The examination of the water's quality can be done on
two different ways:
The rapid tests are very simple and generally used, so in
what follows we will go through them. The most simple, but the most
inexact rapid tests are the test strips.
If we need data very exactly and we have enough time we can
make the biggest part of the measuring in the laboratory (analytical and
We can do the easy examination on the spot with rapid tests,
but these measurments are not very exact.
There are three types of test
The qualitative test strips have got little sheets which
contain a reagent which shows the concentration by changing of the paper's
colour. These test-papers can be used for measuring: pH, the distribution
of the water in the butter, Fe2+,
visual test strips
photometrial test strips
The visual test-strips are similar to the photometrial
test-strips. The photometrial test-stips are more exactly, but they need
spectrophotometer for measuring. The visual tests present one or more zone
with reagent, buffer, masking substances and other auxiliaries. They
are used according to the "dip, lift out and read" technique. If
we keep the directions for use, the measuring can be quick and successful.
The visual test-strips can be used even in the primary school on the optional
courses of biology and chemistry.