Page 43 - Statistics presented by Dr. Sara Ismail Aborass

9/8/2023

∴ At the matching point

Intensity of the color intensity of the
color

In sample tube in standard tube

∈1C1l1 (sample) = ∈2C2l2

(standard)

= ∈2 for the same substance

C2l2
∴ C1 (sample) =

l1
l1 & l2 are the remaining volume in the Nessler's tubes

of the sample and standard, respectively.

Expression of results :Parts per million (ppm), milligrams per
litre (mg/l) or micrograms per milliliter (µg/ml).

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CHEMICAL EXAMINATION

1) NITROGENOUS COMPOUNDS

[A] AMMONIA IN WATER :

* SOURCES AND SIGNIFICANCE :
 Ammonia in drinking water :
Results from treatment processes (chloramine).
⚫ WHO standards, 0.05 mg/l.
⚫ It can be an indicator of unhygienic conditions, and is

produced in the bacterial degradation of urea and
proteins.

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