Microdetermination of endrin in presence of aldrin and dieldrin by infrared spectroscopy

An infrared spectrophotometric micromethod, specific for endrin, has been developed which quantitatively measures 1–2 μg of endrin in solutions containing endrin-dieldrin-aldrin. Endrin was determined by: a) reference to a standard curve based on the 748 cm −1 (13.37 μ) absorbance band unique to endrin, or b) use of a constant based on the ratio of the 748 cm −1 absorbance band of endrin to the 1179 cm −1 (8.48 μ) absorbance band common to all three compounds. Sensitivity and accuracy were attained with micro cells. The measurements were made with controlled slit width and instrument conditions. The base-line technique was used to measure the intensities.