4. Objective
Determination
of element N,
P, K, Mg & B
Provide
nutrient for
healthy plant
growth
To check
specification
of elements
by company
Determination
of the moisture
content
7. Add 10 mL
of HCl and 5
mL of Nitric
Acid
Digestion
Cool the
samples for
5 minutes
Add distilled
water until
the volume
of beaker
200mL
Transfer into
the 500mL of
volumetric
flask
filter
Keep the
plastic
vial in
the tray
8. 1. Weigh 10 g
of raw
material into
the dish
2. Place the
dish into the
oven for 2
hours at 103°C
3. Cool in the
desiccator
(10 minutes)
4. Weigh
again and
record the
reading
5. Repeat step
2 until 4 for 2
times
6. Dispose
the
sample
Determination of moisture content
13. Percent by weight
=
𝑊1 − 𝑊2 x 100
𝑊1
W1 is the weight in g of the
sample taken.
W2 is the weight in g of the
sample after drying to
constant weight.
Sample ID = 327
Sample weight (g) = 10.000
Dish weight (g) = 29.470
Weight (dish + sample) after (g)= 39.076
W1 = 10.000
W2 = 9.606
% =
10.000 − 9.606
10.000
× 100
= 3.94%
EXAMPLE CALCULATION MOISTURE (%)
14. CONCLUSION
ELEMENT FUNCTION
N To assist the growth of trees.
P Important in cell division and
development of new tissue.
K Required in large amounts for proper
growth and reproduction of plants.
Mg Building block of chlorophyll which
makes leaves appear green.
B Role in forming and strengthening cell
walls.