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Para nitro phenol (PNP) working standard solution (30 µg/ml): Weigh accurately 0.03 g of PNP and carefully transfer it into a clean 100 ml standard volumetric flask, dissolve it in some amount of distilled water. Then, make up the volume upto 100 ml using distilled water. This solution contains 300 µg/ml PNP (stock solution - 10X). From this stock solution, pipette out 10 ml into a clean 100 ml standard volumetric flask and make upto the mark using distilled water. This solution contains 30 µg/ml PNP (working standard solution). Prepare PNP calibration curve of concentration range 0 - 30 µg and volume range 0 - 1 ml. Determination of PNP Calibration Curve Tube PNP (ml) water (ml) Concentration of PNP (µg) Volume of 0.1 N NaOH (ml) O.D at 405 nm 01. 0.0 1.0 0 2 02. 0.2 0.8 6 2 03. 0.4 0.6 12 2 04. 0.6 0.4 18 2 05. 0.8 0.2 24 2 06. 1.0 0.0 30 2 |
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