Solid content determination method

Solid content refers to the percentage or mass fraction of solid substances contained in a liquid. It is an indicator that describes the concentration or content of solid substances in a liquid. Solid content is often used to describe the content of solid substances in various liquid systems such as solutions, suspensions, emulsions, and colloids.

The formula for calculating the solid content is:

Solid content (%) = (solid mass/total mass) × 100

Among them, solid mass refers to the mass of solid substances contained in the liquid, and total mass refers to the total mass in the liquid (including the mass of solid substances and solvents or media).

The determination method of solid content varies according to the properties of the liquid and the characteristics of the solid substance. Common solid content determination methods include weighing method, drying method, filtration method, centrifugation method, etc. The specific determination method should be selected according to the liquid system and experimental requirements. The determination of solid content is of great significance for the production and quality control of liquid systems. In various industrial fields, such as chemical industry, food, pharmaceutical, textile, etc., the determination of solid content is often used to monitor and adjust the composition and properties of products to ensure product quality and production effect.

Drying method: The liquid sample to be tested is placed in a pre-weighed container, and the solvent in the liquid is evaporated or volatilized by heating or vacuum drying, leaving the solid substance. Then weigh the mass of the solid substance and calculate the solid content.

Centrifugation method: The suspended particles or precipitates in the liquid are separated by centrifugation, and then the separated solid material is dried and weighed. Solid content is calculated based on the mass of the solid material and the total mass of the liquid sample.

Filtration method: Filtration of liquid samples using filter paper or microporous membranes traps solid particles or precipitates on the filter medium. The filter medium and solid material are then dried together and weighed. Solid content is calculated by comparing the mass of the solid material with the total mass of the liquid sample.

Post-dissolution determination method: The liquid sample to be tested is completely dissolved, and the concentration or content of the solid substance in the solution is determined by appropriate analytical methods (such as spectroscopy, colorimetry, specific gravity, etc.). The solid content is then calculated based on the concentration of the solid substance and the total volume or mass of the liquid sample.

Basic operation steps:

DRYING METHOD: 

A. Prepare to weigh the container and record the quality of the container. 

B. Transfer the liquid sample to be tested into the container.

C. Using heating equipment or a vacuum dryer, evaporate or evaporate the solvent in the liquid sample, leaving the solid material behind.

D. Put the container and the solid matter together in a dryer and let it dry completely. e. Weigh the mass of the dried container and the solid matter and record the mass value.

F. Calculate the solids content based on the mass of the solid substance and the total mass of the liquid sample.

CENTRIFUGATION METHOD:

A. Prepare the centrifuge tube or centrifuge and record its quality.

B. Pour the liquid sample to be tested into the centrifuge tube.

C. Use a centrifuge to centrifuge the liquid sample to separate solid particles or precipitates.

D. Transfer the centrifuged solid material to a dry container.

E. Place the container in a dryer with the solid material and allow it to dry completely.

F. Weigh the mass of the dried container and solid matter and record the mass value. g. Calculate the solid content based on the mass of the solid matter and the total mass of the liquid sample.

FILTERING METHOD:

A. Prepare the filter device, including filter paper or microporous membrane, filter funnel, etc.

B. Pour the liquid sample to be tested into the filter funnel and filter the liquid through filter paper or microporous membrane.

C. Leave solid particles or precipitates on filter paper or microporous membrane.

D. Transfer filter paper or microporous membranes and solid matter to a dry container.

E. Put the container and solid matter together in a dryer and let it dry completely. f. Weigh the mass of the dried container and solid matter and record the mass value.

G. Calculate the solids content based on the mass of the solid substance and the total mass of the liquid sample.

POST-DISSOLUTION ASSAY: 

A. Prepare an appropriate solvent and completely dissolve the liquid sample to be tested.

B. Select appropriate analytical methods according to the measurement requirements, such as spectroscopy, colorimetric method, specific gravity method, etc., to determine the concentration or content of solid substances in the solution.

C. Record the measurement results, including the concentration of solid substances and the total volume or mass of the liquid sample.

D. Calculate solid content based on concentration and total volume or mass.

The above are the basic operation steps. The specific operation should select appropriate instruments and reagents according to the experimental requirements and methods, and operate in accordance with the relevant operating procedures and standards. The determination method of solid content should be selected according to the specific sample characteristics and measurement requirements. Different methods are suitable for different types of solid substances and liquid samples. When performing solid content measurement, corresponding operating procedures and standards should be followed to ensure the accuracy and repeatability of measurement results.