GB/T 8704.9-2009Ferrovanadium - Determination of manganese content - The potassium periodate oxidation photometric method and flame atomic absorption spectrometric method (English PDF)

3.1 Principle

Samples with sulfuric acid - phosphoric acid dissolved in potassium periodate oxidation of manganese to permanganate, 525nm wavelength measured absorbance on a spectrophotometer degree. Quality on the calibration curve Richard manganese content in the sample is calculated in manganese.

3.2 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or its equivalent purity water.

3.2.1 High potassium iodate, solid.

3.2.2 Phosphoric acid, rho1.70g/mL.

3.2.3 Nitrate, rho1.42g/mL.

3.2.4 Hydrofluoric acid, rho1.15g/mL.

3.2.5 Sulfate, 1 + 4.

3.2.6 EDTA (edetate disodium dihydrate) was added, 100g/L. Weigh 100g of disodium ethylenediamine tetraacetate dihydrate 200mL water (C10H14N2O8Na2 · 2H2O) was dissolved in 5mL containing ammonium hydroxide (rho0.90g/mL), and diluted with water 1000mL.

3.2.7 does not contain water reducing substance. in 1000mL of water were added 20mL sulfuric acid (1 + 1), adding a small amount under the micro-boiling state (About 2g) potassium periodate (3.2.1), and held for about 10min. Cooled, stored in a glass bottle and set aside.

3.2.8 Manganese standard solution. Weigh 0.1000g Jinzhumeng [mass fraction is greater than 99.9%, pre-washed to remove table in sulfuric acid (5 + 95) Oxide surfaces, removed, washed with water immediately clean and washed 2 or 3 times with ethanol, and air-dried to use] 300mL beaker was placed Was added 20mL of hydrochloric acid (1 + 1), 20mL sulfuric acid (1 + 1), dissolved by heating, and evaporated to take the drive out white smoke of sulfuric acid, hydrochloric acid, cooled to room temperature. Moved into 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL manganese 100µg.

3.3 Instrument

Analysis using common laboratory instruments.