Silkworm
A Treatise on the Acid Treatment of Silkworm Eggs - Central ...
A Treatise on the Acid Treatment of Silkworm Eggs - Central ...
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Preparation of formalin solution :<br />
Formalin under saturation is available al40/" while commercial grade formalin contains 36 to 38%<br />
formaldehyde. Formalin dilution to required levels is conducted by adopting any of the two lollowing<br />
procedures :<br />
a) No. of parts of waterto be added for each part of formalin :<br />
Original Concentration of formalin - Required Concentration<br />
Concentration required<br />
Example : To prepare 2% formalin solution where orginal concentration of formalin is 36%<br />
=36-2 = 34 =1:17<br />
22<br />
i.e. one part of formalin has to be mixed with 17 parts of water<br />
Thus, lor 1 litre = 1000 = 55.55 ml. of {ormalin + 944.45 ml. of water have to be mixed.<br />
(1 7+1)<br />
b) To prepare desired volume of formalin of required strength:<br />
Concentration of formalin required x Volume required in ml<br />
Original concentration o{ f ormalin<br />
lf the above mentioned example is worked out i.e. one litre of 2o/"lormalin from 36% concentrated<br />
formalin<br />
=2x1000 = 2000 = 55.55 rnl<br />
36 36<br />
To this 55.55 ml. of formalin, water is added to make-up to the desired volume of one litre i.e.,<br />
55.55 ml. of formalin + 944.45 ml. of water or 55 ml formaline and 945 ml. of water<br />
13