Put the clean glass instrument in a special cabinet. Clean the filter paper on the partition of the cabinet, close the cabinet door to prevent dust, and do not cover the glass instrument with gauze.
 
It should be kept separately according to the characteristics, uses, and experimental requirements of various glass instruments.
 
⑴ Pipettes can be placed in covered enamel trays and boxes, pads to clean filter paper;
 
⑵The burette can be placed on the titration rack upside down, or filled with distilled water, an upper mouth plus a finger tube or a small beaker. The burette (inner test solution) in use should also be covered during operation suspension to prevent contamination;
 
(3) Clean cuvettes, colorimetric tubes, and centrifuge tubes should be stored in a special box or inverted on a special rack lined with filter paper;
 
的 Clean glass instruments such as measuring bottles, weighing bottles, iodine measuring bottles, reagent bottles, etc. with grinding stoppers must be lined with paper and stored;
 
⑸All glass instruments with matching plugs and caps, such as pycnometers, weighing bottles, measuring bottles, separatory funnels, colorimetric tubes, burettes, etc. must be kept in their original sets and must not be dismantled for use and storage;
 
⑹ Special combined instruments such as Kjeldahl nitrogen determination instrument, K-D evaporation concentrator, rotary evaporation concentrator, etc. should be covered with dust after washing.