Method 4 Standard 1

Calibration Curve Set, Native Compounds (§ 5.9) Set of 7 solutions in isooctane/toluene; unit: 7x1mL Compound Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Solution 6 Solution 7 ng/mL ng/mL

Labelled Compound Stock Solution, 1.2ml, nonane

2,4-D 13C6, 100µg/ml in Acetone, 1ml