Figure 4: Comparison of 2 μL injections of the 200 ppb organochlorine mixture at 55°C (held 0.3 min, then ramped to 325°C at 600°C/min) with the oven temperature program starting at 45°C [top] with the original oven temperature program and splitless 210°C injector (bottom), both on the T-union chromatographic column. Same peak labels as in Figure 1. Note that peak retention times in the top TIC trace have increased by 2 min uniformly.