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Those things about trace analysis labware cleaning---Nanjing binglab

Views: 0     Author: Site Editor     Publish Time: 2023-08-05      Origin: Site

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Those things about trace analysis labware cleaning---Nanjing binglab

PFA Square Groove 300x210x240mm Teflon Cassette Cleaning Tank With PTFE Cover

Trace analysis labwares

Pre-treatment cleaning of the vessels is a crucial step in trace element analysis.

Ⅰ. The Importance of Laboratory Ware Cleaning:

1. In the analytical work, the cleaning of experimental vessels is a must do before the experimental preparatory work, the cleanliness of the vessels, the accuracy and precision of the experimental work have an impact;

2. Sources of contamination include the materials of the utensils and tools used, the reagents and the laboratory air environment. Contaminants may be leached from the vessels or tools or desorbed from their surfaces into the sample solution.

Ⅱ. Methods of cleaning Teflon utensils:

Method one (general cleaning method)
1. Carefully rinse the inner and outer walls of the vessel with pure water to remove surface impurities.
2. Soak in a weak alkaline detergent and heat to 100°C to remove organic residues.
3. Leave to cool after cleaning and then wash carefully with pure water.

Method two (ultra-pure laboratory ware cleaning)
1. First wipe off the floating dust on the vessels with a dust-free cloth and rinse the inner and outer walls of the vessels with tap water repeatedly.
2. Place an appropriate amount of tap water and surfactant in a clean plastic basin, stir well and put into the vessel, after full immersion and cleaning, rinse the surfactant with tap water and then rinse the vessel repeatedly with pure water.
3. Put into a clean PFA tank, add aqua regia and place the electric heating plate to heat 120°C for 24 hours.
4. Rinse the inner and outer walls of the vessel again with purified water 3-4 times, add 1:1HNO3 and cook at 120°C for 24 hours.
5. Repeat step 4.
6. Rinse the inner and outer walls of the vessel 3-4 times with purified water, add deionised water MQH2O and cook at 120°C for 12 hours.
7. Finally, rinse the inner and outer walls of the vessel 3-4 times with deionised water and place on an ultra-clean table to air dry.

Ⅲ. Ware washing precautions:

1. laboratory ware cleaning is to be sure not to use brushes or abrasives and other things that can easily damage the ware, even if it is a small loss of mouth can cause operational contact deformation, as well as the residue of trace elements, etc.

2. Avoid placing it in direct sunlight or in places with a high impact on air-conditioning equipment. Pay attention to the change of air when cleaning.

Here are a few good and affordable utensil cleaning combinations.

PFA cleaning tank + electric heating plate

PFA cleaning tank: L300mm* W210mm* H240mm

PFA Cleaning Tank

PFA cleaning tank, also known as corrosion protection tank, pickling tank, overflow tank, pure water tank, immersion tank, etc. Its one-piece construction, resistant to strong acids and alkalis, low background values, no leaching and precipitation, maximum temperature resistance 260°C.

Can be used with our split type anti-corrosion electric heating plate (control box can be placed outside the fume hood to reduce the corrosion of parts by acid gas and prolong the service life) for soaking and boiling experimental vessels.

Vials cleaning barrel

PFA cleaning barrel designed for cleaning sample residues from laboratory vials and small utensils.

The cleaning barrel is used together with a cleaning stand, the grid design fixes the parts in the right position for batch cleaning of various laboratory vessels with soap or inorganic acids.

The lid of the washing tank is equipped with a bleed valve to avoid high pressure inside the tank when heating. The system can be kept in a sub-boiling state for several days of continuous heating without causing acid evaporation.

Lower background value compared to conventional glass beakers, corrosion resistant, drop resistant and durable. This removable acid pouring spout allows for safe pouring of the acid and easy removal of the labware.

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