[China Glass Net] Elemental Analyzer Laboratory Glassware Washing
Analytical chemistry laboratories often use glass containers and porcelain. When experimenting with unclean containers, accurate results are often not obtained due to the presence of dirt and impurities. So the container should be kept clean.
There are many ways to wash the container, and should be selected according to the requirements of the experiment, the nature of the dirt and the degree of contamination.
Generally, the dirt attached to the instrument is dust and other insoluble substances, soluble substances, organic substances and oil stains. For these situations, the following methods can be used:
1 Wash with water: Wash the dust and water-soluble substances attached to the container with tap water and a brush.
2 Use a decontamination powder (or detergent) and a brush to scrub the oil and organic matter attached to the container. If it is still not clean, wash it with hot alkaline solution. The volumetric instrument cannot be brushed with a decontamination powder and a brush to prevent the wall from being worn and the volume to be changed.
3 Wash off the oxidant such as manganese dioxide with a reducing agent.
4 When performing quantitative analysis experiments, even a small amount of impurities will affect the accuracy of the experiment. At this time, the volumetric instrument can be cleaned with a lotion. The wash solution is a saturated solution of potassium dichromate in concentrated sulfuric acid. (5 g of crude potassium chromate dissolved in 10 mL of hot water, slightly cold, slowly added to 100 mL of concentrated sulfuric acid with stirring to obtain a chromic acid washing solution, referred to as washing liquid).
Pay attention to the following points when using lotion:
1 It is better to wash the container with water or detergent before using the lotion.
2 Try to remove the water from the container before using the lotion to avoid diluting the lotion.
3 After washing, it should be poured into the original bottle and can be reused.
4 Do not use washing liquid to wash the reducing dirt (such as some organic matter), which can reduce the potassium dichromate in the washing liquid to chromium sulfate (the color of the washing liquid changes from the original dark brown to green) ). The lotion that has turned green cannot be used any more.
5 lotion is very corrosive and can burn skin and damage clothing. If you accidentally spill the lotion on your skin, clothing, and lab table, rinse immediately with water.
6 Because the potassium dichromate is seriously polluting the environment, the washing liquid should be used as little as possible. The container washed by the above method is also washed with water to remove the detergent. It was washed three times with distilled water.
The principle of a small amount (a small amount of detergent each time) should be met when washing the container. It saves both efficiency and efficiency. Insoluble or oily soil should not be attached to the wall of the cleaned container. Such walls can be completely wetted by water. When checking whether it is washed, turn the container upside down, and the water will flow down the wall, leaving only a thin and uniform water film on the wall, instead of water droplets.
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