Theory and
methods
The aim of our water project at Ekebyholm was to study
Lake Syningen and its physical-chemical conditions during a year. Sample sites
were chosen with the thought that human influence could seen as possible in the
results. SU1 and SU2 are located upstreams 1 – 0,5 km from the lake. They
are surrounded by fields and pasture. Waste water from private houses higher up
on the hill is filtrated into the ground and it maybe comes later to the river.
I and O are inlet and outlet in the lake. A is an isolated bay in the
southeastern part of Syningen. SD means a site in the river downstreams
Syningen.This small river flows through the outskirts of Rimbo community
passing by the sewege water plant. Just after that we had the last sample
site(S). The following instruments were used in water analyses: pH-meter,
conductivity pen, oxygen meter and the most central, spectrophotometer
(Spectronic-20). The methods used in different analyses are seen in the result
table.
Our partner schools Bogenhofen and Stanborough School have tried to
follow the same plan in the water project. Their equipment did not allow them
to make as accurate measurements in every point as in Ekebyholm. Some of the
parameters must be dropped out from their water study because of the shortage
of equipment. The water samples in Bogenhofen were taken in the river flowing
through the school area (three samples). One sample comes from the pond that
the river opens into in the middle of the school area. Salmon fish is fed up in
this pond. The water study in Stanborough School was done only once. The
samples were taken from a river about 10 km from the school in the area north
of London.
