted with either 5% NH4OH or 2% HNO3 to solubilize tungsten oxidation products or with methyl isobutyl ketone to solubilize silicone oil. The values obtained for the CZ syringes were identical to the solvent blank.