{"id":3956,"date":"2025-09-18T09:09:54","date_gmt":"2025-09-18T01:09:54","guid":{"rendered":"https:\/\/www.pgeneral.com\/?p=3956"},"modified":"2025-09-18T09:09:54","modified_gmt":"2025-09-18T01:09:54","slug":"determination-of-sodium-oxide-in-aluminum-oxide-powder-flame-atomic-absorption-spectrometry","status":"publish","type":"post","link":"https:\/\/www.pgeneral.com\/it\/applications\/determination-of-sodium-oxide-in-aluminum-oxide-powder-flame-atomic-absorption-spectrometry\/","title":{"rendered":"Determinazione dell'ossido di sodio in polvere di ossido di alluminio (spettrometria di assorbimento atomico di fiamma)"},"content":{"rendered":"

1. Method Overview<\/h2>\n
The sample is dissolved by heating in a quartz beaker using a mixed acid of sulfuric acid and phosphoric acid. An air-acetylene flame is employed, and the absorbance of sodium oxide is measured at a wavelength of 589.0 nm using an atomic absorption spectrometer. Within a certain concentration range, the absorbance of sodium is proportional to its content, and quantitative determination is performed by comparison with a standard series.<\/div>\n
\n

2. Instruments and Reagents<\/h2>\n

2.1 Instruments and Equipment<\/h3>\n

2.1.1 Testing Instruments<\/h4>\n
\n
\n\n\n\n\n\n\n\n
Serial No.<\/th>\nName<\/th>\nQuantity<\/th>\nTechnical Requirements<\/th>\nAccessories<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nAtomic Absorption Spectrophotometer (TAS-990)<\/td>\n1 set<\/td>\n–<\/td>\nSodium Hollow Cathode Lamp<\/td>\n<\/tr>\n
2<\/td>\nAir Compressor<\/td>\n1 set<\/td>\nRated discharge pressure: 0.3 MPa<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nAcetylene Gas<\/td>\n1 cylinder<\/td>\nPurity \u2265 99.99%<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.1.2 Sample Pretreatment Equipment<\/h4>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Serial No.<\/th>\nName<\/th>\nQuantity<\/th>\nTechnical Requirements<\/th>\nAccessories<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nQuartz Beaker<\/td>\n6 pieces<\/td>\n50 mL<\/td>\n6 watch glasses<\/td>\n<\/tr>\n
2<\/td>\nGlass Stirring Rod<\/td>\n1 piece<\/td>\n20 cm<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nElectric Stove<\/td>\n1 set<\/td>\nTemperature-adjustable<\/td>\n–<\/td>\n<\/tr>\n
4<\/td>\nStandard Sieve<\/td>\n1 piece<\/td>\n0.125 mm<\/td>\n–<\/td>\n<\/tr>\n
5<\/td>\nAdjustable Hot Plate<\/td>\n1 set<\/td>\nRated temperature: Room temperature ~ 300\u2103<\/td>\n–<\/td>\n<\/tr>\n
6<\/td>\nOven<\/td>\n1 set<\/td>\nRated temperature: Room temperature ~ 200\u2103<\/td>\n–<\/td>\n<\/tr>\n
7<\/td>\nMicropipette<\/td>\n1 each<\/td>\n100 \u03bcL ~ 1000 \u03bcL; 1000 \u03bcL ~ 5000 \u03bcL<\/td>\n–<\/td>\n<\/tr>\n
8<\/td>\nVolumetric Flask<\/td>\nSeveral<\/td>\n100 mL<\/td>\n–<\/td>\n<\/tr>\n
9<\/td>\nVolumetric Flask<\/td>\n1 piece<\/td>\n500 mL<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.2 Reagents<\/h3>\n

2.2.1 Reagents<\/h4>\n
\n
\n\n\n\n\n\n\n\n\n
Serial No.<\/th>\nName<\/th>\nTechnical Requirements<\/th>\nRemarks<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nSulfuric Acid<\/td>\nGuaranteed Reagent (GR)<\/td>\n–<\/td>\n<\/tr>\n
2<\/td>\nPhosphoric Acid<\/td>\nGuaranteed Reagent (GR)<\/td>\n–<\/td>\n<\/tr>\n
3<\/td>\nAluminum Powder<\/td>\nGuaranteed Reagent (GR)<\/td>\n–<\/td>\n<\/tr>\n
4<\/td>\nCesium Chloride<\/td>\nGuaranteed Reagent (GR)<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.2.2 Prepared Reagents<\/h4>\n
\n
\n\n\n\n\n\n\n
Serial No.<\/th>\nName<\/th>\nPreparation Method<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nAluminum Matrix Solution<\/td>\nAccurately weigh 3.306 g of aluminum powder into a 50 mL quartz beaker. Add 125 mL of phosphoric acid and 25 mL of sulfuric acid, cover with a watch glass, and heat the beaker on an electric stove while shaking to dissolve the sample. After complete dissolution, immediately remove the beaker and cool it to 40\u2103 ~ 70\u2103. Rinse the watch glass with hot water (50\u2103), and transfer the rinsing solution into the original beaker. Wash the solution into a 500 mL volumetric flask using hot water (50\u2103), dilute with pure water to approximately 400 mL, shake evenly, cool to room temperature, then dilute to the marked volume with pure water, mix well, and store in a polyethylene bottle. This solution contains 12.5 mg of aluminum oxide per 1 mL.<\/td>\n<\/tr>\n
2<\/td>\nNitric Acid Solution (1+99)<\/td>\nMeasure 10 mL of nitric acid, pour it into 990 mL of pure water, and shake well.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

2.3 Reference Standards<\/h3>\n

2.3.1 Stock Solution<\/h4>\n
\n
\n\n\n\n\n\n
Serial No.<\/th>\nNo.<\/th>\nName<\/th>\nTechnical Requirements<\/th>\nRemarks<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nGSBG62004-90-(1101)<\/td>\nSodium Single-Element Standard Solution<\/td>\n1000 \u03bcg\/mL<\/td>\nCentral Iron and Steel Research Institute<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

3. Operational Procedures<\/h2>\n

3.1 Sample Handling<\/h3>\n

3.1.1 Preparation of Test Solution<\/h4>\n
    \n
  1. \n
    Sample Pretreatment<\/strong>:
    Pass the sample through a 0.125 mm standard sieve, dry it in an oven at 300\u2103 \u00b1 10\u2103 for 2 hours, and cool to room temperature.<\/div>\n<\/li>\n
  2. \n
    Sample Digestion<\/strong>:
    Weigh 0.25 g (accurate to 0.0001 g) of the sample into a 50 mL quartz beaker. Add 25 mL of phosphoric acid and 5 mL of sulfuric acid, cover with a watch glass, place on an electric stove, and heat while shaking to dissolve the sample. After complete dissolution, immediately remove the beaker and cool it to 40\u2103 ~ 70\u2103. Rinse the watch glass with hot water (50\u2103), and transfer the rinsing solution into the original beaker. Wash the sample solution into a 100 mL volumetric flask using hot water (50\u2103), dilute with pure water to approximately 80 mL, shake evenly, cool to room temperature, then dilute to the marked volume with pure water, mix well, and set aside for testing. Weigh 0.1323 g of aluminum powder and perform a blank test alongside the sample.<\/div>\n<\/li>\n<\/ol>\n

    3.1.2 Preparation of Standard Solutions<\/h4>\n
      \n
    1. \n
      Preparation of Sodium Standard Intermediate Solution (100 \u03bcg\/mL)<\/strong>:
      Accurately pipette 5 mL of the sodium standard solution (1000 \u03bcg\/mL) into a 50 mL volumetric flask, and dilute to the marked volume with nitric acid solution (1+99), shake well.<\/div>\n<\/li>\n
    2. \n
      Preparation of Sodium Standard Series<\/strong>:
      Accurately pipette 0.0 mL, 0.4 mL, 0.8 mL, 1.2 mL, 1.6 mL, and 2.0 mL of the sodium standard intermediate solution (100 \u03bcg\/mL) respectively into a set of 100 mL volumetric flasks that have been pre-added with 8 mL of aluminum matrix solution. Dilute to the marked volume with pure water, mix well, and store in polyethylene bottles. The concentrations of this sodium standard series are 0.0 \u03bcg\/mL, 0.4 \u03bcg\/mL, 0.8 \u03bcg\/mL, 1.2 \u03bcg\/mL, 1.6 \u03bcg\/mL, and 2.0 \u03bcg\/mL.<\/div>\n<\/li>\n<\/ol>\n

      3.2 Sample Testing<\/h3>\n
        \n
      1. Testing Conditions<\/strong>
        Reference Conditions for Flame Atomic Absorption Spectrophotometer Detection<\/li>\n<\/ol>\n


        <\/p>\n

        \n
        \n\n\n\n\n\n\n\n\n\n\n
        Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
        Wavelength (nm)<\/td>\n589.0<\/td>\n<\/tr>\n
        Spectral Bandwidth (nm)<\/td>\n0.4<\/td>\n<\/tr>\n
        Element Lamp Current (mA)<\/td>\n2.0<\/td>\n<\/tr>\n
        Fuel Gas Flow Rate (mL\/min)<\/td>\n1300<\/td>\n<\/tr>\n
        Burner Height (mm)<\/td>\n5.0<\/td>\n<\/tr>\n
        Air Compressor Pressure<\/td>\n0.22 MPa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n


        <\/p>\n

          \n
        1. Sample Testing<\/strong>:
          Use an air-acetylene flame. At a wavelength of 589.0 nm on the atomic absorption spectrometer, zero the instrument with water, measure the absorbance, subtract the absorbance of the “zero-concentration” solution in the standard series, and draw a working curve.<\/li>\n<\/ol>\n<\/div>\n