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Water Quality for a particular sample


A. Indicatorii Fizico-Chimici conf. Hg 1020/2005 (Romanian Government standards for water)
Nr.
crt.
IndicatoriSimbolExprimarea
rezultatului
Limita de
detectie
Concemntratia
maxima
admisa
(CMA)
ValoareComment
1Conc. ionilor de hidrogenpH-0,10-9,00Very mildly alkaline.

Municipal water suppliers often
raise the pH of drinking water
to prevent corrosion of pipes,
often to pH 9, Addy et al. (2004)

Good for growth of
mussels and snails.
2Conductivitate-μS/cm0,50-1536Conductivity is linked directly
to the total dissolved solids (T.D.S.).

High quality deionized water
has a conductivity of about 5.5 μS/m,
typical drinking water is
in the range of 5-50 μS/m,
while sea water is about 51 000 S/m.

This water is not quite brackish,
which is defined as 1600 μS/m.
The desirable range for fish
is 100 - 2000 μS/m Stone et al. (2000)
3CloruriCl- mg/l0,5-41,13This level is low compared to
the level of Sodium in the water,
which in this water sample
is more closely associated
with the level of sulphate radicals.
4SulfatiSO42- mg/l2-236,3This is just below the maximum
allowable level for human drinking water,
and is not a problem for wildlife,
which can tolerate very much higher
(~ 3000 mg/l) levels without adverse effects.
5HidrogencarbonatHCO3-mg/l3-488,1 In freshwater ecology, strong
photosynthetic activity by freshwater
plants in daylight releases
gaseous oxygen into the water
and at the same time produces
bicarbonate ions, which are
a normal component in such waters.
6CalciuCa2+ mg/l0,01-23,95This would be classified as 'hard' water.
Calcium is a dietary requirement for most organisms.
Calcium carbonate is a building stone of
skeletons of most marine organisms,
and eye lenses. Calcium phosphate is required
for bone structure and teeth structure of terrestrial organisms.
Calcium is largely responsible for water hardness,
and may decrease toxicity of other compounds.
Elements such as copper, lead and zinc
are much more toxic in soft water.
Consequently, hard water better protects fishes
from direct deleterious metal uptake.
7MagneziuMg2+ mg/l0,01-5,30Calcium and magnesium are essential to fish
for metabolic reactions such as bone
and scale formation.
8SodiuNa+ mg/l0,01-264,40 This level of Sodium is not a problem in
a fresh water ecology situation.
9PotasiuK+ mg/l0,01-3,29 This level of Potassium is within
normal levels for drinking water
10Fier totalFemg/l0,001-13,18 Iron is an important water quality variable
in the growth of fish. It is a dissolved
nutrient required in small quantities
by both aquatic plants and animals.
11Reziduu secRFmg/l0,01-1240 Residual dry matter after testing,
presumably organic matter.
12Oxigen dizolvatO2mg/l3-10,37 This is an excellent result, and shows
that the water contains the maximum
possible level of dissolved oxygen,
a good indicator of
the excellent health of the ecosystem.
13Dioxid de carbon liberCO2mg/l3- < 3 This is an excellent result, and shows
that the water contains undetectable
levels of dissolved carbon dioxide,
a good indicator of
the excellent health of the ecosystem.
13Hidrogen sulfuratH2Smg/l0,05-< 0,05 This is an excellent result, and shows
that the water contains undetectable
levels of dissolved hydrogen sulfide, or rotten egg gas,
a good indicator of
the excellent health of the ecosystem.

References

  • Addy K., Green L., Herron E., 2004: pH and Alkalinity, University of Rhode Island Watershed Watch, Cooperative Extension College of the Environment and Life Sciences (CELS) Department of Natural Resources Science (NRS) Coastal Institute in Kingston, 1 Greenhouse Road, Kingston, Rhode Island 02881-0804, http://www.uri.edu/ce/wq/ww/Publications/pH&alkalinity.pdf
  • Stone N., Thomforde H., 2000: Understanding Your Fish Pond Water Analysis Report, Cooperative Aquaculture/Fisheries Extension Program, University of Arkansas at Pine Bluff, http://www.extension.org/sites/default/files/w/8/8b/Understanding_Your_Fish_Pond_Water_Analysis_Report.pdf