MAINTENANCE OF GLASS WARES
Clean glass wares are important in any analytical work
for reliable result. Normally glass wares are kept clean by proper washing.
Therefore selection of appropriate cleansing reagent or methods for glassware
is very essential.
Generally, detergents are used for cleaning up of glass wares. Detergents are a general cleansing reagent in the laboratory. After detergent is applied, it should be followed by rinsing / cleaning with distilled or deionised water. Thereafter you dry in cabinet or oven.
In some occasions or instances where the stains do not respond to detergents, therefore solutions of an oxidising agent should be used, such as chromic acid, 1% potassium manganate II or mixture of HCl and HNO3.
CLEANING REAGENTS FOR SOME LABORATORY STAINS
Cleaning reagents
|
Stains it can remove
|
Chromic acid
|
It is used to remove stains from the walls of
glass wares such as beakers.
It is used in the removal of bacteriological contamination's.
Bloody fluids and Albumen stains
|
Permanganate
mixture
|
Fats and Oils contamination
|
Acidified II
Iron sulphate mixture
|
It used to produce permanganate mixture [KMnO4][dye]
|
Fuming sulphate
acid
|
Stains of stopcock grease silicon base
|
Nitric acid
|
Enzyme contamination
|
H2SO4
|
Stains from Iron
|
Acetone
|
Stains of grease or petroleum grease stains
|
NB: In cases where stains are stubborn, the glass ware can be filled with the solution and left overnight.
Traces
of grease or oil can be removed by rinsing with a small amount of propanol or
acetone.
Solutions
of Alkalis such as NaOH and KOH should be avoided in cleaning volumetric glass
ware
In
all cases, glass wares are rinsed thoroughly with tap water and distilled water
before drying.
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