EXPERIMENT - DOC by fjhuangjun

VIEWS: 1,519 PAGES: 3

									TO DETECT THE PRESENCE OF ADULTRANTS IN FAT, OIL AND BUTTER:-


     EXPERIMENT                     OBSERVATION                    INFERENCE

1. Adulteration of
vegetable ghee in desi
ghee:

Add 1 ml of HCl and 2-3         Appearance of red colour     Vegetable ghee present
drops of furfural to the test
tube containing desi ghee.

2. Adulteration of
paraffin wax and
hydrocarbon in
vegetable ghee:

Heat small amount of            Appearance of oil floating
vegetable ghee with acetic                                   Paraffin wax present
                                on the surface
anhydride.


3. Adulteration of dyes
in fat:

Heat 1 ml of fat with a         Appearance of pink or red    Dye present in fat
mixture of 1 ml of conc.        colour
H2SO4 and 4 ml of acetic
acid.


4. Adulteration of
argemone oil in edible
oils:

Add few drops of conc.          Appearance of red colour in Argemone oil present
HNO3 and shake.                 the acid layer




                                             (I)
TO DETECT THE PRESENCE OF ADULTRANTS IN SUGAR:-



     EXPERIMENT                     OBSERVATION                   INFERENCE

1. Adulteration of various
insoluble substances in
sugar:

In a test tube take small       Pure sugar dissolves,        No impurities found.
amount of sugar and shake it    whereas impurities do not.
with little water.


2. Adulteration of chalk
powder, washing soda in
sugar:
                                                             Absence of chalk power,
To a small amount of sugar in   No appearance of Brisk
                                                             washing soda
a test-tube, add few drops of   effervescence
dil. HCl.




                                       (II)
 TO DETECT THE PRESENCE OF ADULTRANTS IN SAMPLES OF CHILLI
 POWDER, TURMERIC POWDER AND PEPPER:-

EXPERIMENT                        OBSERVATION                   INFERENCE

1. Adulteration of red
lead salts in chilli
powder:

To a sample of chilli powder Yellow precipitate.          Presence of lead salts in
add dil. HNO3. Filter the                                 chilli powder.
solution and add 2 drops of
potassium iodide solution
to the filtrate.

2. Adulteration of
yellow lead salts to
turmeric powder:

To a sample of turmeric       Appearance of magenta       Presence of yellow oxides
powder add conc. HCl          colour                      of lead in turmeric powder.


3. Adulteration of brick
powder in red chilli:

Add small amount of given     Brick powder settles at     Presence of brick powder
red chilli powder in beaker   bottom, whereas chilli
containing water.             powder floats over water.




                                        (III)

								
To top