manual of methods of analysis of foods - Ministry of Health and ...
manual of methods of analysis of foods - Ministry of Health and ...
manual of methods of analysis of foods - Ministry of Health and ...
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METALS<br />
remoisten it as mentioned above. Connect tube by means <strong>of</strong> a rubber<br />
stopper, glass tube <strong>and</strong> rubber sleeve to bent capillary tubing (7 mm<br />
outer diameter, 2 mm inner diameter) tapered at the end to slide easily<br />
into connecting tube <strong>and</strong> later into neck <strong>of</strong> 25 ml volumetric flask.<br />
Other end <strong>of</strong> capillary is sealed to pyrex st<strong>and</strong>ard taper 19/38 female<br />
joint. To transfer contents <strong>of</strong> trap, attach bulb aspirator to male<br />
st<strong>and</strong>ard taper 19/38 joint <strong>and</strong> place it in the tip <strong>of</strong> the trap. Clean<br />
traps between determinations without removing beads by flushing<br />
with water followed by nitric acid until nitric acid becomes colourless.<br />
Remove every trace <strong>of</strong> acid with water, rinse with acetone <strong>and</strong> dry<br />
with air current applied by suction to tip <strong>of</strong> traps use<br />
(ii)<br />
Spectrophotometer to read absorbance at 845 nm.<br />
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