Summary of detection performance of precipitated barium sulfate and its detection method

Precipitated barium sulfate is a white powder inorganic compound, chemical formula is BaSO4, commonly used for preparation of barium salt, chemical reagents, paint, rubber, plastics and other fields.

Detection performance
It has the characteristics of high density, heat resistance, acid and alkali corrosion resistance, etc. In the application, the following properties need to be tested:

Particle size distribution: the distribution of powder particle size directly affects its performance and use effect.

Particle shape: The shape of the particle has an important impact on the fluidity, dispersion and stability of the coating.

Specific surface area: It affects the chemical reaction rate, surface energy, wettability, adhesion and other properties of the powder.

Sedimentation volume: reflects the density and sedimentation velocity of precipitated barium sulfate, which can indirectly reflect its particle size.

Summary of detection performance of precipitated barium sulfate and its detection method

Volatile matter content: test its moisture content, impurity content, etc.

Acid soluble substance content: test its acid soluble substance content, which has an impact on the use scenario and quality requirements.

The above properties can be detected and analyzed by particle size meter, specific surface area meter, sedimentation volume meter, oven, acidity meter and other instruments and equipment.

Index of detection
Precipitated barium sulfate is usually used as a white pigment or filler, and its performance testing needs to pay attention to the following aspects:

PerformanceIndex of detection
Chemical purityBaSO4 content
Physical propertiesParticle size distribution, specific surface area, oil absorption value
Optical propertiesPowder brightness, hiding power, color difference

Summary of detection performance of precipitated barium sulfate and its detection method

Detection method
The specific detection method is as follows:

Chemical purity: By gravimetric method, the sample was added to barium nitrate to generate a precipitate, and then dried and weighed in an electric furnace to calculate the mass fraction of BaSO4 in the precipitate.

Physical Properties:

Particle size distribution: laser particle size meter, electron microscope and other equipment were used to determine the particle size distribution of precipitated barium sulfate.

Specific surface area: The specific surface area of precipitated barium sulfate was determined by gas adsorption method (such as BET method).

Oil absorption value: According to ISO standard or national standard, the oil absorption value of precipitated barium sulfate was determined by cetyltrimethyl ammonium bromide solution immersion method.

Summary of detection performance of precipitated barium sulfate and its detection method

Optical properties:

Powder brightness: Use reflective spectrometer and other instruments to measure the reflectance of precipitated barium sulfate and calculate the powder brightness.

Hiding power: The hiding power was evaluated by comparing the transmittance or transmissionability of the sample coated with precipitated barium sulfate with the standard sample.

Color difference: The color parameters of precipitated barium sulfate, such as L*, a*, and b* values, are measured using devices such as a colorimeter or colorimeter.

How to detect
Appearance detection: Observe the shape, size, color and other characteristics of the sample by visual inspection or microscope.

Particle size distribution: The average diameter, particle size distribution and other parameters of the particles in the sample are measured by particle size analyzer or microscope and other test instruments.

Summary of detection performance of precipitated barium sulfate and its detection method

Purity test: Use chemical analysis methods or instruments to analyze the main components and impurities in the sample to determine the purity of the sample.

Specific surface area measurement: The specific surface area of the sample is measured by the specific surface area meter and other test instruments to evaluate the activity and reaction performance of the sample.

Solubility determination: The chemical properties of a sample are evaluated by observing its solubility at different temperatures.

Colorimetry: Use photometers and other instruments to determine the absorbance of the sample, so as to determine the chromaticity of the sample.

Densitometry: The density of a sample is measured by a test instrument such as a densitometer to evaluate its physical properties.

Chemical stability determination: Chemical analysis methods or instruments are used to determine the chemical stability of the sample, so as to determine its stability under different conditions.

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