The aim of this study was evaluation the effective of chelating
solutions 17% EDTA, 0.2% Chitosan and 10% Sodium citrate by
comparing the concentrations of chelated calcium ions after
(1min-5min-24h) of application. The study was performed on 45
extracted single-rooted sound human. The sample was randomly
divided into groups (n=3), each group 15 teeth that depend on the
used solution.
Pollution by heavy metals, due to their toxic nature and other adverse
effects, is one of the most serious environmental problems. Many heavy metal
ions, such as mercuric ions are detected in industrial wastewaters originating
from metal plating,
mining activities, paint manufacture, etc. This ion isn’t
biodegradable and tends to accumulate in living organisms, causing various
diseases and disorders. Therefore, it should be removed from aqueous solution
before discharge.
During the last decades a large area of irrigated lands in Syria has been
shifted from extensive cropping to intensive agriculture. Many kinds of soils
became incapable to supply high yield crops by their micronutrients
requirements. Therefore, th
e deficiency of Zn, B, Mn and Fe was mentioned in
this soil. Humic substances influence micronutrients availability through
chelating, which can either increase or decrease the availability of the
micronutrients (MN). In this framework, two pot experiments were carried out
in a greenhouse at the University of Plymouth (2006) to investigate the effect of
a commercial humic substance (HS) on the micronutrients availability of: Fe,
Mn ,Zn & Cu in two composite surface soil samples collected from Vertic
Cambisols ,southwest of Syria & from Dystric Cambisols, southwest of England.
Mixtures of polycarboxylic acids and their salts with sodium
tripolyphosphate and sodium pyrophosphate have been investigated in the
presence of ammonium oxalate and sodium carbonate. Some of these mixtures
demonstrated good chelating power synerg
y and some mixures inhibited the
chelating power of the individual components from which the mixures
composed of. The chelating power synergy of some mixtures can be used for
enhancing the function of the builders and consequently decrease the weight of
the detergent meanwhile the inhibition of the chelating power in the other
mixtures can be used for precipitating their components in the treated water in
optimum conditions. It is worth to mention that the chelating powers of sodium
tripolyphsphate and citric acid increased as many as 3-88 times by changing
some experimental conditions.
