CCl4 Scale
| Updated: January, 2008 | ||||||
| Seven standards now comprise the GML CCl4 scale. Four standards prepared in 1996 were | ||||||
| removed from the scale due to inconsistent performance. | ||||||
| The 2008 scale is 0.4% lower than the 1996 scale based on ECD results. | ||||||
| Standard | Prepared | Assigned | Difference | |||
| (ppt) | (ppt) | (ppt) | ||||
| SX-3519 | 49.8 | 49.02 | -0.76 | |||
| SX-3518 | 25.4 | 26.18 | 0.78 | |||
| SX-3522 | 41.5 | 41.21 | -0.29 | |||
| SX-3506 | 94.3 | 94.91 | 0.64 | |||
| SX-3505 | 47.3 | 46.97 | -0.30 | |||
| ALM-33800 | 127.71 | 127.93 | 0.22 | |||
| ALM-65990 | 153.09 | 152.80 | -0.29 | |||
| std dev | 0.57 | |||||
