Page 37 - Feed Lab
P. 37
Suguna Management System Ver 1.0 / SOP / FQL / P1 - 06 Page 1 of 2
6. Laboratory Glassware Cleaning Procedure
FIt is corrosive to equipment. It is rather
SCOPE
difficult to remove completely by rinsing
This standard operational procedure applies to all with water; unknowingly it may enter into
laboratory glassware used during the production the analysis serious analytical errors,
of laboratory reagents and/or the preparation of particularly while determining K, Na or SO
samples. 4
chromic acid mixture not is used.
EQUIPMENT
2. General Laboratory Glassware
FGlassware dishwasher
FObjects that are too large to be washed
FDeionised water purification system effectively in the washer, should be soaked in a
10% detergent (Contra NF or similar) bath.
FLarge capacity drying oven 75 °C
FUse acetone to remove any writing on the
FLarge capacity drying oven 110 °C glassware.
FRinse thoroughly with tap water, ensuring there
COMMON CLEANING AGENTS
are not any particles left on the glassware that
1. Preparation of chromic -acid mixture
may clog the washer.
FIt can be prepared by adding 360 ml of
FLoad in washer so that each piece will be
concentrated H SO with 580 ml cooled
2
4
distilled water in the side ways. After 3 hours washed and rinsed properly and Start the
add 60g of potassium dichromate to this washer.
solution and stir well. Before using it can be FAfter the wash cycle is complete, allow the
made up to 5 litres. glassware to cool and put them in the
appropriate oven.
FChromic acid mixture should not be used till it is
needed for some purposes because: FPut glassware in the 110 °C oven and plastic
ware in the 75°C oven. Glassware that
FIt is dangerous, especially when hot, if
spilled or spattered on skin or clothing. contains rubber seals (i.e. blender jars) should
Prepared by : Approved by :
27 Director - Technical
