The core function of brown reagent bottles is to store chemical reagents that are sensitive to light away from light, preventing them from decomposing, evaporating, or deteriorating due to light exposure. Brown glass can effectively absorb most visible light (especially ultraviolet light), significantly reducing the exposure of light to reagents and thus reducing the risk of photochemical reactions. At the same time, it retains a small amount of transparency, making it easy to observe the status of the reagent (such as remaining amount or whether it has deteriorated), while black bottles have stronger light blocking properties but obstruct the line of sight, which is not conducive to experimental operations.
Brown reagent bottles are mainly used to store chemical reagents that are easily decomposed or deteriorated under light, such as nitric acid, silver nitrate, chlorine water, etc. They can also be used to store solid reagents that need to be stored away from light, such as nitrates. It can effectively block the irradiation of ultraviolet and visible light, protect the stability of reagents, ensure the accuracy of chemical analysis and experimental results, and its color is also convenient for laboratory personnel to quickly distinguish different types of reagents, avoiding misuse.
According to the shape of the bottle mouth, it can be divided into wide mouthed bottles and narrow mouthed bottles. The wide mouthed bottle has a larger mouth, making it easy to access solid reagents; Thin mouthed bottles have a smaller mouth and are suitable for storing liquid reagents, which can reduce the risk of liquid evaporation and contamination.
Coloring principle
The coloring principle of brown glass is based on selective absorption of high-energy bands in visible light (400-500nm blue to purple). It has a transmittance of less than 5% for light with wavelengths below 450nm, while the transmittance of red light (620-750nm) can reach over 80%, effectively blocking ultraviolet and blue light that cause the decomposition of photosensitive substances, while retaining necessary light for observing liquid levels.
Precautions for use
The light blocking property of brown reagent bottles will decrease over time. It is recommended to check and replace them every 2-3 years, or replace them in a timely manner according to the product expiration date.
For photosensitive reagents, aluminum foil can be wrapped around the outer layer to enhance the shading effect.
safe operation
When opening the bottle stopper, avoid direct contact with the inner wall by hand (which may contaminate the reagent). It is recommended to use clean tools or wear gloves.
When pouring liquid, the bottle mouth should be tightly attached to the container mouth and poured slowly to reduce the risk of volatilization and splashing.
Waste reagents must be disposed of according to the hazardous waste disposal process and cannot be dumped at will.