Examinations were made on the absorption spectrophotometric determination of I
- and NO
2- using 3, 4, 5, 6-tetrachloro-3', 4', 5', 6'-tetrahydroxyfluoran methyl ester (Cl-gall-CH
3). For the determination of I
-, calibration curve of 0.1 -0.6 μg/10 ml of I
- was prepared with 1.0 ml of 1.0×10
-2 cetylpyridinium chloride, 1.0 ml of 20% H
2O
2 solution, and 1.0 ml of 1.0×10
-3M Cl-gall-CH
3 solution, in sulfuric acidity, brought to 10 ml with water and the same solution added with definite amount of I
- by measuring their optical density at 510 mμ. For the determination of NO
2-, the calibration curve was prepared with 0-18.4 μg/10 ml of NO
2- with 1.0 ml of 1.0% poly vinyl alcohol and 1.0 ml of 1.0×10
-3M Cl-gall-CH
3 solution brought to 10 ml with water and heated at 60° for 10 min and the same solution added with definite amount of NO
2- by measuring their optical density at 490 mμ. Determination of NO
2- was little interfered by other ions but any ion present gave negative error in the determination of I
-.
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