The Necessity and Procedures for Chemical Cleaning of Laboratory Instruments and Procedures

2016-01-28 09:31:00

肖盈

Original

1979

Summary : When do chemical experiments, cleanliness normative and equipment operation are two important conditions, if there is residual chemical equipment, other experiments will produce irreversible effects, chemical cleaning is necessary, both to avoid different experiments cross-contamination material

When do chemical experiments, cleanliness normative and equipment operation are two important conditions, if there is residual chemical equipment, other experiments will produce irreversible effects, chemical cleaning is necessary, both to avoid different experiments cross-contamination material, but also protect the equipment. Proceed as follows:

1. Caustic: add a small amount of phosphate with an aqueous surfactant formulated cleaning, to remove the oil, silicates and loose dirt floor.
2. Water Rinse: Rinse off the step lye, PH was lowered to 8-10.
3. Pickling: hydrochloric acid, nitric acid or other acids, plus aqueous corrosion inhibitor, circulating cleaning system, the equipment surface dirt completely removed.
4. Water Rinse: Rinse out the residual acid on the step, pH was raised to 4-5.
5. Neutralizing: with 0.1% sodium hydroxide and 0.05% trisodium phosphate, completely neutralize acid remaining in the equipment, and to promote the device surface to form a stable protective film.
6. Passivation: The device surface passivation agent after pickling passivation, does not corrode. Common passivation agents are sodium nitrite, trisodium phosphate and the like.
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